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- Language
- english
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received October 30, 2021
Accepted December 14, 2021
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Copyright © KIChE. All rights reserved.
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Visualization Study on Microscale Wetting Dynamics of Water Droplets on Dry and Wet Hydrophilic Membranes
1Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 37673, Korea 2Department of Medical Life Sciences, College of Medicine, College of Medicine, The Catholic University of Korea, Seoul, 06591, Korea 3Department of Chemical Engineering, McGill University, 845 Sherbrooke St W, Monctreal, Quebec H3A 0GA, Canada 4School of Mechanical Engineering, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul, 06978, Korea 5Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk, 376735, Korea 6, Korea
jiwoohong@ssu.ac.kr
Korean Chemical Engineering Research, May 2022, 60(2), 277-281(5), 10.9713/kcer.2022.60.2.277 Epub 27 April 2022
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Abstract
The wetting dynamics of water droplets dispensed on the surface of dry and wet hydrophilic membranes were investigated experimentally from a microscale point of view. By using a high-speed, white-beam x-ray microimaging (WXMI) synchrotron, consecutive images displaying the dynamic motions of the droplets were acquired. Through analyzing the characteristics observed, it was found that the dry hydrophilic membrane showed local hydrophobicity at a certain point during the absorption process with apparent contact angles greater than 90. While on the other hand, the apparent contact angles of a water droplet absorbing into the wet membrane remained less than 90 and showed total hydrophilicity. The observations and interpretation of characteristics that affect the contact, wetting, recoiling, and dynamic behaviors of droplets are significant for controlling liquid droplet impingement in a desired manner.
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