Diffusive spreading of chainlike molecules on surfaces

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1996
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Ala-Nissilä, Tapio
Herminghaus, Stephan
Hjelt, Tuomo
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Physical Review Letters ; 76 (1996), 21. - pp. 4003-4006
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 Dc and Dt with a variety of methods. We show that Dc(O) has unusual behavior as a function of the coverage O. It first increases, but after a maximum goes to zero as O -> 1. 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 Dc(O) which agrees well with the simulations.
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530 Physics
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ISO 690ALA-NISSILĂ„, Tapio, Stephan HERMINGHAUS, Tuomo HJELT, Paul LEIDERER, 1996. Diffusive spreading of chainlike molecules on surfaces. In: Physical Review Letters. 76(21), pp. 4003-4006. Available under: doi: 10.1103/PhysRevLett.76.4003
BibTex
@article{AlaNissila1996Diffu-5308,
  year={1996},
  doi={10.1103/PhysRevLett.76.4003},
  title={Diffusive spreading of chainlike molecules on surfaces},
  number={21},
  volume={76},
  journal={Physical Review Letters},
  pages={4003--4006},
  author={Ala-Nissilä, Tapio and Herminghaus, Stephan and Hjelt, Tuomo and Leiderer, Paul}
}
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    <dcterms:abstract xml:lang="eng">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 Dc and Dt with a variety of methods. We show that Dc(O) has unusual behavior as a function of the coverage O. It first increases, but after a maximum goes to zero as O -&gt; 1. 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 Dc(O) which agrees well with the simulations.</dcterms:abstract>
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