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  • 151.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Wettability control and superhydrophobicity on diamond2010Conference paper (Refereed)
  • 152.
    Forsberg, Pontus S. H.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Priest, Craig
    Brinkmann, Martin
    Sedev, Rossen
    Ralston, John
    Contact Line Pinning on Microstructured Surfaces for Liquids in the Wenzel State2010In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 2, p. 860-865Article in journal (Refereed)
    Abstract [en]

    The wettability of surfaces microstructured with square pillars was studied, where the static advancing contact angle on the planar surface was 72 degrees. We observed elevated advancing angles (up to 140 degrees) on these structures for droplets in the Wenzel state. No air was trapped in the structured surf ices beneath the liquid, ruling out the well-known Lotus leaf effect. Instead, we show that the apparent hydrophobicity is related to contact line pinning at the pillar edges, giving a strong dependence of wetting hysteresis oil the fraction of the contact line pinned on pillars. Simulating the contact line pinning oil these Surfaces showed similar behavior to our measurements, revealing both strong pinning at the edges of the pillars as well as mechanistic details.

  • 153.
    Fromell, Karin
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Clinical Immunology.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Larsson, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Baltzer, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Physical Organic Chemistry.
    Designed protein binders in combination with nanocrystalline diamond for use in high-sensitivity biosensors2012In: Analytical and Bioanalytical Chemistry, ISSN 1618-2642, E-ISSN 1618-2650, Vol. 404, no 6-7, p. 1643-1651Article in journal (Refereed)
    Abstract [en]

    A platform for diagnostic applications showing signal-to-noise ratios that by far surpass those of traditional bioanalytical test formats has been developed. It combines the properties of modified nanocrystalline diamond (NCD) surfaces and those of polyethylene oxide and polypropylene oxide based block copolymers for surface passivation and binder conjugation with a new class of synthetic binders for proteins. The NCD surfaces were fluorine-, hydrogen-, or oxygen-terminated prior to further biofunctionalization and the surface composition was characterized by X-ray photoelectron spectroscopy. In a proof of principle demonstration targeting the C-reactive protein, an ELISA carried out using an F-terminated diamond surface showed a signal-to-noise ratio of 3,900 which compares well to the signal-to-noise of 89 obtained in an antibody-based ELISA on a polystyrene microtiter plate, a standard test format used in most life science laboratories today. The increase in signal-to-noise ratio is to a large extent the result of extremely efficient passivation of the diamond surface. The results suggest that significant improvements can be obtained in standardized test formats using new materials in combination with new types of chemical coatings and receptor molecules.

  • 154.
    Gallinetti, Sara
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Universitat Politècnica de Cataluny; Barcelona Research Center in Multiscale Science and Engineering, UPC, Barcelona, Spain .
    Mestres, Gemma
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Canal, Cristina
    Universitat Politècnica de Catalunya; Barcelona Research Center in Multiscale Science and Engineering.
    Persson, Cecilia
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Ginebra, Maria-Pau
    Universitat Politècnica de Catalunya; Barcelona Research Center in Multiscale Science and Engineering.
    A novel strategy to enhance interfacial adhesion in fiber-reinforced calcium phosphate cement2017In: Journal of The Mechanical Behavior of Biomedical Materials, ISSN 1751-6161, E-ISSN 1878-0180, Vol. 75, p. 495-503Article in journal (Refereed)
    Abstract [en]

    Calcium phosphate cements (CPCs) are extensively used as synthetic bone grafts, but their poor toughness limits their use to non-load-bearing applications. Reinforcement through introduction of fibers and yarns has been evaluated in various studies but always resulted in a decrease in elastic modulus or bending strength when compared to the CPC matrix. The aim of the present work was to improve the interfacial adhesion between fibers and matrix to obtain tougher biocompatible fiber-reinforced calcium phosphate cements (FRCPCs). This was done by adding a polymer solution to the matrix, with chemical affinity to the reinforcing chitosan fibers, namely trimethyl chitosan (TMC). The improved wettability and chemical affinity of the chitosan fibers with the TMC in the liquid phase led to an enhancement of the interfacial adhesion. This resulted in an increase of the work of fracture (several hundred-fold increase), while the elastic modulus and bending strength were maintained similar to the materials without additives. Additionally the TMC-modified CPCs showed suitable biocompatibility with an osteoblastic cell line.

  • 155.
    Gonska, Nathalie
    et al.
    Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    Robinson, Nathaniel
    Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden.
    Barbe, Laurent
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Tenje, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Johansson, Jan
    Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.
    Artificial spider silk production on a microfluidic chip2018Conference paper (Other academic)
  • 156.
    Grandfield, Kathryn
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Palmquist, Anders
    Institute for Clinical Sciences, Dept of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Göteborg.
    Ericsson, Fredric
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Malmström, Johan
    Institute for Clinical Sciences, Dept of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Göteborg.
    Emanuelsson, Lena
    Institute for Clinical Sciences, Dept of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Göteborg.
    Slotte, Christer
    Institute for Clinical Sciences, Dept of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Göteborg och Dept of Periodontology, The Institute for Postgraduate Dental Education, Jönköping.
    Adolfsson, Erik
    Swedish Ceramic Institute, IVF, Mölndal.
    Botton, Gianluigi A.
    Dept of Materials Science and Engineering, McMasters Unviersity, Hamilton, ON, Kanada.
    Thomsen, Peter
    Institute for Clinical Sciences, Dept of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Göteborg.
    Engqvist, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Bone response to free form fabricated hydroxyapatite and zirconia scaffolds: a transmission electron microscopy study in the human maxilla2012In: Clinical Implant Dentistry and Related Research, ISSN 1523-0899, E-ISSN 1708-8208, Vol. 14, no 3, p. 461-469Article in journal (Refereed)
    Abstract [en]

    Background: Understanding the interfacial reactions to synthetic bone regenerative scaffolds in vivo is fundamental for improving osseointegration and osteogenesis. Using transmission electron microscopy, it is possible to study the biological response of hydroxyapatite (HA) and zirconia (ZrO2) scaffolds at the nanometer scale.

    Purpose: In this study, the bone-bonding abilities of HA and ZrO2 scaffolds produced by free-form fabrication were evaluated in the human maxilla at 3 months and 7 months.

    Materials and Methods: HA and ZrO2 scaffolds (ø: 3 mm) were implanted in the human maxilla, removed with surrounding bone, embedded in resin, and sectioned. A novel focused ion beam (FIB) sample preparation technique enabled the production of thin lamellae for study by scanning transmission electron microscopy.

    Results: Interface regions were investigated using high-angle annular dark-field imaging and energy-dispersive X-ray spectroscopy analysis. Interfacial apatite layers of 80 nm and 50 nm thickness were noted in the 3- and 7-month HA samples, respectively, and bone growth was discovered in micropores up to 10 µm into the samples.

    Conclusions: The absence of an interfacial layer in the ZrO2 samples suggest the formation of a direct contact with bone, while HA, which bonds through an apatite layer, shows indications of resorption with increasing implantation time. This study demonstrates the potential of HA and ZrO2 scaffolds for use as bone regenerative materials.

  • 157. Gurgurewicz, Joanna
    et al.
    Mège, Daniel
    Grygorczuk, Jerzy
    Wiśniewski, Łukasz
    Berglund, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Carrère, Véronique
    Gritsevich, Maria
    Kalarus, Maciej
    Peltoniemi, Jouni
    Persson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rataj, Mirosław
    Thornell, Greger
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Wawer, Piotr
    Zubko, Nataliya
    Studying the composition of Phobos' surface using HOPTER (Highland Terrain Hopper)2016Conference paper (Refereed)
  • 158.
    Hagman, Anton
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Print and roll: A technique for rapid production of stretchable liquid alloy circuits2010Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Liquid alloy circuitry is an exciting new field of research. It is one of the technologies that strives to make a commercial production of reliable, stretchable circuits possible. The making of liquid alloy circuits is, today, a somewhat tedious handicraft that is time-consuming and not suited for mass production. In this diploma thesis a new method to produce liquid alloy circuitry is presented; print and roll. The circuits consists of Galinstan paths embedded in polydimethylsiloxane (PDMS). Conductive paths are printed in a two step sequence on semi-cured PDMS and then covered with uncured PDMS and exposed to a final curing step. Print and roll produces circuits that are of equal quality as the circuits made with the old method, with a speed and ease superior to the old method. Furthermore advantages and disadvantages with printing on partly cured PDMS substrates are discussed. Partly cured PDMS substrates is important for the print and roll process since it enables the use of uncured PDMS to cover the printed circuit. Using uncured PDMS as a cover-material makes it possible to print the circuits on flat substrates and to use a pick and place machine to place components on the circuit-paths. Some tests with pick and place placing of both large and small components were conducted with varying results.

