Nano Science and Technology Institute
Nanotech 2009 Vol. 3
Nanotech 2009 Vol. 3
Nanotechnology 2009: Biofuels, Renewable Energy, Coatings, Fluidics and Compact Modeling
Chapter 5: Modeling and Simulation of Micro and Nano Systems

Dynamic change in water meniscus arising from tapping of an AFM tip

Authors:S.D. Hong, H.J. Choi, M.Y. Ha, J. Jang
Affilation:Pusan National University, KR
Pages:296 - 299
Keywords:AFM, water meniscus, molecular dynamics, hysteresis
Abstract:We perform a molecular dynamics simulation to emulate the retraction followed by re-approach of an AFM with respect to a surface. We found a hysteresis in the snap-off distance and energy during such a tapping process of AFM tip. As the tip initially retracts from the surface, the meniscus gradually thins out and eventually snaps off. The meniscus keeps its symmetric shape during all stages of the retraction. On the other hand, as the tip re-approaches the surface, the water meniscus is initially asymmetric in shape but finally recovers its symmetry. The distance for the reformation of meniscus is about 4 nm shorter than the snap-off distance during tip retraction. Hysteresis also exists in the behavior of energy vs. tip-surface distance.
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