Sliding of Water Droplets on Hydrophobic Surfaces with Various Hydrophilic Region Sizes

Langmuir ◽  
2011 ◽  
Vol 27 (11) ◽  
pp. 7307-7313 ◽  
Author(s):  
Tsutomu Furuta ◽  
Munetoshi Sakai ◽  
Toshihiro Isobe ◽  
Sachiko Matsushita ◽  
Akira Nakajima
Keyword(s):  
Water Droplets ◽  
Hydrophobic Surfaces ◽  
Hydrophilic Region

Wetting of Structured Hydrophobic Surfaces by Water Droplets

Langmuir ◽  
2005 ◽  
Vol 21 (26) ◽  
pp. 12235-12243 ◽  
Author(s):  
Oskar Werner ◽  
Lars Wågberg ◽  
Tom Lindström
Keyword(s):  
Water Droplets ◽  
Hydrophobic Surfaces

Wetting Mode Transition of Water Droplets by Electrowetting on Highly Hydrophobic Surfaces Coated with Two Different Silanes

2012 ◽  
Vol 41 (1) ◽  
pp. 23-25 ◽  
Author(s):  
Tsutomu Furuta ◽  
Munetoshi Sakai ◽  
Toshihiro Isobe ◽  
Sachiko Matsushita ◽  
Akira Nakajima
Keyword(s):  
Mode Transition ◽  
Water Droplets ◽  
Hydrophobic Surfaces ◽  
Highly Hydrophobic

Micro/Meso Scale Modelling of Two-Phase Flow on Functional Surfaces: A Numerical Simulation of Water Droplets on Natural Hydrophobic Surfaces With Micro Roughness

2009 ◽  
Author(s):  
Y. Y. Yan
Keyword(s):  
Two Phase Flow ◽  
Contact Angles ◽  
Phase Flow ◽  
Fluid Interface ◽  
Water Droplets ◽  
Hydrophobic Surfaces ◽  
Two Phase ◽  
Partial Wetting ◽  
Scale Modelling ◽  
Meso Scale

A micro/meso scale modelling of two-phase droplets move on hydrophilic/hydrophobic surfaces with micro roughness is reported. The physical model is basically of two-phase flow interacting with the surfaces of different hydrophobicity or wettability. Numerical modelling based on the lattice Boltzmann method (LBM) is developed and applied to the computational calculation and simulation. The LBM modelling deals with surface tension dominated behaviour of water droplets in air spreading on a hydrophilic surface with hydrophobic strips of different sizes and contact angles under different physical and interfacial conditions, and aims to find quantitative data and physical conditions of the biomimetic approaches. The current LBM can be applied to simulate two-phase fluids with large density ratio (up to 1000), and meanwhile deal with interactions between a fluid-fluid interface and a partial wetting wall. In the simulation, the interactions between the fluid-fluid interface and the partial wetting wall with different hydrophobic strips such as single strip, intersecting stripes, and alternating & parallel stripes, of different sizes and contact angles are considered and tested numerically; the phenomena of droplets spreading and breaking up, and the effect of hydrophobic strips on the surface wettability or self-cleaning characteristics are simulated, reported and discussed.

Dust mitigation by rolling water droplets from hydrophobic surfaces

2021 ◽  
Vol 22 ◽  
pp. 100825
Author(s):  
Bekir Sami Yilbas ◽  
Ghassan Hassan ◽  
Hussain Al-Qahtani ◽  
Abdullah Al-Sharafi ◽  
A.Z. Sahin
Keyword(s):  
Water Droplets ◽  
Hydrophobic Surfaces

Sliding behavior of water droplets on line-patterned hydrophobic surfaces

2008 ◽  
Vol 254 (6) ◽  
pp. 1797-1805 ◽  
Author(s):  
Shunsuke Suzuki ◽  
Akira Nakajima ◽  
Kouichi Tanaka ◽  
Munetoshi Sakai ◽  
Ayako Hashimoto ◽  
...  
Keyword(s):  
Water Droplets ◽  
Hydrophobic Surfaces ◽  
On Line

Relationship between sliding acceleration of water droplets and dynamic contact angles on hydrophobic surfaces