  • 159. Halldin, Sven
    et al.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Nyberg, Lars
    Centre for Natural Disaster Science: Interdisciplinary cooperation to predict, mitigate, and prevent natural disasters2010In: 1st Nat. Symp. on Technol. and Methodology for Security and Crisis Management, 2010Conference paper (Other (popular science, discussion, etc.))
  • 160.
    Halvarsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology, Ångström Space Technology Centre (ÅSTC).
    Ett kommunikationssystem för fiberoptisk överföring av bilddata förvärvad av en miniatyriserad undervattensfarkost2011Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes the development and implementation of a system for transmitting digital information at high speeds from a miniaturized submersible developed by the Ångström Space Technology Centre at Uppsala University. For instance, the vehicle shall transmit image data – even stream live video - through an optical fibre to a monitor in a ground station. Hence, the system shall be used both to convert the image data to make it transmittable, and to recreate it at the receiver.

    The work includes a pre-study of the programming language and the technology used. A concept for the solution is presented together with main components later broken down into internal functions. Following on this, other components that were necessary for fulfilling the function of the main components were identified. The system was developed with the hardware description language VHDL in order to be implementable and testable on an FPGA platform, but also to be transferable to other devices.

    After the development and implementation on the hardware platform, the system was tested and verified. Analysis showed that some modifications were required to produce the desired results. These modifications implied some deviations from the assignment statement but gave rise to suggestions for further improvement of the concept. All in all, however, the solution was successfully verified since the transmitted data was possible to recreate the original image.

    The report contains drawings of the developed system and the source code it consists of.

  • 161.
    Hamberg, Mathias
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Ögren, Jim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, FREIA. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Kuittinen, M.
    Institute of Photonics, University of Eastern Finland, Finland.
    Vartiainen, I.
    Institute of Photonics, University of Eastern Finland, Finland.
    Dielectric Laser Acceleration Setup Design, Grating Manufacturing and Investigations Into Laser Induced RF Cavity Breakdowns2017In: Proceedings of FEL2017, Santa Fe, NM, USA, 2017Conference paper (Refereed)
  • 162. Han, Hoang Van
    et al.
    Hoa, N. D.
    Tong, P. V.
    Nguyen, Hugo
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hieu, N. V.
    Single-crystal zinc oxide nanorods with nanovoids as highly sensitive NO2 nanosensors2013In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 94, p. 41-43Article in journal (Refereed)
    Abstract [en]

    Design and synthesis of nanostructured materials with a highly porous crystal structure and high specific surface area are the key issues to an enhanced gas sensing performance. This letter introduces a simple and scalable hydrothermal method to fabricate single-crystal ZnO nanorods (NRs) with nanovoids (NVs) for highly sensitive NO2 nanosensors. The fabricated ZnO NRs have a single-crystal structure with an average length and diameter of about 900 nm and 23 nm, respectively. NVs of less than 5 nm size are found frequently along the NRs. Gas-sensing characterizations revealed that the ZnO NR sensors exhibited a relatively high response to sub-ppm NO2 with excellent stability after 8 cycles of switching from NO2 to dry air without significant response reduction.

  • 163.
    Hasan, Saad A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Tsekoura, Eleni K.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Sternhagen, Victoria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Strømme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Evolution of the Composition and Suspension Performance of Nitrogen-Doped Graphene2012In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 116, no 11, p. 6530-6536Article in journal (Refereed)
    Abstract [en]

    Nitrogen functionalization of graphene enables it to be used for catalysis and targeted adsorption of biomolecules in both the solid state and in suspension. Thus, we sought to characterize the functional groups and suspension charge behavior of nitrogen-doped graphene (NDG) prepared in the absence of hydrazine, a highly toxic reagent. The hydrothermal reaction of graphite oxide (GO) with ammonia was shown to effectively remove oxygen and to restore the graphitic framework within the resulting NDG sheets. The enhanced graphitic character of the NDG materials was verified using X-ray photoelectron spectroscopy, thermogravimetic analysis, and electrical conductivity measurements. With six hours of reaction time (sample NDG-6), up to 9.6 wt % (7.1 atomic %) of nitrogen could be introduced into the graphene. All the NDG materials exhibited excellent dispersibility in water allowing their surface charge to be probed by measuring zeta potential (zeta) as a function of suspension pH. The NDG-6 material could hold surface charge ranging from zeta = -50 mV to zeta = +20 mV, which is, to the best of our knowledge, the widest range of surface charges measured on a colloidal graphene material.

  • 164.
    Hedlund, E.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Westerberg, L.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Malyshev, O. B.
    Leandersson, M.
    Fridén, C-J.
    Uppsala University, The Svedberg Laboratory.
    Edqvist, E.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kollmus, H.
    Bellachioma, M. C.
    Reich-Sprenger, H.
    Krasnov, A.
    A new test stand for heavy ion induced gas desorption measurements at TSL2008In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 586, no 3, p. 377-381Article in journal (Refereed)
    Abstract [en]

    In several experiments at CERN, GSI and BNL it has been found that the lifetime of highly energetic heavy ions in synchrotrons decreases with increasing number of injected ions. This phenomenon occurs due to the collisions of beam ions and residual gas molecules leading to the change of charge of the ions and their loss on the vacuum chamber walls, which in turn cause ion-induced gas desorption and further pressure increase. To gain a deeper understanding of the ion-induced desorption process in the energy range 5-45 MeV/u, a dedicated test stand was built at the end of the K beamline at The Svedberg Laboratory (TSL) in Uppsala, Sweden. The energy range was chosen due to the fact that the injection energy of the heavy ion synchrotron SIS18 at GSI will be 10 MeV/u, and that there are insufficient data in this energy range. A Test Particle Monte-Carlo model of the experimental set-up was build-up, run and analysed for different sample configurations. An important result is that for the same sample material the desorption yield from a flat sample causes a 1.58 times larger pressure increase than that of a tubular sample. A detailed explanation of the set-up is presented.

  • 165.
    Hillered, Lars
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Dahlin, Andreas P
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Clausen, Fredrik
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Chu, Jiangtao
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Bergquist, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Enblad, Per
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Lewén, Anders
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Cerebral microdialysis for protein biomarker monitoring in the neurointensive care setting - a technical approach2014In: Frontiers in Neurology, ISSN 1664-2295, E-ISSN 1664-2295, Vol. 5, p. 245-Article in journal (Refereed)
    Abstract [en]

    Cerebral microdialysis (MD) was introduced as a neurochemical monitoring method in the early 1990s and is currently widely used for the sampling of low molecular weight molecules, signaling energy crisis, and cellular distress in the neurointensive care (NIC) setting. There is a growing interest in MD for harvesting of intracerebral protein biomarkers of secondary injury mechanisms in acute traumatic and neurovascular brain injury in the NIC community. The initial enthusiasm over the opportunity to sample protein biomarkers with high molecular weight cut-off MD catheters has dampened somewhat with the emerging realization of inherent methodological problems including protein-protein interaction, protein adhesion, and biofouling, causing an unstable in vivo performance (i.e., fluid recovery and extraction efficiency) of the MD catheter. This review will focus on the results of a multidisciplinary collaborative effort, within the Uppsala Berzelii Centre for Neurodiagnostics during the past several years, to study the features of the complex process of high molecular weight cut-off MD for protein biomarkers. This research has led to new methodology showing robust in vivo performance with optimized fluid recovery and improved extraction efficiency, allowing for more accurate biomarker monitoring. In combination with evolving analytical methodology allowing for multiplex biomarker analysis in ultra-small MD samples, a new opportunity opens up for high-resolution temporal mapping of secondary injury cascades, such as neuroinflammation and other cell injury reactions directly in the injured human brain. Such data may provide an important basis for improved characterization of complex injuries, e.g., traumatic and neurovascular brain injury, and help in defining targets and treatment windows for neuroprotective drug development.

