On electrophoresis of a pH‐regulated nanogel with ion partitioning effects

Majee, Partha Sarathi; Bhattacharyya, S.; Dutta, Prashanta

doi:10.1002/elps.201800291

Cited by 10 publications

(7 citation statements)

References 39 publications

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“…Since polyelectrolyte layer and bulk electrolyte solution have distinct dielectric permittivity, the self-energies of an ion, W i , in the two regions differ from each other. The difference in self-energy of the ion causes ion partitioning, which can be quantified as ion partition coefficient [44,45,46,47,48,49,50]…”

Section: Theorymentioning

confidence: 99%

“…Ion partitioning effect modifies the charge density in polyelectrolyte layer and consequently affects the electrophoresis of soft charged particles as well as electrokinetics in soft nanochannels. Very recently, ion partitioning effect attracted a great deal of interest of researchers studying the electrophoresis of charged soft particles immersed in electrolytes [44,45,46,47,48,49,50] and electrokinetic transport in soft nanochannels [51,52,53]. The analytical and numerical studies [44,49,50,45,46,47,48],…”

Section: Introductionmentioning

confidence: 99%

“…Very recently, ion partitioning effect attracted a great deal of interest of researchers studying the electrophoresis of charged soft particles immersed in electrolytes [44,45,46,47,48,49,50] and electrokinetic transport in soft nanochannels [51,52,53]. The analytical and numerical studies [44,49,50,45,46,47,48],…”

Section: Introductionmentioning

confidence: 99%

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Ion partitioning effect on the electrostatic interaction between two charged soft surfaces

Sin

2022

Preprint

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We theoretically investigate electrostatic properties between two charged surfaces with a grafted polyelectrolyte layer in an aqueous electrolyte solution by using the Poisson-Boltzmann approach accounting for ion partitioning. In order to consider the ion partitioning effect, we focus on changes of electrostatic properties due to the difference in dielectric permittivity of the polyelectrolyte layer and the aqueous electrolyte solution. We find that ion partitioning enhances electrostatic potential in the region between two charged soft surfaces and hence increases the electrostatic interaction between two charged soft surfaces. Ion partitioning effect on osmotic pressure is enhanced not only by an increase in the thickness of polyelectrolyte layer and Debye length but also by a decrease in ion radius.

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Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ion partitioning effect on the electrostatic interaction between two charged soft surfaces

Sin

2022

Preprint

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“…Electrophoresis is one of the most widely used experimental methods and practical operations for the transport, manipulation, separation, assembly, and characterization of colloidal particles. In the past, some formulas for the steady electrophoretic mobility of a charged particle were derived analytically for the cases of hard sphere (impermeable to both the solvent and small ions) , porous sphere (permeable) , soft sphere (hard in the core but porous in the surface layer) , and porous spherical shell (e.g. microcapsule or vesicle) .…”

Section: Introductionmentioning

confidence: 99%

Transient electrophoresis of a charged porous particle

Lai

Keh

2020

Electrophoresis

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Transient electrophoresis of a charged porous particleThe starting electrophoretic motion of a porous, uniformly charged, spherical particle, which models a solvent-permeable and ion-penetrable polyelectrolyte coil or floc of nanoparticles, in an arbitrary electrolyte solution due to the sudden application of an electric field is studied for the first time. The unsteady Stokes/Brinkman equations with the electric force term governing the fluid velocity fields are solved by means of the Laplace transform. An analytical formula for the electrophoretic mobility of the porous sphere is obtained as a function of the dimensionless parameters κa, λa, ρ p /ρ, and νt/a 2 , where a is the radius of the particle, κ is the Debye screening parameter, λ is the reciprocal of the square root of the fluid permeability in the particle, ρ p and ρ are the mass densities of the particle and fluid, respectively, ν is the kinematic viscosity of the fluid, and t is the time. The electrophoretic mobility normalized by its steady-state value increases monotonically with increases in νt/a 2 and κa, but decreases monotonically with an increase in ρ p /ρ, keeping the other parameters unchanged. In general, a porous particle with a high fluid permeability trails behind an identical porous particle with a lower permeability and a corresponding hard particle in the growth of the normalized electrophoretic mobility The normalized electrophoretic acceleration of the porous sphere decreases monotonically with an increase in the time and increases with an increase in λa from zero at λa = 0.

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“…From the simulational side, the electrophoretic mobility of microgels has been computed in mean‐field approximation solving numerically the electrokinetic equations . In recent particle‐based simulations that include the pH effects, we observed that the electrophoretic mobility of a coarse‐grained nanogel quickly saturates as a function of degree of dissociation .…”

Section: Introductionmentioning

confidence: 99%

Influence of weak groups on polyelectrolyte mobilities

2019

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The ionization of dissociable groups in weak polyelectrolytes does not occur in a homogenous fashion. Monomer connectivity imposes constraints on the localization of the dissociated (charged) monomers that affect the local electric potential. As a result, the mean bare charge along a weak polyelectrolyte can vary depending on the proximity to topological features (e.g. presence of crosslinks or dangling ends). Using reaction‐ensemble Monte‐Carlo simulations we calculate the dissociation inhomogeneities for a few selected PE configurations, linear, rod‐like, flexible four‐arm star, and a star with stiff arms. An ensemble preaverage is used to obtain the annealed bare charge profile for these different polymer configurations. Using molecular dynamics simulations within a Lattice‐Boltzman fluid, we investigate how the electrophoretic mobility is affected by the bare charge inhomogeneities arising from the annealed weak polyelectrolytes. Surprisingly, the mobility obtained for the situations corresponding to the predicted charge profile for annealed weak polyelectrolytes are not significantly different than the mobility obtained when all the monomers have an identical charge (under the constraint that the total polyelectrolyte bare charge is the same). This is also true for the stiff rod‐like variants where conformational changes induced from the localization of the monomer charges are negligible. In salty solutions, we find that counterions are affected by the electric potential modulations induced by the topological features. Since the counterions crowd in regions where the electric potential caused by the dissociated monomers is highest, they wash‐out the bare charge inhomogeneities and contribute to a more uniform effective backbone charge.

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On electrophoresis of a pH‐regulated nanogel with ion partitioning effects

Cited by 10 publications

References 39 publications

Ion partitioning effect on the electrostatic interaction between two charged soft surfaces

Ion partitioning effect on the electrostatic interaction between two charged soft surfaces

Transient electrophoresis of a charged porous particle

Influence of weak groups on polyelectrolyte mobilities

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