He Xiaoming, Hsiao Ming-Siao, Boott Charlotte E, Harniman Robert L, Nazemi Ali, Li Xiaoyu, Winnik Mitchell A, Manners Ian
School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.
UES, Inc. and Materials &Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA.
Nat Mater. 2017 Apr;16(4):481-488. doi: 10.1038/nmat4837. Epub 2017 Jan 9.
The creation of shaped, uniform and colloidally stable two-dimensional (2D) assemblies by bottom-up methods represents a challenge of widespread current interest for a variety of applications. Herein, we describe the utilization of surface charge to stabilize self-assembled planar structures that are formed from crystallizable polymer precursors by a seeded growth approach. Addition of crystallizable homopolymers with charged end-groups to seeds generated by the sonication of block copolymer micelles with crystalline cores yields uniform platelet micelles with controlled dimensions. Significantly, the seeded growth approach is characterized by a morphological memory effect whereby the origin of the seed, which can involve a quasi-hexagonal or rectangular 2D platelet precursor, dictates the observed 2D platelet shape. This new strategy is illustrated using two different polymer systems, and opens the door to the construction of 2D hierarchical structures with broad utility.
通过自下而上的方法制备形状规整、均匀且具有胶体稳定性的二维（2D）组装体，对于各种应用而言是当前广泛关注的一项挑战。在此，我们描述了利用表面电荷来稳定通过种子生长法由可结晶聚合物前体形成的自组装平面结构。将带有带电端基的可结晶均聚物添加到由具有结晶核的嵌段共聚物胶束超声处理产生的种子中，可得到尺寸可控的均匀片状胶束。值得注意的是，种子生长法的特点是具有形态记忆效应，即种子的起源（可能涉及准六边形或矩形二维片状前体）决定了观察到的二维片状形状。使用两种不同的聚合物体系说明了这种新策略，并为构建具有广泛用途的二维分级结构打开了大门。
