Solvent-Induced Self-Assembly of Polymer-Tethered Nanorods
Solvent-Induced Self-Assembly of Polymer-Tethered Nanorods
复制标题
聚合物束缚纳米棒的溶剂诱导自组装
DOI：
10.1021/jp101129p
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发表时间：
2010-06-03
影响因子：
3.3
通讯作者：
Liang, Haojun
中科院分区：
文献类型：
--
作者：
He, Linli;Zhang, Linxi;Liang, Haojun
采用耗散粒子动力学（DPD）模拟方法系统地研究了聚合物系纳米棒在选择性溶剂中的自组装行为。考虑了三种类型的聚合物系留纳米棒：一端系留、两端系留和中间系留。溶剂诱导的多种形态和形态转变取决于拓扑结构、杆/系绳长度比、溶剂选择性和混合溶剂含量。在纯棒状选择性溶剂（溶剂I）或纯绳状选择性溶剂（溶剂II）中，有序胶束结构包括：圆柱体、六角形圆柱体、双层片层、片柱/柱混合相、倒置空心圆柱体和向列束。这些胶束是由系绳的拉伸、棒的液晶、界面能和溶剂选择性之间的竞争形成的。在I/II混合溶剂中，按顺序改变混合溶剂含量（即改变块体的溶剂质量），观察到可逆的形态转变和奇妙的中间相（如液晶相），这与纯溶剂中改变棒/系绳长度比所引起的情况直接对应。结果表明，提高选择性溶剂含量相当于提高可溶嵌段比。本研究表明，聚合物系链纳米棒的形态和形态转变可以通过拓扑结构、嵌段长度和溶剂，尤其是选择性来进行显著的控制。
Self-assembly behaviors of polymer-tethered nanorods in the selective solvent are systematically investigated via a dissipative particle dynamics (DPD) simulation method. Three types of polymer-tethered nanorods are considered: one end tethered, both ends tethered, and middle tethered. The solvent-induced diverse morphologies and morphological transitions depend on the topology, rod/tether length ratio, solvent selectivity, and mixed solvent content. In the pure rod-selective solvent (solvent I) or the pure tether-selective solvent (solvent II), the ordered micellar structures include: cylinders, hexagonal cylinders, bilayer lamellae, lamellae/cylinder mixed phases, inverted hollow cylinders, and nematic bundles. These micelles are formed by the competition among the stretching of tethers, liquid crystalline of rods, interfacial energy, and solvent selectivity. In the I/II mixed solvent, with varying mixed solvent content in sequence (i.e., changing the solvent quality for the blocks), the reversible morphological transitions and fantastic intermediate phases (e.g., liquid crystalline phase) are observed, which correspond directly to the case of that induced by varying the rod/tether length ratio in the pure solvent. It is concluded that improving the selective solvent content is equivalent to increasing the soluble block ratio. The present study reveals that the morphology and morphological transition of polymer-tethered nanorods could be significantly manipulated through topology, block length, and solvent, especially the selectivity.