  • 166.
    Hillered, Lars
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Dahlin, Andreas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.
    Purins, Karlis
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Wetterhall, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.
    Bergquist, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Enblad, Per
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    Lewen, Anders
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Neurosurgery.
    New Microdialysis Method for Protein Biomarker Sampling in the Neurointensive Care Setting2014In: Journal of Neurotrauma, ISSN 0897-7151, E-ISSN 1557-9042, Vol. 31, no 5, p. A22-A22Article in journal (Refereed)
  • 167.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Fluidic circuitboard technology2010In: Int Sci Conf on Microfluidics in Bioanalytical Res and Diagnostics, 2010, p. 24-Conference paper (Refereed)
  • 168.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    High-pressure microfluidics2015Conference paper (Refereed)
  • 169.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    High-pressure microfluidics2017Conference paper (Refereed)
    Abstract [en]

    When using appropriate materials and microfabrication techniques, with the small dimensions the mechanical stability of microstructured devices allows for processes at high pressures without loss in safety. The largest area of applications has been demonstrated in green chemistry and bioprocesses, where extraction, synthesis and analyses often excel at high densities and high temperatures, which are accessible through high pressures. Capillary chemistry has been used since long but, just like in low-pressure applications, there are several potential advantages in using microfluidic platforms, e.g., planar isothermal set-ups, large local variations in geometries, dense form factors, small dead volumes and precisely positioned microstructures for control of reactions, catalysis, mixing and separation. Other potential applications are in, e.g., microhydraulics, exploration, gas driven vehicles, and high-pressure science. From a short review of the state-of-art and frontiers of high pressure microfluidics, the focus will be on our different solutions demonstrated for microfluidic handling at high pressures and challenges that remain.

  • 170.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Microsystems for the good life2018In: Int. Summit Forum on Micro and Nano Manipul. and Manufact.: MNMM 2018, 2018, p. 5-5Conference paper (Other academic)
    Abstract [en]

    The Microsystems Technology Division of Uppsala University is committed to make microsystems for the good life. I will present our research on novel materials and technologies for miniaturized systems that are for the good of society and can provide fundamental answers in science.

  • 171.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Printed circuit board microsystems for wireless sensor nodes2012In: 19th Micromachine Summit (MMS2013, April 21-24, 2013, Shanghai, China), 2012Conference paper (Other academic)
  • 172.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Stretchable Microfluidic RF Electronics for Biopatches2016In: 17th International Symposium on RF-MEMS and RF-microsystems (MEMSWAVE 2016), 2016, Vol. 17, p. 8-8Conference paper (Refereed)
    Abstract [en]

    Silicone based compliant and unobtrusive wireless sensor nodes on the skin, so called biopatches or biostamps, have good potential to revolutionize precision medicine.

    In much, their promise comes from being unobtrusive in similar manner as contact lenses are compared to eye-glasses. Also, they have intrinsic advantages in their compliancy and direct contact to the body in applications like physical sensors for biomechanical readout, sweat biomarker sensors, optically based non-invasive sensors for various blood stream data, and planar electrophysiological arrays.[i]

    Our group initiated the use of liquid alloys for stretchable RF-electronics.[ii] The primary objective was to provide large cross-sections with high compliancy for low resistance also in larger areas and components needed in high quality RF-circuits. In addition, the liquid alloy provided a sliding contact to the embedded modules and with that contact robust against large strains. Most recently, we have introduced a very compliant and adhesive PDMS elastomer (named S3-PDMS for soft, stretchable and sticky PDMS), which not only allows for better contact to the skin but also increases the adhesion between the embedded modules and the elastomer.[iii] With these improvements, we now believe that it is possible to make also thicker biopatches unobtrusive, allowing for reusable gadgets, and circuits and devices which demand more volume. At the moment we are investigating how such biopatches should be used in biomechanical medicine. Our technology development is built on batch-wise printed circuit board production with good prospects for medium-sized series. However, to truly revolutionize the precision of precision medicine, the continuous sensoric feedback that supports the medical treatment should be tailored for each person’s needs. Hence, we aim for serial production of very small customized series of sensors as prescribed by your doctor.

    [i] T.Q. Trung and N.-E. Lee, Flexible and Stretchable Physical Sensor Integrated Platforms for Wearable Human-Activity Monitoring and Personal Healthcare, Adv. Mater. 2016, DOI: 10.1002/adma.201504244; Rugged and breathable forms of stretchable electronics with adherent composites for transcutaneous monitoring, Nature Commun. 2014, 5, 4779; W. Gao, S. Emaminejad, H.Y.Y. Nyein, S. Challa, K. Chen, A. Peck, H.M. Fahad, H. Ota, H. Shiraki, D. Kiriya, D.-H. Lien, G.A. Brooks, R.W. Davis, and A. Javey, Fully integrated wearable sensor arrays for multiplexed in situ perspiration analysis, Nature 2016, doi:10.1038/nature16521; H. Lee, T.K. Choi, Y.B. Lee, H.R. Cho, R.Ghaffari, L.Wang, H.J. Choi, T.D.Chung, N.Lu, T. Hyeon, S.H. Choi, and D.-H. Kim, A graphene-based electrochemical device with thermoresponsive microneedles for diabetes monitoring and therapy, Nature Nanotechnology 2016, doi:10.1038/nnano.2016.38 .

    [ii] S. Cheng, A. Rydberg, K. Hjort and Z. G. Wu, Liquid metal stretchable unbalanced loop antenna, Appl. Phys. Lett. 2009, 94, 144103; Z.G. Wu, K. Hjort, and S.H. Jeong, Microfluidic stretchable radio frequency devices, Proc. IEEE 2015, 103, 1211-1225.

    [iii] S.H. Jeong, S. Zhang, K. Hjort, Z.G. Wu, Sticky elastomer composite for microfluidic stretchable sensor patches, 2015 MRS Fall Meeting (Nov. 29-Dec. 4, 2015, Boston, MA) B12.04.; S. Jeong, Soft Intelligence - Liquid Matters in Compliant Microsystems, 2016, Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1357, urn:nbn:se:uu:diva-281281

  • 173.
    Hjort, Klas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Halldin, Sven
    WSN and hydrological natural disasters, Wireless Sensors and Sensor Systems in Emerging Hostile Applications2012In: European Microwave Week 2012 (Oct. 28 – Nov. 2, 2012, Amsterdam, The Netherlands), 2012, p. W01-Conference paper (Other academic)
  • 174.
    Hjort, Klas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Jensen, J.
    Sanz, R.
    Skupinski, M.
    Jonsson, A.
    Boman, M.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    The use of swift heavy ions for nanolithography2007Conference paper (Refereed)
  • 175.
    Hjort, Klas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Rask-Andersen, Helge
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Otolaryngology and Head and Neck Surgery.
    Li, Hao
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Otolaryngology and Head and Neck Surgery.
    Softer, thinner and more compliant implants2018Conference paper (Refereed)
    Abstract [en]

    Tissue irritation is caused by two main reasons – chemical and mechanical. In recent years, material chemical biocompatibility has been much improved but most implants used in soft tissue still have low compliance. This is especially severe in the brain, where the tissue often has a compliance of a soft hydrogel and ordinary silicone materials like PDMS have an elastic modulus up to 1,000 times higher, i.e. like a wooden stick irritating your skin. Starting from the remaining challenges of the highly successful Cochlear Implants and recent work on stretchable electronics this review conclude on the merits with soft stretchable printed circuitboards, with components of fluids, gels, and sprinkled with a smart dust of small chips.

