通过pH辅助扩散电泳分离电荷调节型聚电解质

Separation of charge-regulated polyelectrolytes by pH-assisted diffusiophoresis.

作者信息

Hsu Jyh-Ping, Hsu Yen-Rei, Shang-Hung Hsieh, Tseng Shiojenn

机构信息

Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan and Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan.

Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan.

出版信息

Phys Chem Chem Phys. 2017 Mar 29;19(13):9059-9063. doi: 10.1039/c7cp00030h.

DOI:10.1039/c7cp00030h

PMID:28304033

Abstract

The potential of separating colloidal particles through simultaneous application of a salt gradient and a pH gradient, or pH-assisted diffusiophoresis, is evaluated by considering the case of spherical polyelectrolytes (PEs) having different equilibrium dissociation constants in an aqueous solution with KCl as the background salt. The simulation results gathered reveal that the dependence of the particle velocity on pH is more sensitive than that in pH-assisted electrophoresis, where an electric field and a pH gradient are applied simultaneously. This implies that the separation efficiency of pH-assisted diffusiophoresis can be better than that of pH-assisted electrophoresis. In particular, two types of PE having different equilibrium dissociation constants can be separated effectively by applying the former by enhancing/reducing their diffusiophoretic velocities.

摘要

通过考虑在以氯化钾为背景盐的水溶液中具有不同平衡解离常数的球形聚电解质（PEs）的情况，评估了通过同时施加盐梯度和pH梯度或pH辅助扩散泳来分离胶体颗粒的潜力。收集的模拟结果表明，颗粒速度对pH的依赖性比在同时施加电场和pH梯度的pH辅助电泳中更敏感。这意味着pH辅助扩散泳的分离效率可能优于pH辅助电泳。特别是，通过增强/降低两种具有不同平衡解离常数的PE的扩散泳速度，应用前者可以有效地分离它们。