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Polymer diffusion on surfaces

PolymerThe lateral diffusion coefficient for strongly adsorbed mono-dispersed polymer/oligomer chains shows an anomalous behavior, which is a result of structural transition from single to double layer. The transition gives polymer more geometrical flexibility to adopt to the surface corrugation and hence, within the Arrhenius type activation picture, is responsible for much reduced lateral mobility at large concentrations. The study showed, that it is also important to adress the aging effects (non-equilibrium dynamics). A distinct reduction in mobility is observed, at all surface coverages, for the system with increasing ages.