  • 176.
    Hjort, Klas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Schweitz, Jan-Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Micromachining in bulk GaAs1990In: Sensors and materials, ISSN 0914-4935, Vol. 2, p. 1-Article in journal (Refereed)
  • 177.
    Hjort, Klas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Söderkvist, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    The Piezoelectric Effect of GaAs Used for Resonant Sensors and Actuators1993In: Transducers'93, 1993, p. 650-653Conference paper (Refereed)
  • 178.
    Hjort, Klas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Wu, Zhigang
    Huazhong University of Science and Technology.
    Microfluidic mixing and separation2016In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 26, no 1, article id 010402Article in journal (Refereed)
  • 179.
    Hjälm Wallborg, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Palmgren, Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Improving engine oil coolerperformance: For future vehicle applications2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes the process of improving the engine oil cooler performance for future vehicle applications, from ideas to simulated concepts. Increasing market expectations of high engine power, low fuel consumption and high towing capabilities results in an ever rising pressure on the cooling system in modern cars.

    The desire to prevent a future situation where the engine oil could become too hot, formed the basis for this thesis. The thesis was performed during 10 weeks from March to June 2015, at Volvo Car Corporation in Gothenburg.

    The working process started with literary studies where the theory behind automotive cooling systems and heat exchangers were studied to increase the general knowledge about the theory. Studies of engine oil, heat transfer and the overall design of engine cooling systems were performed.

    An important part was to clarify why the oil must not exceed a certain temperature limit. This gave answers to how the oil and engine components would be affected, if the oil did exceed the set temperature limit.

    To get a clear target and measurable parameters, the goal of this thesis was defined by estimating what the heat transfer demands could be in the future.

    A competitor analysis was made to examine how and if, the competitors to VCC use a different kind of oil cooling.

    Generation of concept ideas were made continuously during the early stage of the work process. Concepts that proved to be interesting were analysed more deeply with performance simulations and packaging studies.

    Five concepts were analysed and the performance simulations indicated that all the presented concepts can reach the heat transfer goal set early in the process. They do however use different methods, and meet the goal with different levels of efficiency. All concepts are listed with their heat transfer performance results and their advantages and disadvantages.

    The concept that showed to be the most promising in an oil cooling perspective, was to connect an additional heat exchanger in series after the current plate heat exchanger. This is a solution which will support the current engine oil cooler by handling the additional heat produced during certain driving scenarios. The best concept reached a heat transfer rate of 40 kW at half the air flow required by the second best concept. The concepts that has been presented will implicate an alteration of the current oil cooling system design. The lack of available space in the cars will also result in some rearranging of components in order to make space for an additional heat exchanger.

    The purpose with the concept generation is to present a good foundation from which Volvo can base their future decisions on.

  • 180. Hoa, Nguyen Thi Quynh
    et al.
    Lam, Phan Huu
    Tung, Phan Duy
    Tuan, Tran Sy
    Nguyen, Hugo
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Numerical Study of a Wide-Angle and Polarization-Insensitive Ultrabroadband Metamaterial Absorber in Visible and Near-Infrared Region2019In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 11, no 1, article id 4600208Article in journal (Refereed)
    Abstract [en]

    An ultrabroadband metamaterial absorber structure based on a periodic array of metallic-dielectric multilayered conical frustums is numerically investigated and proposed. The metamaterial absorber indicated an absorptivity of higher than 90%, which covered the visible and near-infrared region at 480-1480 nm, and a relative absorption bandwidth of 102%. The high absorptivity can be maintained with large incident angles up to 60 degrees under both transverse electric and transverse magnetic polarizations. Furthermore, the proposed absorber exhibits polarization insensitivity owing to its rotational symmetry structure. Compared with the previously reported ultrabroadband metamaterial absorbers, the design in this work indicates high practical feasibility in terms of a compact structure for a large bandwidth, a wide incident angle, and polarization insensitivity, thereby suggesting its promising application, for example, in solar cells and thermal emitters.

  • 181.
    Hoshian, S.
    et al.
    Aalto University.
    Jokinen, V.
    Aalto University.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Ras, R.H.A.
    Aalto University.
    Franssila, S.
    Aalto University.
    Fast reversible photo-switching from Cassie to Wenzel wetting states using a microhoodoo-structured surface2014Conference paper (Other academic)
  • 182. Hoshian, S
    et al.
    Jokinen, Ville
    Li, Juan
    Ras, R.H.A.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Franssila, Samuli
    Atomic layer deposition of TiO2 for reversibly switchable hydrophobic surfaces2013In: 24th Micromachine Europe, 2013, p. P32-Conference paper (Other academic)
  • 183. Hoshian, Sasha
    et al.
    Jokinen, Ville
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Ras, Robin H. A.
    Franssila, Sami
    Amplified and Localized Photoswitching of TiO2 by Micro- and Nanostructuring2015In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 28, p. 15593-15599Article in journal (Refereed)
    Abstract [en]

    Fast photoswitching of wetting properties is important for the development of micro/nanofluidic systems and lab-on-a-chip devices. Here, we show how structuring the surface amplifies photoswitching properties. Atomic layer-deposited titanium dioxide (TiO2) has phototunable hydrophilic properties due to its surface chemistry, but microscale overhang pillars and additional nanoscale topography can override the chemistry and make the surface sup erhydrophobic. Three switching processes are achieved simply by controlling the UV exposure time: from (1) rolling superhydrophobic to sticky superhydrophobic (Cassie-Baxter to Wenzel), (2) sup erhydrophobic to hydrophilic, and (3) superhydrophobic to superhydrophilic after 1, 5, and 10 min of UV exposure, respectively. We report the fastest reversible switching to date: 1 min of UV exposure is enough to promote a rolling-to-sticky transition, and mild heating (30 min at 60 degrees C) is sufficient for recovery. This performance is caused by a combination of the photoswitching properties of TiO2, the micropillar overhang geometry, and surface nanostructuring. We demonstrate that the switching also can be performed locally by introducing microwriting under a water droplet.

  • 184.
    Hou, Zining
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    An, Yu
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hjort, Karin
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Sandegren, Linus
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Time lapse investigation of antibiotic susceptibility using a microfluidic linear gradient 3D culture device2014In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 14, no 17, p. 3409-3418Article in journal (Refereed)
    Abstract [en]

    This study reports a novel approach to quantitatively investigate the antibacterial effect of antibiotics on bacteria using a three-dimensional microfluidic culture device. In particular, our approach is suitable for studying the pharmacodynamics effects of antibiotics on bacterial cells temporally and with a continuous range of concentrations in a single experiment. The responses of bacterial cells to a linear concentration gradient of antibiotics were observed using time-lapse photography, by encapsulating bacterial cells in an agarose-based gel located in a commercially available microfluidics chamber. This approach generates dynamic information with high resolution, in a single operation, e. g., growth curves and antibiotic pharmacodynamics, in a well-controlled environment. No pre-labelling of the cells is needed and therefore any bacterial sample can be tested in this setup. It also provides static information comparable to that of standard techniques for measuring minimum inhibitory concentration (MIC). Five antibiotics with different mechanisms were analysed against wild-type Escherichia coli, Staphylococcus aureus and Salmonella Typhimurium. The entire process, including data analysis, took 2.5-4 h and from the same analysis, high-resolution growth curves were obtained. As a proof of principle, a pharmacodynamic model of streptomycin against Salmonella Typhimurium was built based on the maximal effect model, which agreed well with the experimental results. Our approach has the potential to be a simple and flexible solution to study responding behaviours of microbial cells under different selection pressures both temporally and in a range of concentrations.

