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Modelling and simulations of adhesion between carbon nanotubes and surfaces

Recent experiments showed that there are very strong adhesion forces between nanotubes and surfaces. These forces are much stronger than the adhesion forces of gecko's foot hairs on substrates. Thus, nanotubes become candidates to be used in dry adhesives. Here, we present theoretical investigations on the adhesion between nanotubes and graphite surfaces. Molecular dynamics simulations and energy minimisation calculations were performed. Layer-by-layer deformations of the nanotube tips were observed. Parallel and perpendicular components of the forces were calculated for different contact angles of nanotubes. Adhesion forces are found to be maximised at 15° impact angles of nanotubes with respect to surface normal.