2006 ◽  
Vol 600 (16) ◽  
pp. L204-L208 ◽  
Author(s):  
Munetoshi Sakai ◽  
Jeong-Hwan Song ◽  
Naoya Yoshida ◽  
Shunsuke Suzuki ◽  
Yoshikazu Kameshima ◽  
...  
Keyword(s):  
Dynamic Contact ◽  
Contact Angles ◽  
Water Droplets ◽  
Hydrophobic Surfaces

Retention of Water Droplets by Hydrophobic Surfaces

1993 ◽  
Vol 140 (9) ◽  
pp. L140-L142 ◽  
Author(s):  
Hiroaki Tada ◽  
Hirotsugu Nagayama
Keyword(s):  
Water Droplets ◽  
Hydrophobic Surfaces

scholarly journals Stretchable Hydrophobic Surfaces and Self-Cleaning Applications

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bekir Sami Yilbas ◽  
Ghassan Hassan ◽  
Hussain Al-Qahtani ◽  
Naser Al-Aqeeli ◽  
Abdullah Al-Sharafi ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Droplet ◽  
Dust Removal ◽  
Dust Particles ◽  
Mass Ratio ◽  
Water Droplets ◽  
Surface Wetting ◽  
Hydrophobic Surfaces ◽  
Removal Mechanisms ◽  
Nano Size

Abstract Hydrophobizing of stretchable elastomer surfaces is considered and the reversible behavior of the resulting surface wetting state is examined after stretching and relaxing the hydrophobized samples. The environmental dust are analyzed in terms of elemental constitutes and size, and the dust pinning on the hydrophobized surface is measured. The dust removal mechanisms, by the water droplets on the hydrophobized surface, are investigated. We demonstrated that deposition of functionalized nano-size silica units on the elastomer surface gives rise to hydrophobicity with 135° ± 3° contact angle and low hysteresis of 3° ± 1°. Stretching hydrophobized elastomer surface by 50% (length) reduces the contact angle to 122° ± 3° and enhances the hysteresis to 6° ± 1°. However, relaxing the stretched sample causes exchanging surface wetting state reversibly. Water droplet rolling and sliding can clean the dusty hydrophobized surface almost 95% (mass ratio of the dust particles removed). Droplet puddling causes striations like structures along the droplet path and close examination of the few residues of the dust reveals that the droplet takes away considerably large amount of dust from surface.

Anti-Icing Property of the Prepared Super-Hydrophobic Octadecyltrichlorosilane (OTS) Film by Phase Separation Method

2013 ◽  
Vol 663 ◽  
pp. 331-334
Author(s):  
Liang Ge ◽  
Jin Yuan Yao ◽  
Hong Wang ◽  
Gui Fu Ding
Keyword(s):  
Contact Angle ◽  
Phase Separation ◽  
Heterogeneous Nucleation ◽  
Hydrophobic Surface ◽  
Separation Method ◽  
Surface Wettability ◽  
Nucleation Theory ◽  
Ice Formation ◽  
Water Droplets ◽  
Hydrophobic Surfaces

In this paper, we prepared an octadecyltrichlorosilane(OTS) super-hydrophobic film using phase separation method to demonstrate the anti-icing property of super-hydrophobic surfaces. We investigated the super-hydrophobicity of the surface in -5°C environment, as well as the icing process of water droplets on the surface which proceeded at the temperature low to -15°C. We found that the prepared OTS film retained its super-hydrophobicity in the -5°C environment by the measurement of contact angle. It was observed that the icing progress of water droplets on the super-hydrophobic surface was greatly retarded. Based on the classical heterogeneous nucleation theory, it concluded that the ice formation is directly related to the surface wettability. This research would be beneficial to the preparation of anti-icing films.

Control of Water Droplets on Super-Hydrophobic Surfaces by Static Electric Field

2002 ◽  
Vol 41 (Part 1, No. 1) ◽  
pp. 287-291 ◽  
Author(s):  
Koji Takeda ◽  
Akira Nakajima ◽  
Yuji Murata ◽  
Kazuhito Hashimoto ◽  
Toshiya Watanabe
Keyword(s):  
Electric Field ◽  
Water Droplets ◽  
Static Electric Field ◽  
Hydrophobic Surfaces
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