Hydrophobicity and freezing of a water droplet on fluoroalkylsilane coatings with different roughnesses

Shunsuke Suzuki; Akira Nakajima; Naoya Yoshida; Munetoshi Sakai; Ayako Hashimoto; Yoshikazu Kameshima; Kiyoshi Okada

doi:10.1021/la701077p

Hydrophobicity and freezing of a water droplet on fluoroalkylsilane coatings with different roughnesses

Shunsuke Suzuki, Akira Nakajima, Naoya Yoshida, Munetoshi Sakai, Ayako Hashimoto, Yoshikazu Kameshima, Kiyoshi Okada

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

Smooth (Ra ≈ 0.1 nm) and rough (Ra ≈ 20 nm) coatings of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107° and 110°, respectively), but their sliding angles differed considerably (10° and 27°, respectively). The surface potential on the smooth coating, assessed using Kelvin force microscopy, showed a sharp distribution, but that on the rough coating ranged widely, implying large chemical heterogeneity including residual SiOH groups. The freezing temperature of a supercooled water droplet on the rough coating was higher than that on the smooth coating.

Original language	English
Pages (from-to)	8674-8677
Number of pages	4
Journal	Langmuir
Volume	23
Issue number	17
DOIs	https://doi.org/10.1021/la701077p
Publication status	Published - Aug 14 2007
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/la701077p

Cite this

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abstract = "Smooth (Ra ≈ 0.1 nm) and rough (Ra ≈ 20 nm) coatings of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107° and 110°, respectively), but their sliding angles differed considerably (10° and 27°, respectively). The surface potential on the smooth coating, assessed using Kelvin force microscopy, showed a sharp distribution, but that on the rough coating ranged widely, implying large chemical heterogeneity including residual SiOH groups. The freezing temperature of a supercooled water droplet on the rough coating was higher than that on the smooth coating.",

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T1 - Hydrophobicity and freezing of a water droplet on fluoroalkylsilane coatings with different roughnesses

AU - Suzuki, Shunsuke

AU - Nakajima, Akira

AU - Yoshida, Naoya

AU - Sakai, Munetoshi

AU - Hashimoto, Ayako

AU - Kameshima, Yoshikazu

AU - Okada, Kiyoshi

PY - 2007/8/14

Y1 - 2007/8/14

N2 - Smooth (Ra ≈ 0.1 nm) and rough (Ra ≈ 20 nm) coatings of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107° and 110°, respectively), but their sliding angles differed considerably (10° and 27°, respectively). The surface potential on the smooth coating, assessed using Kelvin force microscopy, showed a sharp distribution, but that on the rough coating ranged widely, implying large chemical heterogeneity including residual SiOH groups. The freezing temperature of a supercooled water droplet on the rough coating was higher than that on the smooth coating.

AB - Smooth (Ra ≈ 0.1 nm) and rough (Ra ≈ 20 nm) coatings of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107° and 110°, respectively), but their sliding angles differed considerably (10° and 27°, respectively). The surface potential on the smooth coating, assessed using Kelvin force microscopy, showed a sharp distribution, but that on the rough coating ranged widely, implying large chemical heterogeneity including residual SiOH groups. The freezing temperature of a supercooled water droplet on the rough coating was higher than that on the smooth coating.

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Hydrophobicity and freezing of a water droplet on fluoroalkylsilane coatings with different roughnesses

Abstract

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