Institute of Organic Chemistry III-Macromolecular Chemistry and Organic Materials , University of Ulm , Albert-Einstein-Allee 11 , 89081 Ulm , Germany.
Inorganic Chemistry II , University of Ulm , Albert-Einstein-Allee 11 , 89081 Ulm , Germany.
ACS Appl Mater Interfaces. 2018 Jul 18;10(28):24310-24319. doi: 10.1021/acsami.8b07303. Epub 2018 Jul 5.
Dye stabilized nanoemulsions offer the unique possibility of creating both silica capsules and sub-20-nm particles with precise control of particle size and narrow dispersity from the same system by the choice of the proper dye. The large o/w interface enhances the kinetics of particle formation significantly over macroscopic interfaces which enables the synthesis of silica nanoparticles without any catalyst or elevated temperatures under static conditions. This is in contrast to syntheses for sub-20-nm silica nanoparticles described until now which can normally not be conducted at neutral pH and/or room temperature without stirring. Furthermore, the synthesis can be run without any additional organic solvent and the dyes can be easily removed from the dispersion which opens the pathway to silica dispersions containing only particles, traces of ethanol and water at neutral pH without centrifugation, washing, or redispersion in accordance with the idea of "green chemistry".
染料稳定的纳米乳液提供了独特的可能性，可以通过选择合适的染料，从同一体系中精确控制粒径和窄分散度，同时制备二氧化硅胶囊和亚 20nm 颗粒。大的 o/w 界面显著增强了颗粒形成的动力学，与宏观界面相比，这使得在静态条件下无需催化剂或升高温度即可合成二氧化硅纳米颗粒。这与迄今为止描述的亚 20nm 二氧化硅纳米颗粒的合成形成对比，这些合成通常不能在中性 pH 和/或室温下进行，而无需搅拌。此外，该合成可以在没有任何额外有机溶剂的情况下进行，并且染料可以很容易地从分散体中去除，这为在中性 pH 下不含离心、洗涤或重新分散的情况下，仅含有颗粒、痕量乙醇和水的二氧化硅分散体开辟了道路，符合“绿色化学”的理念。
