Controlling C2C12 Cytotoxicity on Liquid Metal Embedded Elastomer (LMEE)

Area of Science:

• Materials Science
• Biocompatibility Studies
• Nanotechnology

Background:

• Liquid metal embedded elastomers (LMEEs) are advanced composite materials combining liquid metal (eutectic gallium-indium, EGaIn) droplets within a flexible polymer matrix (polydimethylsiloxane, PDMS).
• Their unique mechanical, electrical, and thermal properties offer potential in flexible electronics, soft robotics, and wearable devices.
• Assessing the biocompatibility of LMEEs is crucial for their translation into biomedical applications, particularly for direct tissue or organ contact.

Purpose of the Study:

• To investigate the cytotoxicity of LMEE composites on C2C12 cells.
• To determine how EGaIn volume fraction and synthesis parameters (shear mixing time) affect cell viability and proliferation.
• To evaluate the cytotoxicity of electrically conductive LMEEs formed via "mechanical sintering".

Main Methods:

• Cytotoxicity assays were performed using C2C12 cells cultured in direct contact with LMEE samples.
• LMEE composites were synthesized with varying EGaIn volume ratios and shear mixing durations.
• The influence of "mechanical sintering" on creating conductive networks and its effect on cytotoxicity was examined.

Main Results:

• The study systematically evaluated the impact of EGaIn content and mixing parameters on C2C12 cell responses.
• Specific findings regarding cell proliferation and viability in relation to LMEE composition are detailed.
• The cytotoxicity of conductive LMEEs, achieved through mechanical sintering, was also assessed.

Conclusions:

• This research provides initial data on the biocompatibility of EGaIn-based LMEEs with C2C12 cells.
• The findings contribute to understanding the safety profile of LMEEs for potential use in implantable biomedical devices.
• Further studies are warranted to fully establish the safety and efficacy of LMEEs in biohybrid systems.