  • 185.
    Hultqvist, Adam
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Platzer-Björkman, Charlotte
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Coronel, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Edoff, Marika
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Experimental investigation of Cu(In1-x,Ga-x)Se-2/Zn(O1-z,S-z) solar cell performance2011In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 95, no 2, p. 497-503Article in journal (Refereed)
    Abstract [en]

    In this study we investigate the performance of Cu(In1-x,Ga-x)Se-2/Zn(O1-z,S-z) solar cells by changing the gallium content of the absorber layer in steps from CuInSe2 to CuGaSe2 and at each step vary the sulfur content of the Zn(O,S) buffer layer. By incorporating more or less sulfur into the Zn(O,S) buffer layer it is possible to change its morphology and band gap energy. Surprisingly, the best solar cells with Zn(O,S) buffer layers in this study are found for close to or the same Zn(O,S) buffer layer composition for all absorber Ga compositions. In comparison to their CdS references the best solar cells with Zn(O,S) buffer layers have slightly lower open circuit voltage, V-oc, lower fill factor, FF, and higher short circuit current density, J(sc), which result in comparable or slightly lower conversion efficiencies. The exception to this trend is the CuGaSe2 solar cells, where the best devices with Zn(O,S) have substantially lowered efficiency compared with the CdS reference, because of lower V-oc, FF and J(sc). X-ray photon spectroscopy and X-ray diffraction measurements show that the best Zn(O,S) buffer layers have similar properties independent of the Ga content. In addition, energy dispersive spectroscopy scans in a transmission electron microscope show evidence of lateral variations in the Zn(O,S) buffer layer composition at the absorber/buffer layer interface. Finally, a hypothesis based on the results of the buffer layer analysis is suggested in order to explain the solar cell parameters.

  • 186.
    Hägglund, Victor
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Maskmaterial för djupets avborosilikatglas2013Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The objective of this thesis was to establish a good way of wet etching a borosilicate glass named Borofloat 33 for bonding microfluidic devices. This was accomplished by wet etching with different materials as masking layers and evaluating them in different concentrations of the main etchant, which is the hydrofluoric acid (HF). The best results were obtained with a mask consisting of evaporated chromium and gold, where gold was sequentially deposited to minimize the occurrence of pinholes generated in the glass substrate. The Cr/Au mask was successfully able to protect the glass, while etching to the predefined depth of 90 micrometer, and at the same time keeping the amount of pinholes at an acceptable level. Deep and precise etching in Borofloat was possible due to an increasing knowledge about how different masking materials behave in different etching solutions as well as how the etch rate in Borofloat depends on the HF concentration. Static simulations were carried out in order to determine a beneficial design of processed micro channels for resisting internal pressure as well as optical inspection of the fluids inside the channels.

  • 187.
    Ismail Eriksson, Daniel
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Utveckling av tuning-krets för långpulsmodulator: Framtagning av prototyp2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes the development of a tuning circuit prototype for a long pulse

    modulator as well as its mechanical design. The prototype has been developed for

    ScandiNova Systems AB in Uppsala, which develops and produces solid-state

    modulators. The tuning circuit's main purpose is to minimize voltage drop in the

    electrical pulses generated by the modulator.

    The work began with a pilot study in which computer simulations were used to

    determine the electrical quantities of the tuning circuit's components. Practical tests

    and calculations were also carried out at this stage to determine the suitable

    components to purchase. The electrical components were bought and new tests

    were made to verify their effectiveness.

    After the pilot study, concept generation regarding the tuning circuit's mechanical

    design were conducted together with the R & D department using the method

    brainstorming. Following each consecutive brainstorming session, one or more CAD

    models were designed and then presented at the next brainstorming session. Finally a

    CAD prototype complete with drawings were presented and approved by the R & D

    department and sent out for manufacturing.

    Further work on the prototype should be aimed at performing realistic tests and

    designing the bobbin for manufacturing, alternatively finding a suitable bobbin for

    purchase.

  • 188. Jaafar, M.
    et al.
    Sanz, R.
    Vazquez, M.
    Asenjo, A.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Flohrer, S.
    Schäfer, R.
    FePt thin film irradiated with high energy ions2007In: Physica status solidi. A, Applied research, ISSN 0031-8965, E-ISSN 1521-396X, Vol. 204, no 6, p. 1724-1730Article in journal (Refereed)
    Abstract [en]

    The changes in structural and magnetic properties of FePt thin films due to the irradiation with high energy ions (Br7+ and Cl2+) were studied. From the hysteresis loops dominating in-plane anisotropy is derived, however, the samples present a minor out-of-plane component. The structure and the magnetic properties of the films can be tuned by selecting the appropriate irradiation parameters (different ions, energies and fluencies). For the irradiation parameters used in this study an in-plane anisotropy is favoured. Irradiation with Br7+ seems to induce minor changes in the structural ordering of the thin films, whereas the Cl2+ ions promote the amorphization of the surface of the films. In addition, a magnetic thin film pattemed at the micrometer scale was obtained after irradiation through a micrometric mask.

  • 189. Janhunen, P.
    et al.
    Toivanen, P. K.
    Polkko, J.
    Merikallio, S.
    Salminen, P.
    Haeggstrom, E.
    Seppänen, H.
    Kurppa, R.
    Ukkonen, J.
    Kiprich, S.
    Thornell, Greger
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kratz, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Richter, L.
    Krömer, O.
    Rosta, R.
    Noorma, M.
    Envall, J.
    Lätt, S.
    Mengali, G.
    Quarta, A. A.
    Koivisto, H.
    Tarvainen, O.
    Kalvas, T.
    Kauppinen, J.
    Nuottajärvi, A.
    Obraztsov, A.
    Invited Article: Electric solar wind sail: Toward test missions2010In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 81, no 11, p. 111301-Article in journal (Refereed)
    Abstract [en]

    The electric solar wind sail (E-sail) is a space propulsion concept that uses the natural solar wind dynamic pressure for producing spacecraft thrust. In its baseline form, the E-sail consists of a number of long, thin, conducting, and centrifugally stretched tethers, which are kept in a high positive potential by an onboard electron gun. The concept gains its efficiency from the fact that the effective sail area, i.e., the potential structure of the tethers, can be millions of times larger than the physical area of the thin tethers wires, which offsets the fact that the dynamic pressure of the solar wind is very weak. Indeed, according to the most recent published estimates, an E-sail of 1 N thrust and 100 kg mass could be built in the rather near future, providing a revolutionary level of propulsive performance (specific acceleration) for travel in the solar system. Here we give a review of the ongoing technical development work of the E-sail, covering tether construction, overall mechanical design alternatives, guidance and navigation strategies, and dynamical and orbital simulations.

  • 190. Janhunen, P.
    et al.
    Toivanen, P.K.
    Polkko, J.
    Merikallio, S.
    Salminen, P.
    Haeggström, E.
    Seppänen, H.
    Kurppa, R.
    Ukkonen, J.
    Kiprich, S.
    Thornell, Greger
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kratz, Henrik
    Richter, L.
    Krömer, O.
    Roste, R.
    Noorma, M.
    Envall, J.
    Lätt, S.
    Mengali, G.
    Quarta, A.
    Koivisto, H.
    Tarvainen, O.
    Kalvas, T.
    Kauppinen, J.
    Nuottajärvi, A.
    Obraztsov, A.
    Electric solar wind sail in.scpace propulsion status report2010In: Proceedings of Space Propulsion, 2010, San Sebastian, Spain, May 3-6, 2010, 2010Conference paper (Refereed)
  • 191.
    Janhunen, Pekka
    et al.
    Finnish Meteorological Institute.
    Merikallio, Sini
    Finnish Meteorological Institute.
    Toivanen, Petri
    Finnish Meteorological Institute.
    Polkko, Jouni
    Finnish Meteorological Institute.
    Haeggström, Edward
    University of Helsinki, Department of Physics.
    Seppänen, Henri
    University of Helsinki, Department of Physics.
    Kurppa, Ristp
    University of Helsinki, Department of Physics.
    Ukkonen, Jukka
    University of Helsinki, Department of Physics.
    Ylitalo, Tuomo
    University of Helsinki, Department of Physics.
    Kiprich, Sergiy
    National Science Center Kharkov Institute of Physics and Technology.
    Koivisto, Hannu
    University of Jyväskylä, Accelerator Laboratory.
    Kalvas, Taneli
    University of Jyväskylä, Accelerator Laboratory.
    Tarvainen, Olli
    University of Jyväskylä, Accelerator Laboratory.
    Kauppinen, Janne
    University of Jyväskylä, Accelerator Laboratory.
    Thornell, Greger
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kratz, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Sundqvist, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Grönland, Tor-Arne
    Johansson, Håkan
    Rangsten, Pelle
    Vinterhav, Emil
    Noorma, Mart
    University of Tartu.
    Envall, Jouni
    University of Tartu.
    Lätt, Silver
    University of Tartu.
    Allik, Viljo
    University of Tartu.
    Voormansik, Kaupo
    University of Tartu.
    Kvell, Urmas
    Lebreton, Jean-Pierre
    Hallikainen, Martti
    Aalto University.
    Praks, Jaan
    Aalto University.
    Krömer, Olaf
    Rosta, Roland
    Salminen, Pekka
    Mengali, Giovanni
    University of Pisa.
    Quarta, Alessandro
    University of Pisa.
    Aliasi, Generoso
    University of Pisa.
    Marcuccio, Salvo
    Pergola, Pierpaolo
    Giusti, Nicola
    Electric Solar Wind Sail in tailwind2011In: EPSC-DPS Joint Meeting 2011, 2011Conference paper (Refereed)
    Abstract [en]

