Adsorption on a boundary line confining a monolayer of particles self-assembling into clusters is studied by Monte Carlo 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. For the chemical potential values below the order-disorder phase transition the adsorption isotherms were shown to undergo nonstandard behavior, i.e., the adsorption exhibits a maximum on 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, and (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.

中文翻译：

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团簇形成系统的二维模型中的吸附异常。

通过蒙特卡洛模拟研究了边界线的吸附，该边界线将单层颗粒自组装成团簇。我们专注于通过竞争性相互作用势相互作用的粒子系统，在该系统中，有效的短程吸引之后是长程排斥。对于低于有序-无序相变的化学势值，吸附等温线表现出非标准行为，即，吸附在无结构和无序团簇流体之间的结构转变上表现出最大值。特别是，我们发现，当（i）簇在主体中的单体上占优势时，（ii）垂直于约束线的方向上的密度分布呈现出振荡衰减，吸附会随着化学势的增加而降低。（iii）在吸附壁附近的层中的相关函数在平行于该壁的方向上表现出振荡衰减。我们的报告指出了简单和复杂的流体吸附过程之间的显着差异。