Ion partitioning effect on the electrophoresis of a soft particle with hydrophobic core

Maurya, Saurabh Kumar; Gopmandal, Partha P.; Bhattacharyya, S.; Ohshima, Hiroyuki

doi:10.1103/physreve.98.023103

Cited by 35 publications

(23 citation statements)

References 32 publications

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“…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%

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

Sin

2022

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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: Introductionmentioning

confidence: 99%

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

Sin

2022

Preprint

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“…The effects of ion partitioning on the electrokinetics in soft nanochannels were analyzed in order to offset the existing work results with the consideration of equal permittivity inside and outside the ECL [22]. A large number of articles dealt with such effects in various research studies [23][24][25]. In this paper, however, we have not added the ion partitioning effect to present thruster systems since this consideration is repetitive.…”

Section: Introductionmentioning

confidence: 99%

Steric Effects on Space Electroosmotic Thrusters in Soft Nanochannels

2021

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The influence of steric effects on the performances of space electroosmotic thrusters (EOTs) was numerically delineated in soft nanochannels for which its walls are covered with polyelectrolyte materials. The size effect of the ionic species, namely the steric effect, is neglected in many previous research studies, but it has vital influences on electrostatic potential and electroosmotic velocity, which is further introduced into the present study in order to understand and improve the exploration of nano electroosmotic thrusters with soft channels. The thruster’s thrust, specific impulse, total input power, thruster efficiency and thrust-to-power ratio are computed based on finite difference methods. It is found that the thruster’s thrust and specific impulse increase with the steric parameter while the efficiency and thrust-to-power ratio possess opposite trends due to the enhancement of Joule heating dissipation. For real situations with the consideration of ion size, although the thruster’s thrust could be promoted, the efficiency is only 30–70%, and the peak values of thrust-to-power ratio fade away.

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“…Also, particle mobility expressions derived with assuming identical dielectric permittivity between core and shell phases are necessarily approximate in capturing the electrophoretic features of metallic or semiconducting particles functionalized with polymer coatings. Although there is an abundant literature on theory of electrophoresis for soft particles with simplified representation of dielectric permittivity distribution throughout the core and shell particle components, lesser attention has been paid to the elaboration of electrokinetic models for core-shell particles with account of dielectric-induced ions partitioning effects [39,40]. In addition, the internal particle core has been exclusively tackled with assuming insignificant permeation to ions and flow within it.…”

Section: Introductionmentioning

confidence: 99%

Effects of dielectric gradients‐mediated ions partitioning on the electrophoresis of composite soft particles: An analytical theory

2020

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In this work, we report original analytical expressions defining the electrophoretic mobility of composite soft particles comprising an inner core and a surrounding polymer shell with differentiated permeabilities to ions from aqueous background electrolyte and to fluid flow developed under applied DC field conditions. The existence of dielectric permittivity gradients operational at the core/shell and shell/solution interfaces is accounted for within the Debye-Hückel approximation and flat plate configuration valid in the thin double layer regime. The proposed electrophoretic mobility expressions, applicable to weakly to moderately charged particles with size well exceeding the Debye layer thickness, involve the relevant parameters describing the particle core/shell structure and the electrohydrodynamic features of the core and shell particle components. It is shown that the analytical expressions reported so far in literature for the mobility of hard (impermeable) or porous particles correspond to asymptotic limits of the more generic results detailed here. The impacts of dielectric-mediated effects of ions partitioning between bulk solution and particle body on the electrophoretic response are further discussed. The obtained expressions pave the way for a refined quantitative, analytical interpretation of electrophoretic mobility data collected on soft (nano)particles (e.g., functionalized dendrimers and multilayered polyelectrolytic particles) or biological cells (e.g., viruses) for which the classical hard core-soft shell representation is not appropriate.

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Ion partitioning effect on the electrophoresis of a soft particle with hydrophobic core

Cited by 35 publications

References 32 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

Steric Effects on Space Electroosmotic Thrusters in Soft Nanochannels

Effects of dielectric gradients‐mediated ions partitioning on the electrophoresis of composite soft particles: An analytical theory

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