The experimental and molecular dynamics investigation of shear resistance in ionic liquids at zwitterionic surfaces

The investigation of shear resistance of ionic liquids (ILs) on solid surfaces represents a significant scientific challenge in the advancement of slippery liquid infused porous surfaces (SLIPS). This study systematically examines the shear resistance and underlying mechanisms at the interface between the ILs and zwitterionic surface under shear load, employing a combination of molecular dynamics (MD) simulations and experimental methodologies. Shear resistance assessments were performed utilizing a spin coater at varying rotational velocities, and an MD model comprising over 6000 atoms was developed to explore the bonding force of ILs and solids. Experimental findings reveal that the shear resistance of the IL samples at the interface markedly exceeds that of conventional SLIPS. The MD results reveal that the electrostatic force, estimated at around -600 kcal·mol −1 , between the zwitterionic surface and the ILs plays a crucial role in enhancing the adhesion of the ILs to the substrate.