Droplet impact and rebound dynamics on superhydrophobic surfaces

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)

Published: July 1, 2024

The impact and rebound dynamics of droplets on superhydrophobic surfaces were investigated through numerical analysis employing the phase field method. influences contact angle, velocity, surface tension, dynamic viscosity fields pressure velocity as well spreading factor central height described comprehensively. results indicate that there are a series stages impingement, spreading, transition, retraction, in order throughout life cycle droplet. droplet exhibits distinct profiles upon impingement stage, with maximum at lower center higher velocities upper periphery, around. Velocities predominantly upward, peaking bottom during stage. A larger viscosity, contribute to reduced factor. Deposition is more likely occur when tension lower, larger. Droplets tend Thresholds for delineated rebound. Furthermore, correlation predicting was proposed.

Language: Английский

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Droplet impact dynamics on different wettable surfaces at moderate Weber numbers

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: 695, P. 134250 - 134250

Published: May 12, 2024

Language: Английский

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Steerable droplet precise bouncing on a superhydrophobic surface with superhydrophilic stripes

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(3)

Published: July 15, 2024

The precise rebound of a droplet upon hitting solid surface has garnered significant attention in recent years due to its critical applications self-cleaning, printing industries, and the design heat exchanger surfaces, among others. This study introduces an innovative approach that combines femtosecond laser processing with high-temperature stearic acid modification create surfaces feature superhydrophilic (SHL) stripes on superhydrophobic substrate. By controlling offset distance between droplet's impact point SHL stripe, we achieved directional droplets. Our findings indicate lateral displacement increases always tilts toward direction stripe. also incorporates numerical simulations validate findings, shedding light energy conversion mechanisms at liquid–solid interface during impact, particularly retraction phase. discovery is for more accurately predicting specific landing spots rebounding

Language: Английский

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Biomimetic heat-localized and solar absorption-enhanced hollow structural nanofibrous membrane for clean water production from saline water and dye wastewater

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 678, P. 1112 - 1124

Published: Sept. 13, 2024

Language: Английский

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B–O Bond Reinforced Mechanical Stability of Alginate-Based Jammed Emulsion for Enhancing Pesticide Droplet Foliar Deposition

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: 13(1), P. 447 - 460

Published: Jan. 1, 2025

Pickering emulsions (PEs) make an important contribution to the development of stable, sustainable, biosafe, and controlled-release pesticide formulations due their designable interfacial film structure efficient encapsulation capability. However, poor mechanical stability PEs induces droplet splashing while impacting superhydrophobic surfaces, which is not in line with sustainable strategy agriculture. Herein, a cleaner production jammed emulsion was constructed using amphiphilic alginate-based derivatives (Ugi-Alg) functionalized SiO2 (SN-CPA). As anticipated, deposition, stability, persistence, have been improved, significantly reducing need for repeated applications risk environmental contamination. The impact dynamics calculations demonstrate dominant role jamming sacrificial bond synergies promoting high-speed deposition. transmission decreased from 40.8% unjammed 10.3%, improved. Additionally, after rainwater washing, effective control rate Botrytis cinerea reached approximately 87%. Notably, pH-response B–O bonds endows In addition, biosafety assessment indicated that did affect height strawberry seedlings short term. Therefore, this review highlights potential improve utilization efficiency increase biocompatibility, thus providing innovative strategies agricultural design.

Language: Английский

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The effect of retraction-rebound dynamics on the contact time of rebounding-coalescing droplets on a superhydrophobic surface with or without a macro-ridge

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

The effect of retraction-rebound dynamics on the contact time rebounding-coalescing droplets is investigated via lattice Boltzmann simulation method a superhydrophobic surface with or without macro-ridge. result shows that retraction transition from asymmetric to symmetric triggered by increased Weber number, when droplet split not ridge. Under non-split and conditions, rebound mode involves asymmetric/symmetric, asymmetric/symmetric ridge, right–left non-simultaneous/simultaneous rebound. these modes, coalescence-spreading stage compressed thus being earlier resulting in enhanced On contrary, rotation promoted angular momentum, is, enhance Because droplet, always reduced number two surfaces.

Language: Английский

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Dynamic host–guest/π–π multiple bonds of alginate-based super-amphiphiles reinforced the mechanical stability and foliar deposition of jammed emulsion droplet

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 505, P. 159377 - 159377

Published: Jan. 9, 2025

Language: Английский

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Reconsideration on the maximum deformation of droplets impacting on solid surfaces

Droplet, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Droplet impact on solid surfaces is widely involved in diverse applications such as spray cooling, self‐cleaning, and hydrovoltaic technology. Maximum solid‒liquid contact area yielded by droplet spreading one key parameter determining energy conversion between droplets surfaces. However, for the maximum deformation of droplets, length width are usually mixed indiscriminately, resulting unignored prediction errors area. Herein, we investigate highlight difference width. The never smaller than length, appears once angle exceeds 90° (which becomes more significant superhydrophobic surfaces), regardless velocities, liquid viscosities, system scales (from macroscale to nanoscale). A theoretical model analyzing structure rim proposed demonstrate quantitatively predict above difference, agreeing well with experimental results. Based molecular dynamics simulations, analysis further extended scenario nanodroplets impacting Reconsideration underscores often‐overlooked yet values width, which crucial involving droplet‒interface interactions.

Language: Английский

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Introduction to bioinspiration and biomimetics in pavement construction

Elsevier eBooks, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 23

Published: Jan. 1, 2025

Language: Английский

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Biomimetic Janus Particles Induced In Situ Interfacial Remineralization for Dentin Hypersensitivity

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract Dentin hypersensitivity (DH), caused by the exposure of dentin tubules, is a common complaint dental patients. Although occlusion exposed tubules primary treatment approach, complex oral environment, and multiple simultaneous requirements often hinder its implementation. In this study, strawberry‐shaped hemispheric Janus particles (JPs) are synthesized, their use in DH evaluated vitro an animal model. The side JPs modified with polymers quaternary ammonium salts (QASs) to form superhydrophobic coating antibiofilm properties, while flat catechol groups able strong bonds dentin. Even after 1 h ultrasonication or 1000 rounds thermal cycling, completely occluded JPs. Moreover, biofilm formation not observed, area living bacteria less than 1% compared blank control sodium fluoride (NaF)‐treated groups. rat model, fixed specimens at day 3, much earlier obtained commonly used NaF. These results demonstrate that can provide novel approach DH.

Language: Английский

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