Unidirectional drying of a suspension of diffusiophoretic colloids under gravity

Xu, Jinjie; Wang, Zhikui; Chu, Henry

doi:10.1039/d3ra00115f

Cited by 3 publications

(4 citation statements)

References 82 publications

(160 reference statements)

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“…(2022) and Xu et al. (2023). These works use two key assumptions in deriving an averaged 1-D particle transport model.…”

Section: Consequences For Diffusiophoretic Particle Transportmentioning

confidence: 96%

“…Finally, in this section we briefly remark on the feasibility of extending this Taylor-dispersion-style averaged analysis to the motion of suspended colloidal particles that also experience diffusiophoresis. As mentioned above, this idea has been the focus of several recent research works including Chu et al (2021), Chu et al (2022), Alessio et al (2022) and Xu et al (2023). These works use two key assumptions in deriving an averaged 1-D particle transport model.…”

Section: Consequences For Diffusiophoretic Particle Transportmentioning

confidence: 99%

“…Later, Chu et al (2022) built on their previous work and showed that hydrodynamic flows can reduce the so-called 'superdiffusion' of solute-repelled colloids and enhance the spreading of solute-attracted colloids in their system. Xu, Wang & Chu (2023) investigated the advective-diffusive transport of an electrolyte-colloid suspension in a drying cell with the dynamics driven by evaporation and gravity. They also developed an effective 1-D macrotransport model to predict scalings for the transport of the particles.…”

Section: Introductionmentioning

confidence: 99%

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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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“…(2022) and Xu et al. (2023). These works use two key assumptions in deriving an averaged 1-D particle transport model.…”

Section: Consequences For Diffusiophoretic Particle Transportmentioning

confidence: 96%

Section: Consequences For Diffusiophoretic Particle Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diffusioosmotic dispersion of solute in a long narrow channel

Teng,

Rallabandi,

Ault

2023

J. Fluid Mech.

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“…The diffusioosmotic flow velocity follows the ‘log-sensing’ relation, u = M ∇ log n , 8 where n is the ion concentration and a positive (negative) diffusioosmotic mobility M corresponds to fluid driven up (down) the solute gradient. Diffusioosmosis has received much attention in recent years due to its impact on a wide range of applications, such as mixing and separation, 9–36 reverse electrodialysis, 37–42 and enhanced oil recovery. 43–47…”

Section: Introductionmentioning

confidence: 99%

Diffusioosmotic flow reversals due to ion–ion electrostatic correlations

Zhang,

Chu

2024

Nanoscale

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Inkjet printing on hydrophobic surfaces: Controlled pattern formation using sequential drying

Naderi,

Sheuten,

Amirfazli

et al. 2023

The Journal of Chemical Physics

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Inkjet-printed micro-patterns on hydrophobic surfaces have promising applications in the fabrication of microscale devices such as organic thin-film transistors. The low wettability of the surface prevents the inkjet-printed droplets from spreading, connecting to each other, and forming a pattern. Consequently, it is challenging to form micro-patterns on surfaces with low wettability. Here, we propose a sequential printing and drying method to form micro-patterns and control their shape. The first set of droplets is inkjet-printed at a certain spacing and dried. The second set of droplets is printed between these dry anchors on the surface with low wettability. As a result, a stable bridge on the surface with low wettability forms. This printing method is extended to more complicated shapes such as triangles. By implementing an energy minimization technique, a simple model was devised to predict the shape of the inkjet-printed micro-patterns while confirming that their equilibrium shape is mainly governed by surface tension forces. The gradient descent method was utilized with parametric boundaries to emulate droplet pinning and wettability of the anchors and to prevent convergence issues from occurring in the simulations. Finally, the energy minimization based simulations were used to predict the required ink to produce dry lines and triangles with smooth edges.

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Unidirectional drying of a suspension of diffusiophoretic colloids under gravity

Abstract: We conduct numerical simulations and develop a macrotransport theory to show a diffusiophoresis-based, order-of-magnitude enhancement in the thickness of the colloidal layer produced by unidirectional drying of an electrolyte-colloid suspension.

Cited by 3 publications

References 82 publications

Diffusioosmotic dispersion of solute in a long narrow channel

Diffusioosmotic dispersion of solute in a long narrow channel

Diffusioosmotic flow reversals due to ion–ion electrostatic correlations

Inkjet printing on hydrophobic surfaces: Controlled pattern formation using sequential drying

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