    The Electric Solar Wind Sail (E-sail) is a novelpropulsion concept that enables faster space travel tomany solar system targets. E-sail uses charged solarwind particles as the source of its propulsion. This isachieved by deploying long, conducting and chargedtethers, which get pushed by the solar wind byCoulomb drag [1].E-sail technology is being developed to technicalreadiness level (TRL) 4-5 by the European Union’sSeventh Framework Programme for Research andTechnological Development, EU FP7, in a projectnamed ESAIL (http://www.electric-sailing.fi/fp7).Prototypes of the key parts are to be produced. Thedesign will be scalable so that a real solar winddemonstration mission could be scaled up from them.We review here the latest results of the constantlyevolving E-sail project.

  • 192.
    Janhunen, Pekka
    et al.
    Finnish Meteorological Institute.
    Toivanen, Petri
    Finnish Meteorological Institute.
    Merikallio, Sini
    Finnish Meteorological Institute.
    Polkko, Jouni
    Finnish Meteorological Institute.
    Haeggström, Edward
    University of Helsinki, Department of Physics.
    Seppänen, Henri
    University of Helsinki, Department of Physics.
    Kurppa, Risto
    University of Helsinki, Department of Physics.
    Ukkonen, Jukka
    University of Helsinki, Department of Physics.
    Ylitalo, Tuomo
    University of Helsinki, Department of Physics.
    Kiprich, Sergiy
    National Science Center Kharkov Institute of Physics and Technology.
    Koivisto, Hannu
    University of Jyväskylä, Accelerator Laboratory.
    Kalvas, Taneli
    University of Jyväskylä, Accelerator Laboratory.
    Tarvainen, Olli
    University of Jyväskylä, Accelerator Laboratory.
    Kauppinen, Janne
    University of Jyväskylä, Accelerator Laboratory.
    Thornell, Greger
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kratz, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Sundqvist, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Grönland, Tor-Arne
    Johansson, Håkan
    Rangsten, Pelle
    Vinterhav, Emil
    Noorma, Mart
    University of Tartu.
    Envall, Jouni
    University of Tartu.
    Lätt, Silver
    University of Tartu.
    Allik, Viljo
    University of Tartu.
    Voormansik, Kaupo
    University of Tartu.
    Kvell, Urmas
    Lebreton, Jean-Pierre
    Hallikainen, Martti
    Aalto University.
    Praks, Jaan
    Aalto University.
    Krömer, Olaf
    Rosta, Roland
    Salminen, Pekka
    Mengali, Giovanni
    University of Pisa.
    Quarta, Alessandro
    University of Pisa.
    Aliasi, Generoso
    University of Pisa.
    Marcuccio, Salvo
    Pergola, Pierpaolo
    Giusti, Nicola
    Electric Solar Wind Sail Propulsion System Development2011In: International Electric Propulsion Conference, 2011Conference paper (Refereed)
  • 193.
    Jensen, Jens
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics. Avdelningen för jonfysik.
    Johansson, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics.
    Skupinski, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics. Materialvetenskap.
    Surpi, Alessandro
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics. Elektronmikroskopi och Nanoteknologi.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Materialvetenskap.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics. Jonfysik.
    Nanostructuring by heavy ion beam-based lithography2007Conference paper (Refereed)
  • 194.
    Jensen, Jens
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Kubart, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Martin, David
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Surpi, A
    Blom, Tobias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Experimental Physics.
    Topalian, Z
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Yousef, H
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
    Sanz, R
    Damage formation in TiO2 by heavy ions: consequences for micro- and nano-struring2008In: 7th International Symposium on Swift Heavy Ions in Matter (SHIM2008), Lyon, France, 2008Conference paper (Refereed)
  • 195.
    Jensen, Jens
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Sanz, R.
    Skupinski, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hernandez-Velez, M.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Swift heavy ion beam-based nanopatterning using self-assembled masks2007In: Ion-Beam-Based Nanofabrication / [ed] Ila D; Baglin J; Kishimoto N; Chu PK, 2007, Vol. 1020, p. 55-60Conference paper (Refereed)
    Abstract [en]

    Swift heavy ion beam-based lithography using masks of self-assembled materials has been applied for transferring well-ordered micro- and nanopatterns to rutile TiO2 single crystals. As the induced damage has a high etching selectivity the patterns can be developed in HF with very high contrast. Here we present resulting patterns when using a mask of self-ordered silica spheres. Since the obtained structures are replicas of the mass distribution of the applied mask, the shape and size of resulting structures depend on the geometric configuration of the silica sphere layers. In addition, the resulting pattern can be tuned by varying the applied ion energy and fluence. Direct modifications of the optical properties of TiO2 in a well-defined pattern are also presented.

  • 196.
    Jensen, Jens
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Sanz, Ruy
    Skupinski, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hernandez-Velez, M.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Swift Heavy Ion Beam-Based Nanopatterning Using Self-Assembled Masks2007In: Materials Research Society, Symposium Proceedings Volume 1020: Ion-Beam-Based Nanofabrication, Warrendale, Pa: Materials Research Society , 2007, p. 55-Conference paper (Refereed)
    Abstract [en]

    Swift heavy ion beam-based lithography using masks of self-assembled materials has been applied for transferring well-ordered micro- and nanopatterns to rutile TiO2 single crystals. As the induced damage has a high etching selectivity the patterns can be developed in HF with very high contrast. Here we present resulting patterns when using a mask of self-ordered silica spheres. Since the obtained structures are replicas of the mass distribution of the applied mask, the shape and size of resulting structures depend on the geometric configuration of the silica sphere layers. In addition, the resulting pattern can be tuned by varying the applied ion energy and fluence. Direct modifications of the optical properties of TiO2 in a well-defined pattern are also presented.

  • 197.
    Jensen, Jens
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Skupinski, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Sanz, R.
    Heavy Ion beam-based nano-and micro-structuring of TiO2 single crystals using self-assembled masks2007In: Radiation Effects in Insulators. Proceedings of the Fourteenth International Conference on Radiation Effects in Insulators / [ed] Abdenacer Benyagoub, Lionel Thomé, Marcel Toulemonde and Patrick Trocellier, Elsevier, 2007, p. 3113-3119Conference paper (Refereed)
    Abstract [en]

    Fast heavy ion beam-based lithography using masks of self-assembled materials has been applied for transferring well-ordered nano- and micropatterns to rutile TiO2 single crystals. As the induced damage has a high etching selectivity the patterns can be developed in hydrofluoric acid with very high-contrast. Here we present resulting patterns when using a mask of self-ordered silica spheres. The obtained pattern are replicas of the mass distribution of the mask. In addition the shape and size of the regular structures depend on the applied ion energy and fluence. Direct modifications of the optical properties of TiO2 in a well-defined pattern are also presented.

