Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA.
J Colloid Interface Sci. 2010 May 15;345(2):131-7. doi: 10.1016/j.jcis.2010.02.002. Epub 2010 Feb 10.
We developed an efficient synthesis of monodisperse, highly surface charged, high refractive index ZnS spherical particles by using a gel-sol method. Concentrated solutions of zinc-ammonia-NTA (nitrilotriacetic acid) were reacted with thioacetamide in the presence of gelatin which stabilized the growing particles. We dramatically increased the particle surface charge density by condensing silica and silylated phosphonate groups on the particle surface. These monodisperse highly charged ZnS particles are somewhat porous and have a refractive index of 1.868. These are the highest refractive index, monodisperse, highly charged spherical particles to self assemble into non-close-packed crystalline colloidal arrays which Bragg diffract light.
我们开发了一种高效的单分散、高表面电荷、高折射率 ZnS 球形粒子的合成方法，该方法采用凝胶-溶胶法。在明胶存在的情况下，将浓锌-氨-NTA（氮三乙酸）溶液与硫代乙酰胺反应，明胶稳定了生长中的颗粒。我们通过在颗粒表面缩合硅和硅烷化膦酸酯基团，显著增加了颗粒的表面电荷密度。这些单分散的高电荷 ZnS 颗粒具有一定的多孔性，折射率为 1.868。这些是具有最高折射率、单分散、高电荷的球形颗粒，可自组装成非密堆积的结晶胶体阵列，该阵列对光进行布拉格衍射。
