Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran.
Department of Mechanical Engineering, University of Kurdistan, Sanandaj 66177-15175, Iran.
Colloids Surf B Biointerfaces. 2018 Oct 1;170:129-135. doi: 10.1016/j.colsurfb.2018.05.053. Epub 2018 May 24.
The effect of ion partitioning on the electrostatics of a soft particle with a volumetrically charged core and a pH-dependent polyelectrolyte layer (PEL) is numerically investigated. It is observed that, whenever the ion partitioning is noticeable, the soft layer can be fully charged in a broader range of pH. Besides, a higher number density of the PEL functional groups and a lower charge density of the core result in a sharper dependence of the electric potential on the electrolyte pH. Briefly, we conclude that, since the PEL charge is dependent upon the concentration of the hydroxide/hydrogen ions, for the pH-regulated soft particles, the ion partitioning effect, as a phenomenon influencing the ionic distribution, can be a determinant factor. So taking the effect of the ion partitioning into consideration is strongly recommended for a more realistic description of the electrostatics of the pH-regulated soft particles.
离子分配对具有体积带电核和 pH 依赖聚电解质层 (PEL) 的软颗粒静电的影响进行了数值研究。结果表明，只要离子分配明显，软层在更宽的 pH 范围内可以完全带电。此外，较高的 PEL 官能团数密度和较低的核电荷密度导致电势对电解质 pH 的依赖性更强。简而言之，我们得出结论，由于 PEL 电荷取决于氢氧根/氢离子的浓度，对于 pH 调节软颗粒，离子分配效应作为影响离子分布的现象，可以成为一个决定性因素。因此，为了更真实地描述 pH 调节软颗粒的静电，强烈建议考虑离子分配的影响。
