The encounter of a nanodrop with a trench on a hysteresis-free surface is explored by many-body dissipative particle dynamics to show the effect of surface roughness on droplet wetting. A free nanodrop exhibits Brownian motion and the diffusivity decays exponentially with the liquid-solid contact area. In contrast, as the nanodrop sits on a trench, its random motion is constrained. Work must be done to overcome the energy barriers for the transition between free and trapped states. The potential energy landscape is thus constructed based on the force-displacement plot. It is shown that the trench acts as a hydrophobic blemish for capture but like a hydrophilic blemish for escape. A drop always breaks up after detachment from a hydrophilic trench. Therefore, the drop tends to bypass a small trench when it meets one. The macroscopic experiments are performed by fabricating liquid-infused surfaces with extremely low contact angle hysteresis. The experimental observations agree qualitatively with simulation outcomes.
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28 October 2016
Research Article|
October 25 2016
Resisting and pinning of a nanodrop by trenches on a hysteresis-free surface
Cheng-Chung Chang;
Cheng-Chung Chang
1Department of Chemical Engineering,
National Taiwan University
, Taipei 106, Taiwan
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Cyuan-Jhang Wu;
Cyuan-Jhang Wu
2Department of Chemical and Materials Engineering,
National Central University
, Jhongli 320, Taiwan
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Yu-Jane Sheng
;
Yu-Jane Sheng
a)
1Department of Chemical Engineering,
National Taiwan University
, Taipei 106, Taiwan
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Heng-Kwong Tsao
Heng-Kwong Tsao
a)
2Department of Chemical and Materials Engineering,
National Central University
, Jhongli 320, Taiwan
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Cheng-Chung Chang
1
Cyuan-Jhang Wu
2
Yu-Jane Sheng
1,a)
Heng-Kwong Tsao
2,a)
1Department of Chemical Engineering,
National Taiwan University
, Taipei 106, Taiwan
2Department of Chemical and Materials Engineering,
National Central University
, Jhongli 320, Taiwan
a)
Electronic addresses: [email protected] and [email protected]
J. Chem. Phys. 145, 164702 (2016)
Article history
Received:
August 02 2016
Accepted:
October 05 2016
Citation
Cheng-Chung Chang, Cyuan-Jhang Wu, Yu-Jane Sheng, Heng-Kwong Tsao; Resisting and pinning of a nanodrop by trenches on a hysteresis-free surface. J. Chem. Phys. 28 October 2016; 145 (16): 164702. https://doi.org/10.1063/1.4965432
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