Electrophoretic Mobility of a Water-in-Oil Droplet Separately Affected by the Net Charge and Surface Charge Density
Electrophoretic Mobility of a Water-in-Oil Droplet Separately Affected by the Net Charge and Surface Charge Density
复制标题
分别受净电荷和表面电荷密度影响的油包水液滴的电泳迁移率
DOI：
10.1021/acs.langmuir.1c03145
复制
发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Ohshima Hiroyuki
中科院分区：
文献类型：
--
作者：
Uematsu Yuki;Ohshima Hiroyuki
油包水乳液和液滴表现出与水包油乳液和液滴完全不同的物理化学性质。因此，直接将标准理论模型应用于油包水体系不能描述这些异常性质。在这里，电泳迁移率的油包水液滴的分析研究使用Debye-Hu Speckel线性化和忽略Marangoni效应。所得到的电泳迁移率被证明是单独依赖于液滴的净电荷和液滴界面处的表面电荷密度。此外，当净电荷可忽略时，电泳迁移率与表面电荷密度成负系数。这表明内部双电层对电泳有相反的贡献。将该理论应用于文献中的油包水乳液和液滴的实验数据，并讨论了该理论的定性和定量验证。
Water-in-oil emulsions and droplets exhibit physicochemical properties completely different from those of oil-in-water emulsions and droplets. Thus, directly applying a standard theoretical model to water-in-oil systems cannot describe these anomalous properties. Here, the electrophoretic mobility of a water-in-oil droplet is analytically investigated using Debye–Hückel linearization and neglecting the Marangoni effect. The resulting electrophoretic mobility is shown to be separately dependent on the net charge of the droplet and the surface charge density at the droplet interface. Furthermore, when the net charge is negligible, the electrophoretic mobility is proportional to the surface charge density with a negative coefficient. This indicates that the internal electric double layer inversely contributes to the electrophoresis. This theory is applied to experimental data of water-in-oil emulsions and droplets in the literature, and qualitative and quantitative verification of the theory is discussed.