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Possible explanation of the Lambda-shape anomaly in polymer surface diffusion
Debashish Mukherji1, Martin H Müser
1Department of Physics & Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada.
Abstract:
We suggest an explanation for the anomalous behavior of the polymer surface-diffusion coefficient D reported by Zhao and Granick [J. Am. Chem. Soc. 126, 6242 (2004)]: D first increased with increasing polymer surface concentration Gamma, then suddenly dropped at a threshold value Gamma*. Our molecular dynamics simulations show the same behavior. We find that polymers form single-layered pancake structures for Gamma
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