Transactions of Nanjing University of Aeronautics & Astronautics
Wettability Pattern for Ultrafast Water Self-Pumping on Cemented Carbide Surface
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Abstract:
A facile method to fabricate wettability pattern (two extreme wettabilities arranged in a pattern) to realize water self-pumping is proposed on cemented carbide while not necessarily depositing other materials on substrate surface. The water self-pumping is achieved by arranging wedge shaped superhydrophilic domain in superhydrophobic substrate using laser machining. Through single factor experiments, it is found that the key to the extreme wettabilities, micro- and nano-structures, is rendered by laser machining processes and is influenced by laser parameters. Meanwhile, the proper laser parameters that are used to fabricate required micro- and nano-structures are obtained. Finally, the water transport experiment is carried out, which shows that the velocity of water bulge could be up to 362 mm/s when the wedge angle is 3°. The mechanism of the water self-pumping is analyzed and it is found that the migration of water bulge is governed by Laplace pressure of the water bulge induced by the wedge micro-groove.
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Clc Number:
TN925
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