Diffusive Spreading of Chainlike Molecules on Surfaces

Preprint

16 April 1996

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9604097

Abstract

We study the diffusion and submonolayer spreading of chainlike molecules on surfaces. Using the fluctuating bond model we extract the collective and tracer diffusion coefficients D_c and D_t with a variety of methods. We show that D_c(theta) has unusual behavior as a function of the coverage theta. It first increases but after a maximum goes to zero as theta go to one. We show that the increase is due to entropic repulsion that leads to steep density profiles for spreading droplets seen in experiments. We also develop an analytic model for D_c(theta) which agrees well with the simulations.

Keywords

BEHAVIOR AS A FUNCTION
DIFFUSION COEFFICIENTS
SPREADING OF CHAINLIKE
MOLECULES ON SURFACES
DIFFUSIVE SPREADING
CHAINLIKE MOLECULES
ANALYTIC MODEL
D_C

All Related Versions

Version 1, 1996-04-16, ArXiv
Published version: Physical Review Letters, 76 (21), 4003.

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