Phase behavior in thin films of confined colloid-polymer mixtures.
Phase behavior in thin films of confined colloid-polymer mixtures.
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DOI：
10.1021/ja057569q
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发表时间：
2006-02
影响因子：
15
通讯作者：
Chun-Lai Ren;Yu-qiang Ma
中科院分区：
文献类型：
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作者：
Chun-Lai Ren;Yu-qiang Ma
利用自洽场和密度泛函理论，我们首先研究了限制在两个由聚合物接枝的软表面之间的胶体聚合物薄膜的胶体自组装。随着胶体浓度的增加，薄膜在平面内经历了一系列从无序液体→稀疏方形→六边形（或混合方形六边形）→致密方形→圆柱形结构的转变，这是聚合物刷的熵弹性与胶体颗粒的空间堆积效应之间竞争的结果。相图显示了随着胶体浓度的变化不同层内有序结构的稳定区域以及随着聚合物接枝密度的降低而发生的分层转变。我们的结果展示了一种新的控制机制来稳定薄膜内结构的有序性。
Using self-consistent-field and density-functional theories, we first investigate colloidal self-assembly of colloid-polymer films confined between two soft surfaces grafted by polymers. With increasing colloidal concentrations, the film undergoes a series of transitions from disordered liquid --> sparse square --> hexagonal (or mixed square-hexagonal) --> dense square --> cylindrical structures in a plane, which results from the competition between the entropic elasticity of polymer brushes and the steric packing effect of colloidal particles. A phase diagram displays the stable regions of different in-layer ordering structures as the colloidal concentration is varied and layering transitions as the polymer-grafted density is decreased. Our results show a new control mechanism to stabilize the ordering of structures within the films.