Universal wetting transition of an evaporating water droplet on hydrophobic micro- and nano-structures

Adrien Bussonnière; Masoud B. Bigdeli; Di-Yen Chueh; Qingxia Liu; Peilin Chen; Peichun Amy Tsai

doi:10.1039/c6sm02287a

Universal wetting transition of an evaporating water droplet on hydrophobic micro- and nano-structures

Soft Matter ◽

10.1039/c6sm02287a ◽

2017 ◽

Vol 13 (5) ◽

pp. 978-984 ◽

Cited By ~ 21

Author(s):

Adrien Bussonnière ◽

Masoud B. Bigdeli ◽

Di-Yen Chueh ◽

Qingxia Liu ◽

Peilin Chen ◽

...

Keyword(s):

Water Droplet ◽

Wetting Transition ◽

Nano Structures

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Dynamic Wetting Behavior of Vibrated Droplets on a Micropillared Surface

Advances in Materials Science and Engineering ◽

10.1155/2016/8409683 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

Zhi-hai Jia ◽

Wei Lei ◽

Hui-nan Yang ◽

Gang Wang

Keyword(s):

Model Calculation ◽

Water Droplet ◽

Vertical Vibration ◽

Wetting Transition ◽

Compression Process ◽

Dynamic Wetting ◽

Wetting Behavior ◽

Cassie State ◽

Wenzel State

The dynamical wetting behavior has been observed under vertical vibration of a water droplet placed on a micropillared surface. The wetting transition takes place under the different processes. In compression process, the droplet is transited from Cassie state to Wenzel state. The droplet undergoes a Wenzel-Cassie wetting transition in restoring process and the droplet bounces off from the surface in bouncing process. Meanwhile, the wetting and dewetting models during vibration are proposed. The wetting transition is confirmed by the model calculation. This study has potential to be used to control the wetting state.

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Wetting Transition of the Ethanol–Water Droplet on Smooth and Textured Surfaces

The Journal of Physical Chemistry C ◽

10.1021/jp4096437 ◽

2014 ◽

Vol 118 (8) ◽

pp. 4113-4121 ◽

Cited By ~ 24

Author(s):

Atanu K. Metya ◽

Sandip Khan ◽

Jayant K. Singh

Keyword(s):

Water Droplet ◽

Wetting Transition ◽

Textured Surfaces

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Fabrication of Superhydrophobic Microstructures With Nanostructured Sidewalls Designed to Maximize Giant Liquid Slip

ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2 ◽

10.1115/mnhmt2009-18535 ◽

2009 ◽

Author(s):

Choongyeop Lee ◽

Chang-Jin “C. J. ” Kim

Keyword(s):

Slip Length ◽

Hierarchical Structures ◽

Wetting Transition ◽

Gold Coating ◽

Smooth Structures ◽

Nano Structures ◽

Single Scale ◽

Enhanced Stability ◽

Microfabrication Techniques

Superhydrophobic hierarchical structures can not only enhance stability against wetting transition but, if well designed, also produce a larger slip compared to single-scale microstructures. Selective, rather than unilateral, roughening of the microstructure surfaces is desirable to realize increased slip and to study the role of nanoscale roughening; our superhydrophobic hierarchical structures are microscale posts and grates whose top surfaces are kept smooth while sidewall surfaces are etched into nanostructures. To obtain such two-scale micro-nano structures, we have combined two recent microfabrication techniques — gold coating by galvanic displacement and gold-assisted porous etching of silicon. As a result, we have obtained a slip length as large as ∼400 μm on micro-nano structures, which is a ∼100% increase from the previous record of ∼200 μm obtained on micro-smooth structures. Preservation of the microscale geometric parameters was what differentiated our hierarchical samples from others, which showed enhanced stability but would not result in an increased slip. The paper presents the process details developed to fabricate the micro-nano hierarchical structures.

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