DataVXAdvanced MaterialsPaper
journal article·2024-12Open access

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

Shakeel Ahmad, Abdul Rahim Siddiqui, Kaijie Yang, Ming Zhou, Hafiz Muhammad Ali, Rifan Hardian, Gyorgy Szekely, Dan Daniel, Shu Yang, Qiaoqiang Gan

Advanced Materials· Volume 36· Issue 51
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Source abstract

Abstract

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 cooling power density, and water droplets remain pinned on surface, requiring active condensate collection. To overcome these challenges, a lubricated surface (LS) coating—consisting of highly scalable polydimethylsiloxane elastomer lubricated with silicone oil—is introduced on the condenser side in a vertical double‐sided architecture. The design not only effectively doubles the local cooling power, but also eliminates contact‐line pinning, enabling passive, gravity‐driven collection of water. Robust AWH is demonstrated from a 30 × 30 cm2 sample in outdoor environments (of varying humidity levels and wind speeds in different months) and with no artificial flow of humidified air. In one outdoor test, the passive water collection rate of LS coating reaches 21 g m−2 h−1 double that on superhydrophobic surface, 10 g m−2 h−1. In indoor testing (20 °C and 80% relative humidity), this system achieves a condensation rate ≈87% of the theoretical limit with up to 90% of the total condensate passively collected. this approach achieves effective AWH in a decentralized approach that removes the need for piping infrastructure and external energy input.
Source: crossref · Quality: baseline

Research context

Polymers

OpenAlex topics: Thermal Radiation and Cooling Technologies · Urban Heat Island Mitigation · Solar-Powered Water Purification Methods

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Sustainable Photonics Energy Research Laboratory, Material Science Engineering, Division of Physical Sciences and Engineering (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia

Department of Electrical Engineering Stanford University Stanford CA 94305 USA

Mechanical Engineering Department King Fahd University of Petroleum and Minerals Dharan 31261 Saudi Arabia

Interdisciplinary Research Center for Sustainable Energy Systems (IRC‐SES) King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia

Advanced Membranes and Porous Materials Center, Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia

Chemical Engineering Program, Physical Science and Engineering Division King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia

Droplet Lab, Mechanical Engineering, PSE KAUST Thuwal 23955‐6900 Saudi Arabia

Department of Materials Science and Engineering University of Pennsylvania 3231 Walnut Street Philadelphia PA 19104 USA

Environmental Engineering Program, BESE KAUST Thuwal 23955‐6900 Saudi Arabia

Funding

King Abdullah University of Science and Technology · Futurewei Technologies

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