Effect of ion partitioning on electrostatics of soft particles with volumetrically charged inner core coated with pH-regulated polyelectrolyte layer

Ganjizade, Ardalan; Sadeghi, Arman; Ashrafizadeh, Seyed Nezameddin

doi:10.1016/j.colsurfb.2018.05.053

Cited by 30 publications

(19 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is given as:

in which r ± is the hydrated radius of ionic species. In the symmetric salt solution, for instance KCL solution, the hydrated radii of ions is assumed to be the same, namely, r + = r − = r [ 37 , 42 , 43 , 45 ]. Substituting Equations (3)–(7) into Equations (1) and (2), we have:

…”

Section: Mathematical Model Analysismentioning

confidence: 99%

“…When the PEL is dense, there is a different tendency of ions to accumulate between within and outside the polyelectrolyte layer so that its permittivity is smaller than the one of the electrolyte solution layer, which leads to major variations in the ionic concentration distribution. Under such a circumstance, the ions are rearranged in the soft channel, which is called the ion partitioning effect [ 36 , 37 ]. Barbosa et al [ 38 ] analyzed the ion partition and membrane potential using the Poisson–Boltzmann equation and observed concentration of ions inside the cell.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Space Electroosmotic Thrusters in Ion Partitioning Soft Nanochannels

Zheng

Jian

2021

Micromachines

View full text Add to dashboard Cite

Space electroosmotic thrusters (EOTs) are theoretically investigated in a soft charged nanochannel with a dense polyelectrolyte layer (PEL), which is considered to be more realistic than a low-density PEL. When the PEL is dense, its permittivity is smaller than the one of the electrolyte solution layer, leading to rearrangement of ions in the channel, which is denoted as the ion partitioning effect. It is noted that fluid viscosity becomes high within the PEL owing to the hydration effect. An analytical solution for electroosmotic velocity through the channel is obtained by utilizing the Debye–Hückel linearization assumption. Based on the fluid motion, thruster performances, including thrust, specific impulse, thrust-to-power ratio, and efficiency, are calculated. The ion partitioning effect leads to enhancement of the thruster velocity, while increase of the dynamic viscosity inside the PEL reduces the flow rate of the fluid. Therefore, these performances are further impacted by the dense soft material, which are discussed in detail. Moreover, changes or improvements of the thruster performances from the dense PEL to the weak PEL are presented and compared, and distributions of various energy items are also provided in this study. There is a good result whereby the increase in electric double layer thickness promotes the development of thruster performances. Ultimately, the simulated EOTs produce thrust of about 0 to 20 μN and achieve thruster efficiency of 90.40%, while maintaining an appropriate thrust–power ratio of about 1.53 mN/W by optimizing all design parameters.

show abstract

“…It is given as:

…”

Section: Mathematical Model Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Space Electroosmotic Thrusters in Ion Partitioning Soft Nanochannels

Zheng

Jian

2021

Micromachines

View full text Add to dashboard Cite

show abstract

“…Based on the Boltzmann distribution of ions, Ganjizade et al. analyzed the impact of the ion partitioning effect on the electrostatic of a soft particle with a volumetrically charged core covered by a pH‐regulated polyelectrolyte layer. They observed that if the permittivities of two adjacent media differ, a change in the slope of the electrostatic potential profile at the interface develops.…”

Section: Introductionmentioning

confidence: 99%

“… studied the ion partitioning effect on electrophoresis of a soft particle through the Debye‐Hückel approximation under a thin Debye layer consideration. All these studies suggest that the ion partitioning effect is an important electrokinetic phenomenon involving two neighboring media with different dielectric permittivity. Previous studies dealing with the ion partitioning effect on electrophoresis neglected the double layer polarization and relaxation effects thus, valid for the low charge and weak electric field condition with thinner Debye layer assumption.…”

Section: Introductionmentioning

confidence: 99%

“…López-García et al [30] numerically investigated the effect of ion partitioning by solving the Poisson-Boltzmann equation for a suspended spherical particle covered by a permeable membrane layer bearing inhomogeneous fixed charge distribution. Based on the Boltzmann distribution of ions, Ganjizade et al [31] analyzed the impact of the ion partitioning effect on the electrostatic of a soft particle with a volumetrically charged core covered by a pH-regulated polyelectrolyte layer. They observed that if the permittivities of two adjacent media differ, a change in the slope of the electrostatic potential profile at the interface develops.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2018

View full text Add to dashboard Cite

The electrophoresis of a polyelectrolyte nanoparticle, whose charge condition depends on the salt concentration and pH of the suspended medium as well as the dielectric permittivity difference, is analyzed. The present nonlinear model for the electrophoresis of this pH-regulated polyelectrolyte (PE) particle is based on the consideration of full set of governing equations of fluid and ion transport coupled with the equation for electric field. The Born energy of the ions are incorporated to account for the difference in the dielectric permittivity of the PE and the electrolyte. The governing equations are computed numerically through a control volume approach. The nonlinear effects are highlighted by comparing with the existing linear model as well as results based on the first-order perturbation analysis valid for a weak applied field. The ion partitioning effect arising due to the difference in self energy of ions between the two media, have a strong impact on the mobility of the PE. The ion partitioning effect attenuates the penetration of counterions in the PE, which enhances the electric force and hence, results in a larger mobility of the PE. The nonlinear effects due to the double layer polarization and relaxation are intensified due to the ion partitioning effect. The ion partitioning effect influences the association/dissociation of PE functional group by tuning the hydrogen/hydroxide ions. Present study shows that the ion partitioning effect is profound for higher salt concentration and/or higher volume density of PE functional groups.

show abstract

Electrophoresis of spherical soft particles in electrolyte solutions: A review

et al. 2019

View full text Add to dashboard Cite

Theories on the electrophoresis of spherical soft particles suspended in an electrolyte solution are thoroughly reviewed. The review predominantly covers studies on the electrophoresis in dilute and concentrated suspensions as well as bounded media, carried out mainly during the past two decades. Moreover, studies on the electrostatics of soft particles are also surveyed. Finally, the research gaps and prospects of the electrophoresis of soft particles are presented.

show abstract

Effect of ion partitioning on electrostatics of soft particles with volumetrically charged inner core coated with pH-regulated polyelectrolyte layer

Cited by 30 publications

References 22 publications

Space Electroosmotic Thrusters in Ion Partitioning Soft Nanochannels

Space Electroosmotic Thrusters in Ion Partitioning Soft Nanochannels

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

Electrophoresis of spherical soft particles in electrolyte solutions: A review

Contact Info

Product

Resources

About