The evaporation dynamics of water from sticky superhydrophobic surfaces was investigated using a quartz crystal microresonator and an optical microscope. Anodic aluminum oxide (AAO) layers with different pore sizes were directly fabricated onto quartz crystal substrates and hydrophobized via chemical modification. The resulting AAO layers exhibited hydrophobic or superhydrophobic characteristics with strong adhesion to water due to the presence of sealed air pockets inside the nanopores. After placing a water droplet on the AAO membranes, variations in the resonance frequency and Q-factor were measured throughout the evaporation process, which were related to changes in mass and viscous damping, respectively. It was found that droplet evaporation from a sticky superhydrophobic surface followed a constant contact radius (CCR) mode in the early stage of evaporation and a combination of CCR and constant contact angle modes without a Cassie–Wenzel transition in the final stage. Furthermore, AAO membranes with larger pore sizes exhibited longer evaporation times, which were attributed to evaporative cooling at the droplet interface.
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10 July 2017
Research Article|
July 11 2017
Water droplet evaporation from sticky superhydrophobic surfaces
Moonchan Lee;
Moonchan Lee
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH)
, San 31, Hyoja-dong, Nam-gu, Pohang, South Korea
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Wuseok Kim;
Wuseok Kim
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH)
, San 31, Hyoja-dong, Nam-gu, Pohang, South Korea
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Sanghee Lee;
Sanghee Lee
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH)
, San 31, Hyoja-dong, Nam-gu, Pohang, South Korea
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Seunghyeon Baek;
Seunghyeon Baek
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH)
, San 31, Hyoja-dong, Nam-gu, Pohang, South Korea
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Kijung Yong;
Kijung Yong
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH)
, San 31, Hyoja-dong, Nam-gu, Pohang, South Korea
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Sangmin Jeon
Sangmin Jeon
a)
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH)
, San 31, Hyoja-dong, Nam-gu, Pohang, South Korea
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a)
Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 111, 021603 (2017)
Article history
Received:
April 16 2017
Accepted:
June 25 2017
Citation
Moonchan Lee, Wuseok Kim, Sanghee Lee, Seunghyeon Baek, Kijung Yong, Sangmin Jeon; Water droplet evaporation from sticky superhydrophobic surfaces. Appl. Phys. Lett. 10 July 2017; 111 (2): 021603. https://doi.org/10.1063/1.4992140
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