Materials Science Institute, PCFM Lab, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Sci Rep. 2013;3:1430. doi: 10.1038/srep01430.
Fabrication of monodisperse porous polymeric nanospheres with diameters below 500 nm remains a great challenge, due to serious crosslinking between neighboring nanospheres during pore-making process. Here we show how a versatile hypercrosslinking strategy can be used to prepare monodisperse microporous polystyrene nanospheres (MMPNSs) with diameters as low as ca. 190 nm. In our approach, an unreactive crosslinked PS outer skin as protective layer can be in-situ formed at the very beginning of hypercrosslinking treatment to minimize the undesired inter-sphere crosslinking. The as-prepared MMPNSs with a well-developed microporous network demonstrate unusual multifunctional properties, including remarkable colloidal stability in aqueous solution, good adsorption-release property for drug, and large adsorption capacity toward organic vapors. Surprisingly, MMPNSs can be directly transformed into high-surface-area monodisperse carbon nanospheres with good colloidal stability via a facile hydrothermal-assisted carbonization procedure. These findings provide a new benchmark for fabricating well-defined porous nanospheres with great promise for various applications.
制备直径低于 500nm 的单分散多孔聚合物纳米球仍然是一个巨大的挑战，因为在造孔过程中相邻纳米球之间会发生严重的交联。在这里，我们展示了一种通用的超交联策略如何用于制备具有低至约 190nm 直径的单分散微孔聚苯乙烯纳米球（MMPNS）。在我们的方法中，在超交联处理的一开始，可以原位形成无反应性交联 PS 外壳作为保护层，以最大限度地减少不必要的球间交联。所制备的具有发达微孔网络的 MMPNS 表现出异常的多功能性质，包括在水溶液中优异的胶体稳定性、对药物的良好吸附-释放性能以及对有机蒸气的大吸附容量。令人惊讶的是，MMPNS 可以通过简单的水热辅助碳化程序直接转化为具有高比表面积的单分散碳纳米球，并且具有良好的胶体稳定性。这些发现为制备具有良好定义的多孔纳米球提供了一个新的基准，为各种应用提供了广阔的前景。
