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Solvent‐mediated nonelectrostatic ion–ion interactions predicting anomalies in electrophoresis
Author(s) -
Goswami Prakash,
Dhar Jayabrata,
Ghosh Uddipta,
Chakraborty Suman
Publication year - 2017
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201600394
Subject(s) - electrophoresis , ion , particle (ecology) , materials science , chemical physics , linearization , electrophoretic light scattering , chemistry , chromatography , nanotechnology , physics , nonlinear system , organic chemistry , quantum mechanics , dynamic light scattering , oceanography , nanoparticle , geology
We study the effects of solvent‐mediated nonelectrostatic ion–ion interactions on electrophoretic mobility of a charged spherical particle. To this end, we consider the case of low surface electrostatic potential resulting in the linearization of the governing equations, which enables us to deduce a closed‐form analytical solution to the electrophoretic mobility. We subsequently compare our results to the standard model using Henry's approach and report the changes brought about by the nonelectrostatic potential. The classical approach to determine the electrophoretic mobility underpredicts the particle velocity when compared with experiments. We show that this issue can be resolved by taking into account nonelectrostatic interactions. Our analysis further reveals the phenomenon of electrophoretic mobility reversal that has been experimentally observed in numerous previous studies.