Advanced Materials
Advanced Materials
5 years ago

Adsorbed Eutectic GaIn Structures on a Neoprene Foam for Stretchable MRI Coils

Adsorbed Eutectic GaIn Structures on a Neoprene Foam for Stretchable MRI Coils
Andreas Mehmann, Matija Varga, Klaas Paul Pruessmann, Gerhard Tröster, Josip Marjanovic, Christian Vogt, Jonas Reber
Stretchable conductors based on eutectic gallium–indium (eGaIn) alloy are patterned on a polychloroprene substrate (neoprene foam) using stencil printing. By tuning the amount of eGaIn on the neoprene substrate, different strain-sensitivity of electrical resistance is achieved. Conductors with a layer of eGaIn, which adsorbs to the walls of 60–100 µm wide neoprene cells, change their electrical resistance for 5% at 100% strain. When the amount of eGaIn is increased, the cells are filled with eGaIn and the strain-sensitivity of the electrical resistance rises to 300% at 100% strain. The developed conductors are patterned as stretchable on-body coils for receiving magnetic signals in a clinical magnetic resonance imaging setup. First images with a stretchable coil are acquired on an orange and compared to the images that are recorded using a rigid copper coil of the same size. Stretchable conductors based on eutectic gallium–indium (eGaIn) alloy are fabricated on a substrate with a microstructured surface (neoprene foam). By varying the amount of the eGaIn alloy during stencil-printing, the strain sensitivity of electrical resistance is tuned from 5% to 300% at 100% strain. The developed conductors are used to fabricate stretchable on-body coils for magnetic resonance imaging.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201703744

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