Effect of upper contact line on sliding behavior of water droplet on superhydrophobic surface |
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Authors: | ChangWei Yang PengFei Hao Feng He |
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Institution: | (1) School of Aerospace, Tsinghua Universtiy, Beijing, 100084, China |
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Abstract: | With a low surface energy, high apparent contact angle(>150°) and low sliding angle(<5°), superhydrophobic surface has recently
been attracting a great deal of attention. The true factor determining the sliding angle still remains unclear. In this paper,
various superhydrophobic silicon surfaces with pillars are fabricated by photolithography and hydrophobized with octadecyltrichlorosilane
(OTS). Relations between sliding angles and micro-structured surfaces are being investigated in detail with 10 mg water droplets
in C-B state and mixed state. Experimental pictures and data show that the sliding angle is independent of pillar heights
from 20 to 80 μm, increasing the space between pillars causes decrease in sliding angle, and increasing the side lengths of
pillars causes increase in sliding angle. Moreover, the sliding angle is irrelevant to the state of interfacial contact area
of water-solid and lower contact line. It is concluded that the sliding angle of water droplet on the micro-structured surface
is merely determined by the upper contact line.
Supported by the National Natural Science Foundation of China (Grant Nos. 10672089 and 10872106) |
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Keywords: | three-phase contact line upper contact line super-hydrophobic surface sliding angle mixed mode |
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