Diffusive Dynamics of Chainlike Molecules on Surfaces

摘要

The dynamics of polymers on solid surfaces is an interesting theoretical problem211u001ethat has important applications related to thin films. Compared to efforts aimed 211u001eat studying dynamics of polymers in 3D, the 2D case has been explored much less. 211u001eThe aim of this Thesis is to study the dynamic properties of polymers on surfaces 211u001eas represented by simplified models of chainlike molecules. In particular, we 211u001econcentrate on the tracer and collective diffusion coefficients D(T) D(C) 211u001erespectively. These quantities are defined in the hydrodynamical limit of long 211u001etimes and large length scales, which presents a major computational challenge due 211u001eto the lack of self-averaging. To make these calculations possible we have 211u001edeveloped two new methods to calculate diffusion coefficients. In the dynamical 211u001emean field theory dynamic correlations are neglected.