On the electrophoretic mobility of succinoglycan modelled as a spherical polyelectrolyte: From Hermans-Fujita theory to charge regulation in multi-component electrolytes

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:482

Article

Hill, Reghan J.¹ 

[1] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 0C5, Canada

关键词: Spherical polyelectrolyte;    Electrophoretic mobility;    Charge regulation;    Double-layer-polarization;    Electrokinetic theory;   

DOI  :  10.1016/j.jcis.2016.07.003

来源: Elsevier

【 摘 要 】

Literature interpretations of the electrophoretic mobility of spherical polyelectrolytes are revisited using the capillary-electrophoresis data of Duval et al. (2006) for the extracellular polysaccharide succinoglycan as an example. Subtle changes in the polyelectrolyte mobility have recently been attributed to new electrokinetic theories that feature multi-component electrolytes, charge regulation, and the so-called polarization and relaxation phenomena. However, these calculations exhibit several unusual trends that have yet to be explained, and so the conclusions drawn from them are controversial. Here, independent computations strengthen conclusions drawn from the original model of Duval et al., i.e., the discrepancies between experiments and all the presently available electrokinetic theories reflect changes in the conformation of succinoglycan arising from changes in the electrolyte pH and ionic strength. (C) 2016 Elsevier Inc. All rights reserved.

【 授权许可】

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