The role of variable zeta potential on diffusiophoretic and diffusioosmotic transport

Lee, Saebom; Lee, Jinkee; Ault, Jesse T.

doi:10.1016/j.colsurfa.2022.130775

Cited by 15 publications

(15 citation statements)

References 87 publications

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“…It was previously observed that the electrolyte concentration inside the dead-end channel can influence the zeta potential of the particles, which further affects the dynamics of the particles. 15,19 Here, we observed stable zeta potential values throughout the experimental range after coating with polyelectrolytes, allowing for experimental investigation with a constant zeta potential of particles. Diffusiophoresis experiments were performed with one bilayer of PDADMAC/PSS-coated particles that were coated at varying salt concentrations during coating.…”

Section: Polyelectrolyte Adsorptionmentioning

confidence: 68%

“…For this reason, Shin et al showed that diffusiophoresis experiments in the dead-end channels could be used for low-cost zeta potentiometry. It is important to emphasize that estimating the average zeta potential in this manner does not necessarily give the exact penetration of the particles, since the zeta potential can change substantially with the electrolyte concentration in the dead-end channel. , …”

Section: Resultsmentioning

confidence: 99%

“…Other electrokinetic surface models such as constant surface charge or charge regulation models, , can be used to obtain different diffusiophoretic mobility expressions. Recently, Lee et al provided a guideline for selecting the most appropriate model (constant zeta potential, constant surface charge, or charge-regulation) for a given diffusiophoretic system. In this work, we study the effect of coating particles with polyelectrolytes in a layer-by-layer fashion.…”

Section: Introductionmentioning

confidence: 99%

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Diffusiophoretic Behavior of Polyelectrolyte-Coated Particles

Akdeniz,

Wood,

Lammertink

2024

Langmuir

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Diffusiophoresis, the movement of particles under a solute concentration gradient, has practical implications in a number of applications, such as particle sorting, focusing, and sensing. For diffusiophoresis in an electrolyte solution, the particle velocity is described by the electrolyte relative concentration gradient and the diffusiophoretic mobility of the particle. The electrolyte concentration, which typically varies throughout the system in space and time, can also influence the zeta potential of particles in space and time. This variation affects the diffusiophoretic behavior, especially when the zeta potential is highly dependent on the electrolyte concentration. In this work, we show that adsorbing a single bilayer (or 4 bilayers) of a polyelectrolyte pair (PDADMAC/PSS) on the surface of microparticles resulted in effectively constant zeta potential values with respect to salt concentration throughout the experimental range of salt concentrations. This allowed a constant potential model for diffusiophoretic transport to describe the experimental observations, which was not the case for uncoated particles in the same electrolyte system. This work highlights the use of simple polyelectrolyte pairs to tune the zeta potential and maintain constant values for precise control of diffusiophoretic transport.

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Section: Polyelectrolyte Adsorptionmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diffusiophoretic Behavior of Polyelectrolyte-Coated Particles

Akdeniz,

Wood,

Lammertink

2024

Langmuir

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“…We acknowledge that the singularity can be addressed by considering a concentration dependent electrolytic mobility. 61,69 For computational convenience, we refrain from incorporating a concentration dependent mobility relation. Second, if the concentration difference is relatively small, the two mobility relationships are equivalent; see Appendix A.…”

Section: Problem Setupmentioning

confidence: 99%

Two-dimensional diffusiophoretic colloidal banding: optimizing the spatial and temporal design of solute sinks and sources

2023

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“…2017; Gupta, Shim & Stone 2020 b ; Alessio et al. 2022; Lee, Lee & Ault 2022; Migacz & Ault 2022; Akdeniz, Wood & Lammertink 2023). For typical solutes with modest zeta potentials, the diffusioosmotic mobility, , can range from approximately to .…”

Section: Modelling Diffusioosmotic Dispersion In a Long Narrow Channelmentioning

confidence: 99%

Diffusioosmotic dispersion of solute in a long narrow channel

Teng,

Rallabandi,

Ault

2023

J. Fluid Mech.

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Solute–surface interactions have garnered considerable interest in recent years as a novel control mechanism for driving unique fluid dynamics and particle transport with potential applications in fields such as biomedicine, the development of microfluidic devices and enhanced oil recovery. In this study, we will discuss dispersion induced by the diffusioosmotic motion near a charged wall in the presence of a solute concentration gradient. Here, we introduce a plug of salt with a Gaussian distribution at the centre of a channel with no background flow. As the solute diffuses, the concentration gradient drives a diffusioosmotic slip flow at the walls, which results in a recirculating flow in the channel; this, in turn, drives an advective flux of the solute concentration. This effect leads to cross-stream diffusion of the solute, altering the effective diffusivity of the solute as it diffuses along the channel. We derive theoretical predictions for the solute dynamics using a multiple-time-scale analysis to quantify the dispersion driven by the solute–surface interactions. Furthermore, we derive a cross-sectionally averaged concentration equation with an effective diffusivity analogous to that from Taylor dispersion. In addition, we use numerical simulations to validate our theoretical predictions.

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The role of variable zeta potential on diffusiophoretic and diffusioosmotic transport

Cited by 15 publications

References 87 publications

Diffusiophoretic Behavior of Polyelectrolyte-Coated Particles

Diffusiophoretic Behavior of Polyelectrolyte-Coated Particles

Two-dimensional diffusiophoretic colloidal banding: optimizing the spatial and temporal design of solute sinks and sources

Diffusioosmotic dispersion of solute in a long narrow channel

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