INM - Leibniz-Institute for New Materials, Structure Formation Group, Campus D2 2, 66123 Saarbrücken, Germany.
Soft Matter. 2014 Mar 21;10(11):1696-704. doi: 10.1039/c3sm52949e.
The distribution of narrowly dispersed gold nanoparticles in hexane-in-water emulsions was studied for different surfactants. Good surfactants such as SDS and Triton X-100 block the oil-water interfaces and confine particles in the droplet. Other surfactants (Tween 85 and Span 20) form synergistic mixtures with the nanoparticles at the interfaces that lower the surface tension more than any component. Supraparticles with fully defined particle distribution form in the droplets only for surfactants that block the interface. Other surfactants promote the formation of fcc agglomerates. Nanoparticles in emulsions behave markedly different from microparticles-their structure formation is governed by free energy minimization, while microparticles are dominated by kinetics.
研究了不同表面活性剂存在下，窄分散金纳米粒子在正己烷-水乳液中的分布。良好的表面活性剂（如 SDS 和 Triton X-100）可以阻止油水界面，并将粒子限制在液滴中。其他表面活性剂（Tween 85 和 Span 20）与纳米粒子在界面上形成协同混合物，使表面张力比任何一种成分都低。只有在阻止界面的表面活性剂存在下，液滴中才会形成具有完全定义的粒子分布的超粒子。其他表面活性剂促进 FCC 聚集体的形成。与微米粒子相比，乳液中的纳米粒子表现出明显不同的行为——它们的结构形成受自由能最小化控制，而微米粒子则受动力学控制。
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