Wetting of a liquid annulus in a capillary tube

Lv, Cunjing; Hardt, Steffen

doi:10.1039/d0sm00346h

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…volume conservation, contact angle, pinning of the contact line). The SE has been widely applied to studying various interfacial phenomena (such as morphologies of droplets and particles (Cho et al 2005;Crawford, Lim & Gradecak 2013;Lv et al 2014;Dević et al 2019;Lv & Hardt 2021;Chu et al 2023), foams (Kabla & Debregeas 2007) as well as the equilibrium configuration of biomembranes (Michalet 2007;Sakashita et al 2012), with excellent agreement with experimental results. However, for our problem, SE could only simulate static or quasi-static problems and could not take dynamic behaviour into consideration.…”

Section: Surface Evolver Simulationmentioning

confidence: 79%

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Edge-driven collapse of fluid holes

Zhao,

Zhang,

2023

J. Fluid Mech.

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We study the stability and collapse of holes at the wall in liquid layers on circular bounded containers with various wettabilities. Three distinct wetting modes of the hole are observed, which are related to the wettability of the container: when the substrate and the inner wall of the container are superhydrophobic, a stable hole remains as the liquid volume is continuously increased until the liquid layer covers the entire substrate; when the substrate and the inner wall are hydrophobic, an eye-shaped hole remains stable as the projected area of the hole exceeds a critical value $A_c$ , however, the hole collapses if the liquid volume is further increased; when the substrate is superhydrophobic but the wall is hydrophilic, on increasing the liquid volume, the hole suddenly transfers into a circular hole and is pushed against the wall, leaving the hole dwelling around the centre of the container. Theoretical analyses and numerical simulations are conducted to establish the phase diagram for different wetting modes. It is found that, in the second mode, $A_c$ increases with the size of the container but decreases with the contact angle of the substrate and the wall. Furthermore, we experimentally investigate the dynamics of the hole. The time evolution of the area of the hole obeys a scaling relationship $A \sim (t_0 - t)^{1.1}$ after the hole collapses at time $t_0$ .

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Section: Surface Evolver Simulationmentioning

confidence: 79%

“…2014; Dević et al. 2019; Lv & Hardt 2021; Chu et al. 2023), foams (Kabla & Debregeas 2007) as well as the equilibrium configuration of biomembranes (Michalet 2007; Sakashita et al.…”

Section: Numerical Studymentioning

confidence: 99%

Edge-driven collapse of fluid holes

Zhao,

Zhang,

2023

J. Fluid Mech.

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“…The method can also be used to deal with more complicated problems, e.g. dynamic wetting on soft substrates or other geometries ( [11,34]). These problems will be left for future work.…”

Section: Discussionmentioning

confidence: 99%

Self-propulsion dynamics of small droplets on general surfaces with curvature gradient

Chen,

2021

Preprint

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We study theoretically the self-propulsion dynamics of a small droplet on general curved surfaces by a variational approach. A new reduced model is derived based on careful computations for the capillary energy and the viscous dissipation in the system. The model describes quantitatively the spontaneous motion of a liquid droplet on general surfaces. In particular, it recovers previous models for droplet motion on the outside surface of a cone. In this case, we derive a scaling law of the displacement s ∼ t 1/3 of a droplet with respect to time t by asymptotic analysis. Theoretical results are in good agreement with experiments in previous literature without adjusting the friction coefficient in the model.

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“…Today, the usage of porous membranes is increasingly prevalent due to the low ion diffusion coefficient and fewer tunable factors in the solution-diffusion process. For ion passage through these membranes, nanochannels with distinct properties may be used …”

Section: Introductionmentioning

confidence: 99%

Enhanced Ionic Current Rectification through Innovative Integration of Polyelectrolyte Bilayers and Charged-Wall Smart Nanochannels

2022

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The tools utilized by humans continue to shrink and speed up. Lab-on-a-chip (LOC) is one of the most recent techniques for decreasing the size of chemical systems. Today, LOCs have made substantial strides in developing nanomaterial fabrication techniques. Controlling and regulating the fluid and ion mobility in these systems is crucial. Layer-by-layer (LBL) soft layers are one of the most effective strategies for controlling fluid flow in channels. In light of the present constraints for developing these systems and the high expense of experimental investigations, it is vital to employ modeling to minimize costs and comprehend their underlying ideas and operations. In this study, we examined the influence of the LBL soft layer's presence in the charged nanochannels on the ion transport parameters. To examine the effect of the coating length of the LBL soft layer, we first examined three lengths of coating: one with a length greater than half (type (I)), one with a length equal to half (type (II)), and one with a length less than half (type (III)) of the nanochannel length. Then, by solving Poisson−Nernst−Planck and Navier−Stokes equations, we determined the influences of pH, soft layer charge density (N PEL /N A ), bulk concentration (C 0 ), and hard surface charge density (σ) on the ionic current rectification (R f ) and selectivity (S) of the nanochannel. The maximum rectification of 30.65 was achieved using a nanochannel of type (III) and σ = +10 mC/m 2 . The current results demonstrate a promising hybrid architecture consisting of an LBL soft layer and a smart charged nanochannel for enhanced rectification.

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Wetting of a liquid annulus in a capillary tube

Abstract: In this paper, we systematically investigate the static wetting behavior of a liquid ring in a cylindrical capillary tube.

Cited by 8 publications

References 45 publications

Edge-driven collapse of fluid holes

Edge-driven collapse of fluid holes

Self-propulsion dynamics of small droplets on general surfaces with curvature gradient

Enhanced Ionic Current Rectification through Innovative Integration of Polyelectrolyte Bilayers and Charged-Wall Smart Nanochannels

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