uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Stretchable wireless power transfer with a liquid alloy coil
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, Microsystems Technology. Huazhong Univ Sci & Technol, State Key Lab Digital Equipment & Mfg, Wuhan, Peoples R China.
2015 (English)In: Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on, 2015, 1137-1140 p.Conference 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.

Place, publisher, year, edition, pages
2015. 1137-1140 p.
, Proceedings IEEE Micro Electro Mechanical Systems, ISSN 1084-6999
Keyword [en]
Liquid alloy, Stretchable electronics, Wireless power transfer, Smart system integration
National Category
Engineering and Technology
Research subject
Materials Science
URN: urn:nbn:se:uu:diva-265529DOI: 10.1109/MEMSYS.2015.7051165ISI: 000370382900296ISBN: 978-1-4799-7955-4OAI: oai:DiVA.org:uu-265529DiVA: diva2:866110
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
In thesis
1. Soft Intelligence: Liquids Matter in Compliant Microsystems
Open this publication in new window or tab >>Soft Intelligence: Liquids Matter in Compliant Microsystems
2016 (English)Doctoral 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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 93 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1357
Liquid, Elastomer, Cross-linking, Liquid alloy, PDMS, Adaptability, Compliance, Interface, Patterning, Printing, Surface energy, Wetting, Composite, Modulus, Stretchability, Viscoelasticity, Thermal conductivity, Contact resistance, Adhesion, Packaging, Integration, Microsystems, Microfluidics, Strain sensor, Thermoelectrics, Inductive coupling, Wireless communication, Stretchable electron-ics, Epidermal electronics, Skin electronics, Soft robotics, Wearable electronics
National Category
Composite Science and Engineering Textile, Rubber and Polymeric Materials Energy Engineering Other Engineering and Technologies not elsewhere specified Embedded Systems Robotics
Research subject
Engineering Science with specialization in Microsystems Technology; Engineering Science with specialization in Materials Science
urn:nbn:se:uu:diva-281281 (URN)978-91-554-9521-3 (ISBN)
Public defence
2016-05-11, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Available from: 2016-04-19 Created: 2016-03-21 Last updated: 2016-04-21

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Jeong, Seung HeeWu, Zhigang
By organisation
Microsystems Technology
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 384 hits
ReferencesLink to record
Permanent link

Direct link