Diffusive spreading of chainlike molecules on surfaces

被引:47
作者
AlaNissila, T
Herminghaus, S
Hjelt, T
Leiderer, P
机构
[1] TAMPERE UNIV TECHNOL,PHYS LAB,FIN-33101 TAMPERE,FINLAND
[2] BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912
[3] MAX PLANCK INST COLLOID & INTERFACE SCI,D-12489 BERLIN,GERMANY
[4] UNIV KONSTANZ,FAK PHYS,D-7750 CONSTANCE,GERMANY
关键词
D O I
10.1103/PhysRevLett.76.4003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 --> 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 D-c(theta) which agrees well with the simulations.
引用
收藏
页码:4003 / 4006
页数:4
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