团簇形成系统二维模型中的吸附异常
Adsorption anomalies in a 2D model of cluster-forming systems
摘要：
用MC模拟方法研究了单分子层颗粒自组装成团簇的边界线上的吸附。我们专注于一个质点系通过竞争相互作用势相互作用，其中有效的短程吸引之后是长程排斥，模仿所谓的SALR系统。当化学势低于有序-无序相变时，吸附等温线表现出非标准行为，即：e.吸附在无结构和无序团簇流体之间的结构转变时表现出最大值。特别是，我们已经发现，吸附减少增加化学势时，（i）团簇占主导地位的单体在散装，（ii）在垂直于限制线的方向上的密度分布表现出振荡衰减，（iii）在吸附壁附近的层中的关联函数表现出振荡衰减在平行于此壁的方向。我们的报告指出了简单和复杂流体吸附过程之间的显著差异。
英文摘要：
Adsorption on a boundary line confining a monolayer of particles self-assembling into clusters is studied by MC simulations. We focus on a system of particles interacting via competing interaction potential in which effectively short-range attraction is followed by long-range repulsion, mimicking the so called SALR system. For the chemical potential values below the order-disorder phase transition the adsorption isotherms were shown to undergo non-standard behavior, i. e. the adsorption exhibits a maximum upon structural transition between structureless and disordered cluster fluid. In particular, we have found that the adsorption decreases for increasing chemical potential when (i) clusters dominate over monomers in the bulk, (ii) the density profile in the direction perpendicular to the confining line exhibits an oscillatory decay, (iii) the correlation function in the layer near the adsorption wall exhibits an oscillatory decay in the direction parallel to this wall. Our report indicates striking differences between simple and complex fluid adsorption processes.
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