Abstract
This work investigated the basic adhesion mechanisms of biomimetic elastomeric nanostructures using molecular dynamics simulation. The model based on a network of beads in the form of a specifically shaped pillar interacting with a flat substrate has demonstrated to capture the directionality of adhesion and the geometric asymmetry. The simulation results showed an excellent match with the experimental results of similar systems. Our results have explained the mechanisms behind strong adhesion and easy detachment. The stress concentration occurring when the displacement is imposed in the opposite direction to the angle of pillar tilt allows easy detachment as an unzipping effect. We have also found that by switching the angle of displacement one can increase or decrease the overall adhesion strength 4-folds or more. This work has potential implications for creating uniquely designed micro or nano-structures with desired attachment and detachment properties.
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