Squeezing particle-stabilized emulsions into biliquid foams - equation of state†
Squeezing particle-stabilized emulsions into biliquid foams - equation of state†
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将颗粒稳定乳液挤压成双液体泡沫 - 状态方程†
DOI：
10.1039/c3sm51046h
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发表时间：
2013
期刊：
影响因子：
3.4
通讯作者：
J. H. Thijssen
中科院分区：
文献类型：
--
作者：
L. Maurice;R. A. Maguire;A. Schofield;M. Cates;P. Clegg;J. H. Thijssen
利用离心机测量了硬球胶体稳定的Pickering乳状液的(压力-密度)状态方程，以阐明颗粒对其力学性能的贡献。此外，我们开发了一种透明的Pickering乳剂，使我们能够使用共聚焦显微镜确定沉积物中局部体积分数作为距离的函数，从而从一个离心机循环中提取完整的状态方程。我们可以使用一个定量模型来解释和预测我们数据中的趋势，该模型包含了厚度为(微米级)颗粒的液滴间膜以及这些膜之间的排斥作用。我们认为，液滴之间的有效排斥是由于一个液滴上的粒子之间的液液界面由于对相邻液滴的压缩而变形的。
Using a centrifuge, we measure the (pressure vs. density) equation of state of Pickering emulsions stabilized by hard-sphere colloids, in order to elucidate the particle contribution to their mechanical properties. Moreover, we have developed a transparent Pickering emulsion, allowing us to determine local volume fraction as a function of distance within the sediment using confocal microscopy, thus extracting an entire equation of state from one centrifugation cycle. We can explain and predict trends in our data using a quantitative model incorporating interdroplet films with a thickness on the scale of the (micron-sized) particles and repulsive interactions across these films. We suggest that the effective repulsion between droplets is due to the deformation of the liquid–liquid interface between particles on one droplet due to compression against a neighbouring droplet.