Nonlinear Effects on Electrophoresis of a Soft Particle and Sustained Solute Release

Ghoshal, U. K.; Bhattacharyya, S.; Gopmandal, Partha P.; De, Simanta

doi:10.1007/s11242-017-0952-7

Cited by 18 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A variety of soft surface electrokinetic models have therefore been reported to provide a quantitative connection between electrophoretic mobility and electrostatic features of soft particles (see [1,25,[41][42] and references therein). The models differ according to their treatment of particle electrostatics based on linear or nonlinear Poisson-Boltzmann theory, to their account or not of double layer polarization, to their integration or not of inhomogeneous distribution of structural charges within the soft particle body and to the boundary conditions adopted at the very core/surface layer interface [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]. Various approximate analytical expressions have been derived for the electrophoretic mobility of soft particles, in particular by Ohshima and colleagues [25,[43][44][45][46][47][51][52][53][54][55], essentially under conditions where electric double layer polarization by the applied electric field is insignificant.…”

Section: Introductionmentioning

confidence: 99%

Electrophoresis of composite soft particles with differentiated core and shell permeabilities to ions and fluid flow

Maurya

Gopmandal

Ohshima

et al. 2020

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Within the framework of analytical theories for soft surface electrophoresis, soft particles are classically defined by a hard impermeable core of given surface charge density surrounded by a polyelectrolyte shell layer permeable to both electroosmotic flow and ions from background electrolyte. This definition excludes practical core-shell particles, e.g. dendrimers, viruses or multi-layered polymeric particles, defined by a polyelectrolytic core where structural charges are distributed and where counter-ions concentration and electroosmotic flow velocity can be significant. Whereas a number of important approximate expressions has been derived for the electrophoretic mobility of hard and soft particles, none of them is applicable to such generic composite core-shell particles with differentiated ions-and fluid flow-permeabilities of their core and shell components. In this work, we elaborate an original closed-form electrophoretic mobility expression for this generic composite particle type within the Debye-Hückel electrostatic framework and thin double layer approximation. The expression explicitly involves the screening Debye layer thickness and the Brinkman core and shell hydrodynamic length scales, which favors so-far missing analysis of the respective core and shell contributions to overall particle mobility. Limits of this expression successfully reproduce results from Ohshima's electrophoresis theory solely applicable to soft particles with or without hard core.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrophoresis of composite soft particles with differentiated core and shell permeabilities to ions and fluid flow

Maurya

Gopmandal

Ohshima

et al. 2020

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Brinkman model is considered as a hydrodynamic continuum and can be characterized by the Darcy permeability coefficient. In the literature, an extension was made to the Brinkman model adding a term representing the electrokinetic transport phenomena inside the porous medium [19–26]. Tsai et al.…”

Section: Introductionmentioning

confidence: 99%

Transient electrophoresis of a conducting spherical particle embedded in an electrolyte‐saturated Brinkman medium

2021

View full text Add to dashboard Cite

In this study, the time‐dependent electrophoretic motion of a conducting spherical particle embedded in an arbitrary electrolyte solution saturated porous medium is investigated. The porous medium is uniformly charged and the embedded hard particle is charged with constant ζ‐potential or constant surface charge density. The unsteady modified Brinkman equation with an electric force term, which governs the fluid velocity field, is used to model the porous medium and is solved by Laplace's transform technique. An analytical expression for the electrophoretic velocity of the spherical particle is obtained in Laplace transform domain as a function of the relevant parameters, and its inversion is obtained through numerical techniques. Also, in this study, the steady‐state electrophoretic velocity is obtained analytically as linear functions of ζ‐potential (or surface density charge) and the fixed charge density. The steady‐state electrophoretic velocity is displayed graphically for various relevant parameters and compered with the available data in the literature. Also, the numerical values of the transient electrophoretic velocity are plotted versus the nondimensional elapsed time and discussed for different values of the Debye length parameter, density ratio, permeability of the porous medium, and for high and nonconducting particles.

show abstract

“…Dukhin et al [15] and Ohshima [16] studied the electrokinetics of soft particles considering acidic ionizable groups present along the peripheral PEL. In addition, a number of numerical studies are also available on the electrokinetic transport of this kind of particles considering constant/pH-regulated charged properties of the PEL, uniform/heterogeneous distribution of hydrodynamic and electrical properties across the PEL [17][18][19][20][21][22][23][24], etc. It is interesting to note that the effects of the nonuniform distribution of the fixed charge density and the Brinkman parameter of the PEL become appreciable especially in the low electrolyte concentration range [25,26].…”

Section: Introductionmentioning

confidence: 99%

Electrophoresis of soft particles with hydrophobic inner core grafted with pH‐regulated and highly charged polyelectrolyte layer

et al. 2021

Self Cite

View full text Add to dashboard Cite

Electrophoresis of core–shell composite soft particles possessing hydrophobic inner core grafted with highly charged polyelectrolyte layer (PEL) has been studied analytically. The PEL bears pH‐dependent charge properties due to the presence of zwitterionic functional groups. The dielectric permittivity of the PEL and bulk aqueous medium were taken to be different, which resulted in the ion‐partitioning effect. Objective of this study was to provide a simple expression for the mobility of such core–shell soft particles under Donnan limit where the thickness of the PEL well exceeds the electric double layer thickness. Going beyond the widely used Debye–Hückel linearization, the nonlinear Poisson–Boltzmann equation coupled with Stokes–Darcy–Brinkman equations was solved to determine the electrophoretic mobility. The derived expression further recovers all the existing results for the electrophoretic mobility under various simplified cases. The graphical presentation of the results illustrated the impact of pertinent parameters on the electrophoretic mobility of such a soft particle.

show abstract

Nonlinear Effects on Electrophoresis of a Soft Particle and Sustained Solute Release

Cited by 18 publications

References 27 publications

Electrophoresis of composite soft particles with differentiated core and shell permeabilities to ions and fluid flow

Electrophoresis of composite soft particles with differentiated core and shell permeabilities to ions and fluid flow

Transient electrophoresis of a conducting spherical particle embedded in an electrolyte‐saturated Brinkman medium

Electrophoresis of soft particles with hydrophobic inner core grafted with pH‐regulated and highly charged polyelectrolyte layer

Contact Info

Product

Resources

About