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Modeling the Wettability of Microstructured Hydrophobic Surface Using Multiple-relaxation-time Lattice Boltzmann Method

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Journal of Bionic Engineering 2022年第5期19卷 1460-1471页

作者： Lei Tian Liuchao Qiu College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China

Wetting properties are significant for a hydrophobic surface and normally characterized by the equilibrium contact angle.In this manuscript,a mesoscopic method based on multiphase multiple-relaxation-time Lattice Boltzmann method has been presented and applied to simulate the contact angle at three-phase interfaces of a solid surface with micro-pillar structure.The influence of different parameters including pillar height,pillar width,inter-pillar spacing,intrinsic contact angle and the volume of the liquid drop on the equilibrium contact angle has been comprehensively investigated.The effect of geometry parameters of the micro-pillar structure on the wetting transition from Cassie–Baxter state to wenzel state has also been studied.The results indicate that when the inter-pillar spacing is less than a certain value or the pillar height is greater than a certain value,the contact form between the droplet and the surface satisfies the Cassie–Baxter state.When the contact form satisfies the Cassie–Baxter state,the contact angle gradually increases with the increase of the inter-pillar spacing;the contact angle does not change significantly with the pillar height;the contact angle gradually decreases and approaches the intrinsic contact angle with the pillar width increases.Moreover,the contact angle increases with the increase of the intrinsic contact angle,and the contact angle is not sensitive to the change of droplet volume when the droplet volume is between 0.5 and10μl.

关键词： Bioinspired hydrophobic surface Wettability Cassie-Baxter state wenzel state Lattice Boltzmann method Mesoscale simulation

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Controlling DNA Bundle Size and Spatial Arrangement in Selfassembled Arrays on Superhydrophobic Surface

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Nano-Micro Letters 2015年第2期7卷 146-151页

作者： Gabriele Ciasca Massimiliano Papi Valentina Palmieri Michela Chiarpotto Simone Di Claudio Adele De Ninno Ennio Giovine Gaetano Campi Annamaria Gerardino Luca Businaro Marco De Spirito Istituto di Fisica Universitá Cattolica SC L.go Francesco Vito 100168 Rome Italy Istituto di Fotonica e Nanotecnologie-CNR Via Cineto Romano 42 00156 Rome Italy Institute of Crystallography-CNR Via Salaria Km 290016 Monterotondo Rome Italy

The use of superhydrophobic surfaces(SHSs) is now emerging as an attractive platform for the realization of one-dimensional(1D) nanostructures with potential applications in many nanotechnological and biotechnological fields.To this purpose, a strict control of the nanostructures size and their spatial arrangement is highly required. However, these parameters may be strongly dependent on the complex evaporation dynamics of the sessile droplet on the SHS. In this work, we investigated the effect of the evaporation dynamics on the size and the spatial arrangement of self-assembled 1D DNA bundles. Our results reveal that different arrangements and bundle size distributions may occur depending on droplet evaporation stage. These results contribute to elucidate the formation mechanism of 1D nanostructures on SHSs.

关键词： Superhydrophobicity DNA array Cassie state wenzel state 1D nanostructures Self-assembly

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