Controlling C2C12 Cytotoxicity on Liquid Metal Embedded Elastomer (LMEE)

Liquid metal embedded elastomers (LMEEs) are highly stretchable composites comprising microscopic droplets of eutectic gallium-indium (EGaIn) liquid metal embedded in a soft rubber matrix. They have a unique combination of mechanical, electrical, and thermal properties that make them attractive for potential applications in flexible electronics, thermal management, wearable computing, and soft robotics. However, the use of LMEEs in direct contact with human tissue or organs requires an understanding of their biocompatibility and cell cytotoxicity. In this study, the cytotoxicity of C2C12 cells in contact with LMEE composites composed of EGaIn droplets embedded with a polydimethylsiloxane (PDMS) matrix is investigated. In particular, the influence of EGaIn volume ratio and shear mixing time during synthesis on cell proliferation and viability is examined. The special case of electrically-conductive LMEE composites in which a percolating network of EGaIn droplets is created through mechanical sintering is also examined. This study in C2C12 cytotoxicity represents a first step in determining whether LMEE is safe for use in implantable biomedical devices and biohybrid systems.

Automated summary

Liquid metal embedded elastomers (LMEEs) are stretchable composites with unique properties that make them appealing for flexible electronics and soft robotics. This study investigates the biocompatibility and cell cytotoxicity of LMEE composites in contact with C2C12 cells. The influence of EGaIn volume ratio and synthesis parameters on cell proliferation and viability is examined, as well as the case of electrically-conductive LMEE composites.