Sticky elstomer composites for microfluidic stretchable sensor patches
2015 (English)Conference proceedings (editor) (Refereed)
Epidermal electronics and soft robotics are harnessing the advantages of the adaptable and compliantsoft contacts of soft materials. Soft materials can conformally match the morphology of the contact surfaces, which isthe vital point in the implementation of epidermal sensors or soft actuators (S. Xu et al., Soft Microfluidic Assemblies ofSensors, Circuits, and Radios for the Skin, Science, 2014, 344, 70-74). Unfortunately, this conformality can suffer fromdelamination or air trapping at the interface during contact movement. Here, adhesion of soft material surfaces is thecritical parameter. For example, an epidermal sensor on human internal organs and skin, or soft-robotic fingers forgrabbing or climbing needs proper adhesion to its targeted contact surface. Mechanical softness of elastomermaterials provides a good ensemble with surface adhesion because the conformal contact of the soft materials assiststhe adhesion on the target surfaces. Alas, when the soft device is thicker, with its inherent adhesion its compliancemay not suffice but an adhesive layer is needed to ensure good contact.Sticky surfaces of soft materials will significantly help to improve adhesion on target surfaces by preventing sliding.Therefore, more reliable immobilization and manipulation of contacted objects can be secured. Physical and chemicaladhesion forces of the soft material surfaces can be utilized for this purpose. We have developed a sticky elastomercomposite based on PDMS, which has a tape-like adhesive surface after curing. This sticky elastomer composite isstretchable and compliant. The processability of it is compatible with PDMS processes for microfluidic stretchabledevices. It can be easily shaped with laminating, spinning and casting before curing. And, it is reusable several timeswithout leaving residues on the adhered surfaces after detaching and its adhesive strength is tunable with differentmixing ratios with the additive.The sticky elastomer composite showed high enough adhesion to secure attachment on human skin and to lift smallobjects with different surface roughness. Here, soft fingers lifting masses which have different surface morphologieswere tested to verify the compatibility of adhesion force on various surface conditions for soft-robotic manipulationapplication. To show the easy and robust implementation, the sticky elastomer composite is demonstrated with astretchable sensor patch that can be secured to human skin, using much of our recently developed pamphlet ofprocessing technologies (Z.G. Wu, K. Hjort, S.H. Jeong, Microfluidic Stretchable Radio Frequency Devices,Proceedings of the IEEE, 2015, 99, 1-15). Such sensor patches may be suitable as wireless sensor nodes inepidermal body area networks for fitness and healthcare monitoring.
Place, publisher, year, edition, pages
Cambridge University Press, 2015.
functional polymer, adhesion, mechanical stretchability, softness, stretchable sensor
Textile, Rubber and Polymeric Materials
Research subject Materials Science
IdentifiersURN: urn:nbn:se:uu:diva-265526OAI: oai:DiVA.org:uu-265526DiVA: diva2:866108
MRS Fall, Boston, November 29-December 4, 2015