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Journal Articles Current Opinion in Colloid & Interface Science Year : 2022

Electrostatics and electrophoresis of engineered nanoparticles and particulate environmental contaminants : beyond zeta potential-based formulation

Abstract

Colloidal nano/micro-(bio)particles carry an electrostatic charge in aqueous media and this charge is critical in defining their stability or (bio)adhesion properties, or their toxicity towards humans and aquatic biota. Determination of interfacial electrostatics of these particles is generally performed from zeta potential estimation using historical electrophoresis theory by Smoluchowski. The latter, however, strictly applies to the ideal case of hard particles defined by a surface charge distribution under the strict conditions of particle impermeability to background electrolyte ions and to (electroosmotic) flow. Herein, we review sound theoretical alternatives for capturing the electrokinetic and therewith electrostatic features of soft colloids of practical interest defined by a 3D distribution of their structural charges, and by a finite permeability to ions and/or flow (e.g. bacteria, viruses, nanoplastics, (bio)functionalized particles or engineered nanoparticles). Reasons for the inadequacy of commonly adopted hard particle electrophoresis models applied to soft particulate materials are motivated, and analytical expressions that properly capture their electrophoretic response are comprehensively reviewed.
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Dates and versions

hal-04287841 , version 1 (15-11-2023)

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Partha Gopmandal, Jérôme F.L. Duval. Electrostatics and electrophoresis of engineered nanoparticles and particulate environmental contaminants : beyond zeta potential-based formulation. Current Opinion in Colloid & Interface Science, 2022, 60, pp.101605. ⟨10.1016/j.cocis.2022.101605⟩. ⟨hal-04287841⟩
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