Competing Effects between Condensation and Self-Removal of Water Droplets Determine Antifrosting Performance of Superhydrophobic Surfaces

2020 ◽  
Vol 12 (6) ◽  
pp. 7805-7814 ◽  
Author(s):  
Guanlei Zhao ◽  
Guisheng Zou ◽  
Wengan Wang ◽  
Ruikun Geng ◽  
Xiao Yan ◽  
...  
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Droplets

scholarly journals One-step fabrication of soft calcium superhydrophobic surfaces by a simple electrodeposition process

RSC Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 297-308
Author(s):  
Zhi Chen ◽  
Yongbo Hu ◽  
Xu He ◽  
Yihao Xu ◽  
Xuesong Liu ◽  
...  
Keyword(s):  
Formation Process ◽  
Superhydrophobic Surface ◽  
Surface Preparation ◽  
Superhydrophobic Surfaces ◽  
Water Droplets ◽  
Step Method ◽  
Electrodeposition Process ◽  
Pressing Force ◽  
One Step

We investigated a one-step method for calcium superhydrophobic surface preparation and researched the formation process of loose, flower-like microstructures. Also, we found that the pressing force strongly impacts the dynamics of water droplets.

scholarly journals Water droplet friction and rolling dynamics on superhydrophobic surfaces

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Matilda Backholm ◽  
Daniel Molpeceres ◽  
Maja Vuckovac ◽  
Heikki Nurmi ◽  
Matti J. Hokkanen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Friction Force ◽  
Water Droplet ◽  
Superhydrophobic Surfaces ◽  
Silicon Surfaces ◽  
Force Sensors ◽  
Water Droplets ◽  
Indirect Contact ◽  
Gold Standard Method ◽  
Superhydrophobic Coatings

Abstract Superhydrophobicity is a remarkable surface property found in nature and mimicked in many engineering applications, including anti-wetting, anti-fogging, and anti-fouling coatings. As synthetic superhydrophobic coatings approach the extreme non-wetting limit, quantification of their slipperiness becomes increasingly challenging: although contact angle goniometry remains widely used as the gold standard method, it has proven insufficient. Here, micropipette force sensors are used to directly measure the friction force of water droplets moving on super-slippery superhydrophobic surfaces that cannot be quantified with contact angle goniometry. Superhydrophobic etched silicon surfaces with tunable slipperiness are investigated as model samples. Micropipette force sensors render up to three orders of magnitude better force sensitivity than using the indirect contact angle goniometry approach. We directly measure a friction force as low as 7 ± 4 nN for a millimetric water droplet moving on the most slippery surface. Finally, we combine micropipette force sensors with particle image velocimetry and reveal purely rolling water droplets on superhydrophobic surfaces.

HOT WATER-REPELLENT SUPERHYDROPHOBIC SURFACES WITH LONG-TERM STABILITY

2021 ◽  
Author(s):  
JI SEONG CHOI ◽  
SEONG MIN KANG
Keyword(s):  
Hot Water ◽  
Superhydrophobic Surfaces ◽  
Water Repellent ◽  
Water Droplets ◽  
Long Term Stability ◽  
Cassie State ◽  
Potential Applications ◽  
Different Temperatures ◽  
Temperature Water

In this paper, we fabricate and evaluate superhydrophobic surfaces with mushroom-shaped microstructures. Using a silicon master and polymer microstructure patterning, polydimethylsiloxane (PDMS) surfaces bearing mushroom-shaped structures with five different spacing ratios are prepared and tested with water droplets of different temperatures. The fabricated PDMS surfaces demonstrate superhydrophobicity even to high-temperature water droplets with decreased surface tension. We compare the experimental data with the theoretical results calculated based on the Cassie state and Eötvös rule. Our work suggests potential applications to control wettability with liquids of various temperatures.

Evaporation Kinetics of Sessile Water Droplets on Micropillared Superhydrophobic Surfaces

Langmuir ◽  
2013 ◽  
Vol 29 (20) ◽  
pp. 6032-6041 ◽  
Author(s):  
Wei Xu ◽  
Rajesh Leeladhar ◽  
Yong Tae Kang ◽  
Chang-Hwan Choi
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Droplets ◽  
Kinetics Of ◽  
Evaporation Kinetics

Using Pencil Drawing To Pattern Robust Superhydrophobic Surfaces To Control the Mobility of Water Droplets

2011 ◽  
Vol 115 (33) ◽  
pp. 16495-16500 ◽  
Author(s):  
Chih-Feng Wang ◽  
Tsai-Fu Wang ◽  
Chih-Siang Liao ◽  
Shiao-Wei Kuo ◽  
Han-Ching Lin
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Droplets ◽  
Pencil Drawing

scholarly journals Sliding of water droplets on micropillar-structured superhydrophobic surfaces

2020 ◽  
Vol 504 ◽  
pp. 144493 ◽  
Author(s):  
Chun-Wei Yao ◽  
Sirui Tang ◽  
Divine Sebastian ◽  
Rafael Tadmor
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Droplets

scholarly journals Evaporation of squeezed water droplets between two parallel hydrophobic/superhydrophobic surfaces

2020 ◽  
Vol 576 ◽  
pp. 127-138 ◽  
Author(s):  
Xukun He ◽  
Jiangtao Cheng ◽  
C. Patrick Collier ◽  
Bernadeta R. Srijanto ◽  
Dayrl P. Briggs
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Droplets
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