Assemblies of molecular aggregates in the blebbing motion of an oil droplet on an aqueous solution containing surfactant
Assemblies of molecular aggregates in the blebbing motion of an oil droplet on an aqueous solution containing surfactant
复制标题
DOI：
10.1016/j.colsurfa.2017.06.016
复制
发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
S. Uemoto;T. Toyota;L. Chiari;Tomonori Nomoto;M. Fujinami
中科院分区：
文献类型：
--
作者：
S. Uemoto;T. Toyota;L. Chiari;Tomonori Nomoto;M. Fujinami
研究和讨论了含表面活性剂(硬脂酰三甲基氯化铵)的水相中油滴(含溶解棕榈酸的正十二烷)的变形体特性。借助一系列粒子示踪剂，观察了分子聚集体的形成和运动。用准弹性激光散射法测量了水相表面张力随时间的变化。通过这些测量，我们发现变形虫行为发生在三个阶段。首先，由于Marangoni效应引起的对流流动，分子聚集体在油-水界面形成，随后在水表面扩散和吸收。在第二阶段，整个水相表面被这些分子聚集体饱和，并发生向液体凝聚单分子膜的相变。最后，在油滴底部形成区域，渗透性边界由分子聚集体的树枝状集合组成。气泡生长在油滴边缘分子聚集体聚集较高的部位。
The characteristic amoeboid behavior of an oil droplet (decane with dissolved palmitic acid) on an aqueous phase containing a surfactant (stearyltrimethylammonium chloride) has been investigated and discussed. The formation and motion of assemblies of molecular aggregates were observed with the aid of a range of particle tracers. The quasi-elastic laser scattering method was employed to measure the surface tension of the aqueous phase as a function of time. From those measurements we found that the amoeboid behavior occurs in three stages. First, molecular aggregates formed at the oil-water interface and subsequently spread and absorbed at the aqueous surface thanks to a convective flow due to the Marangoni effect. In the second stage, the whole aqueous surface was saturated with those molecular aggregates and a phase transition to a liquid condensed monolayer membrane occurred. Finally, domains formed at the bottom of the oil droplet with permeable boundaries composed of branch-shaped assemblies of molecular aggregates. Blebs grew in those parts of the oil droplet rim with high accumulation of molecular aggregates.