Please use this identifier to cite or link to this item: https://doi.org/10.1021/acsomega.9b03349
Title: Laser-Induced Wettability Gradient Surface of the Aluminum Matrix Used for Directional Transportation and Collection of Underwater Bubbles
Authors: Zheng, Z.
Yang, H.
Cao, Y.
Dai, Z.
Issue Date: 2020
Publisher: American Chemical Society
Citation: Zheng, Z., Yang, H., Cao, Y., Dai, Z. (2020). Laser-Induced Wettability Gradient Surface of the Aluminum Matrix Used for Directional Transportation and Collection of Underwater Bubbles. ACS Omega 5 (1) : 718-725. ScholarBank@NUS Repository. https://doi.org/10.1021/acsomega.9b03349
Rights: Attribution 4.0 International
Abstract: The control of underwater bubble behavior on a solid surface has great research significance. However, the control of the spontaneous directional transport and collection of numerous underwater bubbles remains a challenge. A new technique of a metal mesh with superhydrophobic/hydrophobic properties is demonstrated here, which creates a wettability gradient coupled with a microporous array by means of pulsed fiber laser ablation and chemical modification of the aluminum sheet. The resultant wettability surface effectively achieved the spontaneous movement of bubbles along the directional wettability gradient (superaerophobicity to aerophilicity) and through the metal mesh (aerophilicity to superaerophilicity) in the direction of decreasing free energy. Theoretical analysis accounted first for the spontaneous sliding of bubbles on the wettability gradient surface as a result of the action of an unbalanced surface tension force and second for the spontaneous transition of bubbles from the aerophilic to superaerophilic side as a result of the combined action of Laplace pressure and buoyancy. A device with the capability of directional transportation and collection of underwater bubbles was designed based on the samples with a wettability gradient and a superhydrophobic/hydrophobic microporous array as the core components. The potential application is laser ablation of wettability gradient surfaces and metal mesh with superhydrophobic/hydrophobic properties for directional transportation and collection of underwater bubbles. © 2019 American Chemical Society.
Source Title: ACS Omega
URI: https://scholarbank.nus.edu.sg/handle/10635/202605
ISSN: 2470-1343
DOI: 10.1021/acsomega.9b03349
Rights: Attribution 4.0 International
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