Precise Localization of Inorganic Nanoparticles in Block Copolymer Micellar Aggregates: From Center to Interface
Precise Localization of Inorganic Nanoparticles in Block Copolymer Micellar Aggregates: From Center to Interface
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嵌段共聚物胶束聚集体中无机纳米颗粒的精确定位：从中心到界面
DOI：
10.1021/ma501835r
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发表时间：
2015-01-13
期刊：
影响因子：
5.5
通讯作者：
Jiang, Wei
中科院分区：
文献类型：
--
作者：
Liang, Ruijing;Xu, Jiangping;Jiang, Wei
无机纳米颗粒在聚合物基质中的定位对杂化材料的性能起着至关重要的作用。在这里，我们采用了一种简单而通用的氢键导向超分子组装(HBSA)策略，通过调节Au纳米粒子表面聚合物刷的选择性，控制Au纳米粒子从中心到界面的定域化。PS-b-P4VP(PDP)与正十五烷基酚(PDP)通过吡啶与PDP羟基之间的氢键作用，构建了PS-b-P4VP(PDP)(X)复合超分子。PS-Au纳米粒子(PS-Au NPs)被选择性地定位在PS结构域中，而PS和P4VP-Au NPs的二元混合物(PS/P4VP-Au NPs)被吸附到PS和P4VP(PDP)x结构域之间的界面上，这可能是由于PS和P4VP配体在Au NPs表面的重新分布，触发了两亲性表面活性物质类NPs的形成。通过对超分子的选择性分解，得到了具有可控定位的孤立的柱状胶束聚集体。此外，还对超分子嵌段结构域大小、超分子组成、金纳米粒子的大小以及金纳米粒子的体积分数进行了详细的研究，以揭示它们对杂化胶束聚集体的形态和定位的影响。这些具有可控定位和载金效率的杂化胶束聚集体可能会扩大杂化胶束聚集体的应用范围，并在光学/电子器件、催化和药物输送系统中发现更多的潜在用途。
Localization of inorganic nanoparticles (NPs) into polymer matrix plays a crucial role in determining the performance of the hybrid materials. Herein, we employed a simple, yet versatile hydrogen bonding directed supramolecular assembly (HBSA) strategy to control the localization of Au NPs from the center to the interface in polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) cylindrical micellar aggregates by tailoring the selectivity of polymer brushes on the surface of Au NPs. PS-b-P4VP(PDP)(x) combcoil supramolecules were constructed by PS-b-P4VP and n-pentadecylphenol (PDP) via the hydrogen bonding between the pyridine of P4VP and the hydroxyl of PDP. PS-tethered Au NPs (PS-Au NPs) were selectively localized in the PS domain while a binary mixture of PS and P4VP-tethered Au NPs (PS/P4VP-Au NPs) were adsorbed to the interface between PS and P4VP(PDP)x domains presumably due to the redistribution of PS and P4VP ligands on the Au NPs surface, triggering the formation of amphiphilic surfactant-like NPs. Isolated cylindrical micellar aggregates with controlled localization of Au NPs were obtained by the selective disassembly of the supramolecules. Moreover, supramolecular block domain size, composition of the supramolecules, size of the Au NPs, and volume fraction of the Au NPs were carefully investigated to reveal their effects on the morphology of hybrid micellar aggregates and localization of NPs. These hybrid micellar aggregates with controlled localization and loading efficiency of Au NPs may extend the applications of the hybrid micellar aggregates and find more potential uses in optical/electronic devices, catalysis, and drug delivery system.