Bonet Avalos J, Johner A, Díez-Orrite S
Departament d'Enginyeria Quimica, ETSEQ, Universitat Rovira i Virgili, Avinguda dels Paisos Catalans, 26, 43007, Tarragona, Spain.
Eur Phys J E Soft Matter. 2006 Dec;21(4):305-17. doi: 10.1140/epje/i2006-10069-1. Epub 2007 Feb 8.
The structure of the layer formed after polymer adsorption onto a spherical particle is numerically studied by means of the application of the Single-Chain Mean-Field theory. We have determined several overall layer properties including the monomer volume fraction profiles, the layer thickness, adsorbances related to loops and to tails, as well as the variation of the crossover distance between loops and tails for different particle radii and fixed polymer length. When the radius of the sphere is small enough to affect the loop layer, one enters a single-adsorbed-chain regime, characterized by a critical sphere radius. In this regime, structural changes in the adsorbed layer arise. For such small sphere, the loop layer is confined to a region whose thickness is of the order of the radius of the adsorbing sphere, and two long tails dominate the outer layer and the adsorbance due to tails dominates that due to loops. An analysis of the structure of the outer tail layer for this small sphere case is also presented.
通过应用单链平均场理论，对聚合物吸附到球形颗粒上后形成的层结构进行了数值研究。我们确定了几个整体层性质，包括单体体积分数分布、层厚度、与环和尾相关的吸附量，以及不同颗粒半径和固定聚合物长度下环和尾之间交叉距离的变化。当球体半径小到足以影响环层时，就进入了单吸附链状态，其特征是有一个临界球体半径。在这种状态下，吸附层会出现结构变化。对于如此小的球体，环层被限制在一个厚度约为吸附球体半径的区域内，两条长尾巴主导外层，并且尾的吸附量主导环的吸附量。还给出了这种小球体情况下外尾层结构的分析。
