School of Chemical Engineering, Sungkyunkwan University , Suwon 440-746, Republic of Korea.
ACS Nano. 2015 Nov 24;9(11):11333-41. doi: 10.1021/acsnano.5b05058. Epub 2015 Oct 26.
We report a simple and practical method for creating colloidal patchy particles with a variety of three-dimensional shapes via the evaporation-induced assembly of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) block copolymer (BCP) in an oil-in-water emulsion. Depending on the particle volume, a series of patchy particles in the shapes of snowmen, dumbbells, triangles, tetrahedra, and raspberry can be prepared, which are then precisely tuned by modulating the interfacial interaction at the particle/water interface using a mixture of two different surfactants. Moreover, for a given interfacial interaction, the stretching penalty of the BCPs in the patchy particles can be systematically controlled by adding P4VP homopolymers, which decreases the number of patches of soft particles from multiple patches to a single patch but increases the size of the patch. Calculations based on the strong segregation theory supported the experimental observation of various soft patchy particles and identified the underlying principles of their formation with tunable 3D structures.
我们报告了一种简单实用的方法，通过在油包水乳液中蒸发诱导聚苯乙烯-聚（4-乙烯基吡啶）（PS-b-P4VP）嵌段共聚物（BCP）的组装，制备具有各种三维形状的胶体各向异性粒子。根据粒子体积，可以制备出雪人、哑铃、三角形、四面体和覆盆子形状的一系列各向异性粒子，然后通过使用两种不同表面活性剂的混合物调节粒子/水界面的界面相互作用，对其进行精确调节。此外，对于给定的界面相互作用，通过添加 P4VP 均聚物，可以系统地控制各向异性粒子中 BCP 的拉伸惩罚，从而将软粒子的斑块数量从多个斑块减少到单个斑块，但增加了斑块的大小。基于强分相理论的计算支持了各种软各向异性粒子的实验观察，并确定了其形成的基本原理，这些粒子具有可调的 3D 结构。
