Role of diffusion in irreversible deposition
Role of diffusion in irreversible deposition
复制标题
扩散在不可逆沉积中的作用
DOI：
10.1103/physreve.55.3111
复制
发表时间：
1997
影响因子：
2.4
通讯作者：
B. Chopard
中科院分区：
文献类型：
--
作者：
P. Luthi;J. Ramsden;B. Chopard
用扩散沉积的元胞自动机模型研究了球体在固体表面的吸附。与以往的模型不同，该模型在微观水平上显式地考虑了颗粒从块体到表面的扩散输运及其与被吸附颗粒的相互作用。我们研究了初始时间域，它决定了随后的演化，在此期间表面的粒子通量不是恒定的。我们观察到扩散驱动的吸附与随机顺序吸附(RSA)有很大的不同，当颗粒在二维主体中扩散并吸附在一维衬底上时。我们还发现，扩散运动的微观细节对沉积动力学和覆盖范围的干扰极限都有影响。RSA模型似乎是一个很好的近似，特别是对于二维沉积，但不能一般地表示扩散沉积。{版权所有}{ITAL 1997}{ITAL The American Physitive Society}
The adsorption of spheres onto solid surfaces is investigated using a cellular automaton model of diffusion deposition. Unlike previous models, the diffusive transport of the particles from the bulk to the surface as well as their interaction with adsorbed particles are explicitly considered at a microscopic level. We study the initial time regime, which determines the subsequent evolution and during which the particle flux at the surface is not constant. We observe that diffusion-driven adsorption differs significantly from random sequential adsorption (RSA) when particles diffuse in a two-dimensional bulk and are adsorbed on a one-dimensional substrate. We also find that the microscopic details of the diffusive motion influence both the kinetics of deposition and the jamming limit of the coverage. The RSA model appears to be a good approximation, especially for two-dimensional deposition, but cannot generally represent diffusion deposition. {copyright} {ital 1997} {ital The American Physical Society}