Lubricated Surface in a Vertical Double‐Sided Architecture for Radiative Cooling and Atmospheric Water Harvesting

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 6, 2024

Abstract Radiative cooling significantly lowers condenser temperatures below ambient levels, enabling atmospheric water harvesting (AWH) without additional energy. However, traditional sky‐facing condensers have low power density, and droplets remain pinned on surface, requiring active condensate collection. To overcome these challenges, a lubricated surface (LS) coating—consisting of highly scalable polydimethylsiloxane elastomer with silicone oil—is introduced the side in vertical double‐sided architecture. The design not only effectively doubles local power, but also eliminates contact‐line pinning, passive, gravity‐driven collection water. Robust AWH is demonstrated from 30 × cm 2 sample outdoor environments (of varying humidity levels wind speeds different months) no artificial flow humidified air. In one test, passive rate LS coating reaches 21 g m −2 h −1 double that superhydrophobic 10 . indoor testing (20 °C 80% relative humidity), this system achieves condensation ≈87% theoretical limit up to 90% total passively collected. approach effective decentralized removes need for piping infrastructure external energy input.

Language: Английский

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Drop impact dynamics on hierarchically textured lubricant-infused surfaces

Physical Review Fluids, Journal Year: 2025, Volume and Issue: 10(1)

Published: Jan. 21, 2025

Language: Английский

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Wetting Ridge Growth Dynamics on Textured Lubricant-Infused Surfaces

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Understanding droplet-surface interactions has broad implications in microfluidics and lab-on-a-chip devices. In contrast to droplets on conventional textured air-filled superhydrophobic surfaces, water state-of-the-art lubricant-infused surfaces are accompanied by an axisymmetric annular wetting ridge, the source nature of which not clearly established date. Generally, imbalance interfacial forces at contact line is believed play a pivotal role accumulating lubricant oil near droplet base form ridge. this study, we experimentally characterize model ridge that plays crucial mobility. We developed geometry-based analytical steady-state shape validated using experiments numerical simulations. Our shows steady state (1) radius ≈30% higher than radius, (2) rises halfway (3) volume half (≈50%) volume, (4) does depend viscosity used for impregnation. The insights gained from work improve our mechanistic understanding dynamics.

Language: Английский

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Droplets Dance After They Merge

Physics, Journal Year: 2024, Volume and Issue: 17

Published: Feb. 1, 2024

Water droplets can exhibit complex collective motions when they condense on a thin oil film.

Language: Английский

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Dancing drops on lubricated surfaces

Physical Review Fluids, Journal Year: 2024, Volume and Issue: 9(11)

Published: Nov. 22, 2024

This paper is associated with a video winner of 2023 American Physical Society's Division Fluid Dynamics (DFD) Gallery Motion Award for work presented at the DFD Motion. The original available online Motion, Published by Society 2024

Language: Английский

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Rapid water drainage on human eyelashes of a hydrophobic Brachistochrone fiber array

Science Advances, Journal Year: 2024, Volume and Issue: 10(51)

Published: Dec. 20, 2024

Numerous organisms exploit asymmetrical capillary forces generated by unique fiber or tapered structures to rapidly eliminate undesired liquid for survival in moist rainy habitats. Human eyelashes, the primary protector of eyes, use a yet-to-be-fully-understood mechanism efficiently transfer incoming vision safeguarding. Here, we elucidate that human eyelashes featuring hydrophobic curved flexible array with surface micro-ratchet and macro-curvature approximating Brachistochrone is adept at directionally expelling maintain clear vision. These structural attributes are sequentially used drainage, starting from anisotropic retention via micro-ratchet, followed elastic expulsion among deflected arrays culminating fastest sliding off along path, which together reduce contact time about 20% on rigid linear slopes. Investigating intricate relationship between multistructure draining efficiency may inspire design advanced liquid-repelling edges outdoor devices dryness.

Language: Английский

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Phase change material infused surfaces for thermo-responsive condensation heat transfer for effective thermal management

International Communications in Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: 161, P. 108509 - 108509

Published: Dec. 26, 2024

Language: Английский

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