Suppression of wetting transition on evaporative fakir droplets by using slippery superhydrophobic surfaces with low depinning force

Shamim, Jubair A.; Takahashi, Yukinari; Goswami, Abir; Shaukat, Nadeem; Hsu, Wei-Lun; Choi, Junho; Daiguji, Hirofumi

doi:10.1038/s41598-023-29163-1

Cited by 4 publications

(1 citation statement)

References 62 publications

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“…[ 56 ] Similarly, mechanical analysis can be utilized to assess the resistance of different structural models to applied forces, which is instructive for the design of surfaces with stable C states. [ 57 ]…”

Section: Fundamental Understanding Of Superhydrophobicitymentioning

confidence: 99%

The Challenge of Superhydrophobicity: Environmentally Facilitated Cassie–Wenzel Transitions and Structural Design

Zhong,

Xie,

Guo

2023

Advanced Science

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Superhydrophobic materials can be used in various fields to optimize production and life due to their unique surface wetting properties. However, under certain pressure and perturbation conditions, the droplets deposited on superhydrophobic materials are prone to change from Cassie state to Wenzel state, which limits the practical applications of the materials. In recent years, a large number of works have investigated the transition behavior, transition mechanism, and influencing factors of the wetting transition that occurs when a superhydrophobic surface is under a series of external environments. Based on these works, in this paper, the phenomenon and kinetic behavior of the destruction of the Cassie state and the mechanism of the wetting transition are systematically summarized under external conditions that promote the wetting transition on the material surface, including pressure, impact, evaporation, vibration, and electric wetting. In addition, superhydrophobic surface morphology has been shown to directly affect the duration of the Cassie state. Based on the published work the effects of specific morphology on the Cassie state, including structural size, structural shape, and structural level, are summarized in this paper from theoretical analyses and experimental data.

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Section: Fundamental Understanding Of Superhydrophobicitymentioning

confidence: 99%

The Challenge of Superhydrophobicity: Environmentally Facilitated Cassie–Wenzel Transitions and Structural Design

Zhong,

Xie,

Guo

2023

Advanced Science

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Predicting contact angles in the Cassie–Baxter state using a double-radius-contour method

Liu,

Zhen,

Yan

et al. 2024

Physics of Fluids

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Hydrophobic surfaces exhibit unique surface effects and hold broad potential across numerous domains, including anti-icing, condensation, and self-cleaning. Conventionally, droplets on hydrophobic surfaces have been conceptualized as spherical segments to predict contact angles. However, a droplet deposited on hydrophobic surfaces tends to be flattened at the bottom due to gravity, leading to a discrepancy between the experimental observation and prediction derived from the Cassie–Baxter equation. Here, we propose an approximation that divides the distorted droplet into upper and lower segments, i.e., simplifying its morphology into a double-radius contour. This approach leads to a more accurate prediction of the contact angle on hydrophobic structured surfaces. The deviation between experiment and our model is less than 1.7%. Further water evaporation was conducted to investigate the transition condition from the Cassie–Baxter state to the Wenzel state, and we show that the critical transition radius for substrates with varied microstructural geometry parameters consistently falls slightly below the theoretical prediction, which is attributed to an inaccurate assessment of the structure angle. Finally, we demonstrate that the stability of the Cassie–Baxter state can be enhanced by employing hierarchical micro-/nanostructures on the surface. This research advances our foundational comprehension of wetting phenomenon and the stability of the Cassie–Baxter state.

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Interface Equilibrator: Numerical solutions to capillarity and wetting equilibrium and quasi-equilibrium problems

Soligno

2024

Physics of Fluids

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This paper introduces Interface Equilibrator (IE), a new graphical-user-interface software for simulating the equilibrium shape of fluid–fluid interfaces in a wide range of wetting and capillarity problems. IE provides an easy-to-use three-dimensional computer-aided-design environment to define the problem's geometry (i.e., the solid surfaces and the fluids' volumes), by simply loading opportune triangular meshes, and chemistry, by selecting the value of the relevant experimental parameters (e.g., Young's contact angle). No other input is required. Then, IE calculates the fluid–fluid interface's equilibrium shape using a novel numerical methodology, presented in this paper, that consists in an energy-minimization Monte Carlo simulation alongside other built-in automated methods to, e.g., refine the fluid–fluid interface mesh according to its local curvature and polish it. The energy-minimization algorithm is based on a numerical approach introduced a few years ago [Soligno et al., “The equilibrium shape of fluid-fluid interfaces: Derivation and a new numerical method for Young's and Young–Laplace equations,” J. Chem. Phys. 141, 244702 (2014)] that is generalized here to handle unconstructed meshes with any topology and to include also new types of forces (e.g., due to a rotating system or to a line tension). In addition, several illustrative and scientifically interesting novel results are presented in this paper to demonstrate IE's versatility and capability of addressing a broad spectrum of research problems, relevant for many technological applications, such as microfluidics, fluid management at various length scales, printing, colloids, soldering for chip manufacture, etc. Finally, the paper reports numerous validation tests, where known analytic or numerical solutions are compared with IE's results to verify the correctness and accuracy of IE's calculations.

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Suppression of wetting transition on evaporative fakir droplets by using slippery superhydrophobic surfaces with low depinning force

Cited by 4 publications

References 62 publications

The Challenge of Superhydrophobicity: Environmentally Facilitated Cassie–Wenzel Transitions and Structural Design

The Challenge of Superhydrophobicity: Environmentally Facilitated Cassie–Wenzel Transitions and Structural Design

Predicting contact angles in the Cassie–Baxter state using a double-radius-contour method

Interface Equilibrator: Numerical solutions to capillarity and wetting equilibrium and quasi-equilibrium problems

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