Clegg Paul S, Herzig Eva M, Schofield Andrew B, Egelhaaf Stefan U, Horozov Tommy S, Binks Bernard P, Cates Michael E, Poon Wilson C K
SUPA, School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, United Kingdom.
Langmuir. 2007 May 22;23(11):5984-94. doi: 10.1021/la063707t. Epub 2007 Apr 18.
We present microscopy studies of particle-stabilized emulsions with unconventional morphologies. The emulsions comprise pairs of partially miscible fluids and are stabilized by colloids. Alcohol-oil mixtures are employed; silica colloids are chemically modified so that they have partial wettability. We create our morphologies by two distinct routes: starting with a conventional colloid-stabilized emulsion or starting in the single-fluid phase with the colloids dispersed. In the first case temperature cycling leads to the creation of extended fluid domains built around some of the initial fluid droplets. In the second case quenching into the demixed region leads to the formation of domains which reflect the demixing kinetics. The structures are stable due to a jammed, semisolid, multilayer of colloids on the liquid-liquid interface. The differing morphologies reflect the roles in formation of the arrested state of heterogeneous and homogeneous nucleation and spinodal decomposition. The latter results in metastable, bicontinuous emulsions with frozen interfaces, at least for the thin-slab samples, investigated here.
我们展示了具有非常规形态的颗粒稳定乳液的显微镜研究。这些乳液由部分互溶的流体对组成，并由胶体稳定。采用醇 - 油混合物；对二氧化硅胶体进行化学改性，使其具有部分润湿性。我们通过两种不同的途径形成我们的形态：从传统的胶体稳定乳液开始，或者从胶体分散的单流体相开始。在第一种情况下，温度循环导致围绕一些初始液滴形成扩展的流体域。在第二种情况下，骤冷到混合区域会导致形成反映混合动力学的域。由于液 - 液界面上胶体的堵塞、半固态多层结构，这些结构是稳定的。不同的形态反映了非均相和均相成核以及旋节线分解在形成停滞状态中的作用。至少对于本文研究的薄板样品，后者导致具有冻结界面的亚稳双连续乳液。
