Department of Marine Engineering, Dalian Maritime University, Dalian, P. R. China.
Department of Navigation, Dalian Maritime University, Dalian, P. R. China.
Electrophoresis. 2022 Nov;43(21-22):2112-2119. doi: 10.1002/elps.202200125. Epub 2022 Jul 21.
Currently, there is very limited information on the electrophoretic behavior of particles at a liquid-liquid interface formed by two conducting liquid solutions. Here, electrophoretic velocities of polystyrene particles at a polyethylene glycol (PEG)-dextran (DEX) interface were investigated in this paper. Experimental results show that the particle at the interface moves in the opposite direction to the applied electric field, with a velocity much lower than that in the PEG-rich phase and a litter larger than that in the DEX-rich phase. Similarly to the movement in Newtonian fluids, the velocity increases linearly with the increase in the applied electric field. Different to particle electrophoresis in Newtonian fluids, the velocities of the particles at the PEG-DEX interface increase linearly with the decrease in particle's diameters, implying a possible size-based particle differentiation at an interface.
目前，关于在由两种导电溶液形成的液-液界面处颗粒的电泳行为，信息非常有限。本文研究了聚乙二醇（PEG）-葡聚糖（DEX）界面处聚苯乙烯颗粒的电泳速度。实验结果表明，界面处的颗粒朝着与外加电场相反的方向移动，其速度远低于富 PEG 相中的速度，略大于富 DEX 相中的速度。与牛顿流体中的颗粒运动类似，速度随外加电场的增加呈线性增加。与牛顿流体中的颗粒电泳不同，PEG-DEX 界面处颗粒的速度随颗粒直径的减小呈线性增加，这意味着在界面处可能存在基于尺寸的颗粒差异。