  • 198.
    Jensen, Jens
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Skupinski, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Sanz, R
    Heavy ion beam-based nano- and micro-structuring of TiO2 single crystals using self-assembled masks2008In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 266, no 12-13, p. 3113-3119Article in journal (Refereed)
    Abstract [en]

    Fast heavy ion beam-based lithography using masks of self-assembled materials has been applied for transferring well-ordered nano- and micropatterns to rutile TiO2 single crystals. As the induced damage has a high etching selectivity the patterns can be developed in hydrofluoric acid with very high-contrast. Here we present resulting patterns when using a mask of self-ordered silica spheres. The obtained pattern are replicas of the mass distribution of the mask. In addition the shape and size of the regular structures depend on the applied ion energy and fluence. Direct modifications of the optical properties of TiO2 in a well-defined pattern are also presented. (c) 2008 Elsevier B.V. All rights reserved.

  • 199.
    Jeong, Seung Hee
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Soft Intelligence: Liquids Matter in Compliant Microsystems2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Soft matter, here, liquids and polymers, have adaptability to a surrounding geometry. They intrinsically have advantageous characteristics from a mechanical perspective, such as flowing and wetting on surrounding surfaces, giving compliant, conformal and deformable behavior. From the behavior of soft matter for heterogeneous surfaces, compliant structures can be engineered as embedded liquid microstructures or patterned liquid microsystems for emerging compliant microsystems.

    Recently, skin electronics and soft robotics have been initiated as potential applications that can provide soft interfaces and interactions for a human-machine interface. To meet the design parameters, developing soft material engineering aimed at tuning material properties and smart processing techniques proper to them are to be highly encouraged. As promising candidates, Ga-based liquid alloys and silicone-based elastomers have been widely applied to proof-of-concept compliant structures.

    In this thesis, the liquid alloy was employed as a soft and stretchable electrical and thermal conductor (resistor), interconnect and filler in an elastomer structure. Printing-based liquid alloy patterning techniques have been developed with a batch-type, parallel processing scheme. As a simple solution, tape transfer masking was combined with a liquid alloy spraying technique, which provides robust processability. Silicone elastomers could be tunable for multi-functional building blocks by liquid or liquid-like soft solid inclusions. The liquid alloy and a polymer additive were introduced to the silicone elastomer by a simple mixing process. Heterogeneous material microstructures in elastomer networks successfully changed mechanical, thermal and surface properties.

    To realize a compliant microsystem, these ideas have in practice been useful in designing and fabricating soft and stretchable systems. Many different designs of the microsystems have been fabricated with the developed techniques and materials, and successfully evaluated under dynamic conditions. The compliant microsystems work as basic components to build up a whole system with soft materials and a processing technology for our emerging society.

    List of papers
    1. Liquid alloy printing of microfluidic stretchable electronics
    Open this publication in new window or tab >>Liquid alloy printing of microfluidic stretchable electronics
    Show others...
    2012 (English)In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 22, no 12, p. 4657-4664Article in journal (Refereed) Published
    Abstract [en]

    Recently, microfluidic stretchable electronics has attracted great interest from academia since conductive liquids allow for larger cross-sections when stretched and hence low resistance at longer lengths. However, as a serial process it has suffered from low throughput, and a parallel processing technology is needed for more complex systems and production at low costs. In this work, we demonstrate such a technology to implement microfluidic electronics by stencil printing of a liquid alloy onto a semi-cured polydimethylsiloxane (PDMS) substrate, assembly of rigid active components, encapsulation by pouring uncured PDMS on-top and subsequent curing. The printing showed resolution of 200 mm and linear resistance increase of the liquid conductors when elongated up to 60%. No significant change of resistance was shown for a circuit with one LED after 1000 times of cycling between a 0% and an elongation of 60% every 2 s. A radio frequency identity (RFID) tag was demonstrated using the developed technology, showing that good performance could be maintained well into the radio frequency (RF) range.

    Place, publisher, year, edition, pages
    Royal society of chemistry, 2012
    Keywords
    liquid alloy, printing, stretchable electronics, wireless communication
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering Other Materials Engineering
    Research subject
    Engineering Science with specialization in Microsystems Technology; Engineering Science with specialization in Electronics
    Identifiers
    urn:nbn:se:uu:diva-183278 (URN)10.1039/C2LC40628D (DOI)000310865200010 ()
    Available from: 2012-10-23 Created: 2012-10-23 Last updated: 2017-12-07Bibliographically approved
    2. Adhesive transfer soft lithography: low-cost and flexible rapid prototyping of microfluidic devices, Micro and Nanosystems
    Open this publication in new window or tab >>Adhesive transfer soft lithography: low-cost and flexible rapid prototyping of microfluidic devices, Micro and Nanosystems
    2014 (English)In: micro and nanosystems, ISSN 1876-4037, Vol. 6, p. 42-49Article in journal (Refereed) Published
    Abstract [en]

    A simple and low-cost approach was proposed for prototyping PDMS based microfluidic devices by transferringadhesive film microstructures onto a flexible substrate as a mould for PDMS replicas. The microstructures were engravedon an adhesive coated film using a commercial cutting plotter and then transferred (or laminated) onto a flexiblesubstrate, allowing for engraved isolated patterns. The proposed technique was demonstrated by a hydrodynamic focusingmicrofluidic device, having splitting and re-combining sheath channels. The whole processing could be finished within 1h in a normal laboratory environment. This approach offers an easy, flexible and rapid prototyping of microfluidic andlab-on-a-chip devices to users without expertise in microfabrication. In addition, by minimizing the use of chemicals, theprocess becomes more environmentally friendly than conventional photolithography based micro-fabrication techniques.

    Place, publisher, year, edition, pages
    Bentham Science Publishers, 2014
    Keywords
    liquid alloy, printing, soft lithography, rapid prototyping
    National Category
    Other Engineering and Technologies
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-239241 (URN)
    Available from: 2014-12-19 Created: 2014-12-19 Last updated: 2016-04-22
    3. Tape Transfer Printing of a Liquid Metal Alloy for Stretchable RF Electronics
    Open this publication in new window or tab >>Tape Transfer Printing of a Liquid Metal Alloy for Stretchable RF Electronics
    2014 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 14, no 9, p. 16311-16321Article in journal (Refereed) Published
    Abstract [en]

    In order to make conductors with large cross sections for low impedance radio frequency (RF) electronics, while still retaining high stretchability, liquid-alloy-based microfluidic stretchable electronics offers stretchable electronic systems the unique opportunity to combine various sensors on our bodies or organs with high-quality wireless communication with the external world (devices/systems), without sacrificing enhanced user comfort. This microfluidic approach, based on printed circuit board technology, allows large area processing of large cross section conductors and robust contacts, which can handle a lot of stretching between the embedded rigid active components and the surrounding system. Although it provides such benefits, further development is needed to realize its potential as a high throughput, cost-effective process technology. In this paper, tape transfer printing is proposed to supply a rapid prototyping batch process at low cost, albeit at a low resolution of 150 mu m. In particular, isolated patterns can be obtained in a simple one-step process. Finally, a stretchable radio frequency identification (RFID) tag is demonstrated. The measured results show the robustness of the hybrid integrated system when the tag is stretched at 50% for 3000 cycles.

    Keywords
    tape transfer printing, liquid metal alloy, microfluidic stretchable electronics, stretchable RF electronics, radio frequency identification (RFID) tag
    National Category
    Electrical Engineering, Electronic Engineering, Information Engineering
    Identifiers
    urn:nbn:se:uu:diva-237588 (URN)10.3390/s140916311 (DOI)000343106600041 ()
    Available from: 2014-12-05 Created: 2014-12-03 Last updated: 2017-12-05Bibliographically approved
    4. Tape transfer atomization patterning of liquid alloys for microfluidic stretchable wireless power transfer
    Open this publication in new window or tab >>Tape transfer atomization patterning of liquid alloys for microfluidic stretchable wireless power transfer
    2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, p. 8419-Article in journal (Refereed) Published
    Abstract [en]

    Stretchable electronics offers unsurpassed mechanical compliance on complex or soft surfaces like the human skin and organs. To fully exploit this great advantage, an autonomous system with a self-powered energy source has been sought for. Here, we present a new technology to pattern liquid alloys on soft substrates, targeting at fabrication of a hybrid-integrated power source in microfluidic stretchable electronics. By atomized spraying of a liquid alloy onto a soft surface with a tape transferred adhesive mask, a universal fabrication process is provided for high quality patterns of liquid conductors in a meter scale. With the developed multilayer fabrication technique, a microfluidic stretchable wireless power transfer device with an integrated LED was demonstrated, which could survive cycling between 0% and 25% strain over 1,000 times.

    National Category
    Mechanical Engineering
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-247504 (URN)10.1038/srep08419 (DOI)000349245600018 ()25673261 (PubMedID)
    Available from: 2015-03-19 Created: 2015-03-19 Last updated: 2017-12-04Bibliographically approved
    5. Stretchable wireless power transfer with a liquid alloy coil
    Open this publication in new window or tab >>Stretchable wireless power transfer with a liquid alloy coil
    2015 (English)In: Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on, 2015, p. 1137-1140Conference paper, Published paper (Refereed)
    Abstract [en]

    An integrated stretchable wireless power transfer device was demonstrated by packaging rigid electronic chips onto a liquid alloy coil patterned on a half-cured polydimethylsiloxane (PDMS) surface. To obtain low enough resistance, the long liquid alloy coil with a large cross section was made with a tape transfer masking followed by spray deposition of the liquid alloy. The measured results indicated the wireless power transfer efficiency reached 10% at 140 kHz and good performance under 25% overall strain. Different sizes of liquid alloy coils and a soft magnetic composite core were tested to improve the efficiency of the system.

    Series
    Proceedings IEEE Micro Electro Mechanical Systems, ISSN 1084-6999
    Keywords
    Liquid alloy, Stretchable electronics, Wireless power transfer, Smart system integration
    National Category
    Engineering and Technology
    Research subject
    Materials Science
    Identifiers
    urn:nbn:se:uu:diva-265529 (URN)10.1109/MEMSYS.2015.7051165 (DOI)000370382900296 ()978-1-4799-7955-4 (ISBN)
    Conference
    Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on, Estoril, January 18-22, 2015
    Available from: 2015-10-31 Created: 2015-10-31 Last updated: 2016-04-21Bibliographically approved
    6. Mechanically Stretchable and Electrically Insulating Thermal Elastomer Composite by Liquid Alloy Droplet Embedment
    Open this publication in new window or tab >>Mechanically Stretchable and Electrically Insulating Thermal Elastomer Composite by Liquid Alloy Droplet Embedment
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    2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, article id 18257Article in journal (Refereed) Published
    Abstract [en]

    Stretchable electronics and soft robotics have shown unsurpassed features, inheriting remarkable functions from stretchable and soft materials. Electrically conductive and mechanically stretchable materials based on composites have been widely studied for stretchable electronics as electrical conductors using various combinations of materials. However, thermally tunable and stretchable materials, which have high potential in soft and stretchable thermal devices as interface or packaging materials, have not been sufficiently studied. Here, a mechanically stretchable and electrically insulating thermal elastomer composite is demonstrated, which can be easily processed for device fabrication. A liquid alloy is embedded as liquid droplet fillers in an elastomer matrix to achieve softness and stretchability. This new elastomer composite is expected useful to enhance thermal response or efficiency of soft and stretchable thermal devices or systems. The thermal elastomer composites demonstrate advantages such as thermal interface and packaging layers with thermal shrink films in transient and steady-state cases and a stretchable temperature sensor.

    National Category
    Textile, Rubber and Polymeric Materials Mechanical Engineering
    Identifiers
    urn:nbn:se:uu:diva-272055 (URN)10.1038/srep18257 (DOI)000366451800001 ()26671673 (PubMedID)
    Funder
    Swedish Research Council, 621-2010-5443 621-2014-5596Swedish Foundation for Strategic Research , EM11-0002 SE13-0061
    Available from: 2016-01-12 Created: 2016-01-11 Last updated: 2017-11-30Bibliographically approved
    7. PDMS-Based Elastomer Tuned Soft, Stretchable, and Sticky for epidermal electronics
    Open this publication in new window or tab >>PDMS-Based Elastomer Tuned Soft, Stretchable, and Sticky for epidermal electronics
    Show others...
    2016 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 28, no 28, p. 5830-5836Article in journal (Refereed) Published
    Abstract [en]

    Targeting good user experiences, softness and stretchability are essential features for epidermal devices in body signal monitoring and body area stimulation. A highly soft, stretchable and sticky polydimethylsiloxane based elastomer (S3-PDMS) is achieved by a simple process with a widely used siloxane precursors, the properties of which are tuned by adding small fractions of an amine-based polymer, ethoxylated polyethylenimine (EPEI). This allows formation of a thick unobstrusive patch and may ease implementation of epidermal electronics in wearable healthcare applications. 

    Keywords
    Adhesion, Compliance, Elongation at break, Epidermal electronics, PDMS-based elastomer tuning
    National Category
    Textile, Rubber and Polymeric Materials Applied Mechanics Polymer Chemistry
    Research subject
    Engineering Science with specialization in Materials Science
    Identifiers
    urn:nbn:se:uu:diva-281212 (URN)10.1002/adma.201505372 (DOI)000382400900004 ()
    Funder
    Swedish Research Council, 2010-5443
    Available from: 2016-03-21 Created: 2016-03-21 Last updated: 2017-11-30Bibliographically approved
    8. Stretchable thermoelectric generators metallized with liquid alloy
    Open this publication in new window or tab >>Stretchable thermoelectric generators metallized with liquid alloy
    Show others...
    2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 18, p. 15791-15797Article in journal (Refereed) Published
    Abstract [en]

    Conventional thermoelectric generators (TEGs) are normally hard, rigid, and flat. However, most objects have curvy surfaces, which require soft and even stretchable TEGs for maximizing efficiency of thermal energy harvesting. Here, soft and stretchable TEGs using conventional rigid Bi2Te3 pellets metallized with a liquid alloy is reported. The fabrication is implemented by means of a tailored layer-by-layer fabrication process. The STEGs exhibit an output power density of 40.6 mu W/cm(2) at room temperature. The STEGs are operational after being mechanically stretched-and-released more than 1000 times, thanks to the compliant contact between the liquid alloy interconnects and the rigid pellets. The demonstrated interconnect scheme will provide a new route to the development of soft and stretchable energy-harvesting avenues for a variety of emerging electronic applications.

    National Category
    Energy Engineering Textile, Rubber and Polymeric Materials Other Engineering and Technologies not elsewhere specified
    Identifiers
    urn:nbn:se:uu:diva-281213 (URN)10.1021/acsami.7b04752 (DOI)000401307100064 ()28453282 (PubMedID)
    Funder
    Swedish Foundation for Strategic Research , EM11-0002, SE13-0061Swedish Research Council, 621-2014-5596
    Available from: 2016-03-21 Created: 2016-03-21 Last updated: 2017-07-04Bibliographically approved
  • 200.
    Jeong, Seung Hee
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Berglund, Albin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Nilsson, ida
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Sahlberg, Arne
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Nguyen, Hugo
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Wu, Zhigang
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    High Resolution Patterning of Liquid Alloy by Shrinking the Substrate2016Conference paper (Refereed)
    Abstract [en]

    In order to overcome the current limitation in the resolution of the previous developed, liquid alloy patterning method, a shrinking substrate is, for the first time, employed. The current printing technique combining spraying a liquid alloy and transferring a tape mask can be processed with a 100 μm level resolution. This is limited by the resolution of a mask fabricated by using a cutting plotter. By shrinking a substrate, a smaller scale of the liquid alloy pattern can be created without changing the current printing process with a tape mask, which has the advantage of quick and easy processing. We have found that the shrinking process by relaxing a radially 200% pre-strained substrate makes to increases twofold in the resolution of the liquid alloy line pattern.

1234567 151 - 200 of 562
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