Thermal stability of superhydrophobic, nanostructured surfaces

Cha, Sung-Chul; Her, Eun Kyu; Ko, Tae-Jun; Kim, Seong Jin; Roh, Hyunchul; Lee, Kwang-Ryeol; Oh, Kyu Hwan; Moon, Myoung‐Woon

doi:10.1016/j.jcis.2012.09.052

Cited by 45 publications

(25 citation statements)

References 23 publications

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“…This phenomenon is presumably because of hydrogen desorption from the hydrocarbon coating, which results in signifi cant degradation of the hydrophobic properties [ 59 ]. The thermal stability of a surface consisting of a SiO x -DLC fi lm and nanopillars of Si, which has been described above, has been shown to maintain its superhydrophobicity even when the substrate was annealed at temperatures as high as 350 °C [ 48 ]. The surface, however, became superhydrophilic when the annealing temperature was further increased to 450 °C because of thermal degradation of the SiO x -DLC fi lm.…”

Section: Summary and Perspectivementioning

confidence: 98%

“…When the fi lm was deposited on the carbon fi ber network with nanoscale hairlike patterns induced by oxygen plasma treatment, the static contact angle increased to 160° and the contact angle hysteresis was less than 5°, demonstrating further enhanced superhydrophobicity. Cha et al prepared a superhydrophobic surface by combining nanopillars grown on a Si wafer and a hydrophobic SiO x -DLC fi lm and investigated the thermal stability [ 48 ]. The surface containing nanopillars with an aspect ratio (ratio of the height to the diameter of a nanopillar) greater than 5.2 showed a stable superhydrophobic nature with a static contact angle of 155° at temperatures up to 350 °C.…”

Section: Development Of Hydrophobic Surfaces Using Dlcbased Materialsmentioning

confidence: 99%

“…Cha et al reported that a surface consisting of nanopillars of Si (aspect ratio >5.2) combined with a hydrophobic SiO x -DLC fi lm showed superhydrophilicity when it was annealed above 450 °C (Fig. 11.3 ) [ 48 ]. Additionally, they mentioned that such Si nanopillars coated with SiO x -DLC fi lm exhibited superhydrophilicity regardless of the aspect ratio of the nanopillars when annealed above 450 °C.…”

Section: Hydrophilic Surfaces Using Dlc-based Materialsmentioning

confidence: 99%

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Diamond-Like Carbon Coatings with Special Wettability for Automotive Applications

Nagashima

Moon

2015

Coating Technology for Vehicle Applications

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Surface modifi cation is an effective way of improving the tribological properties of base materials and is now actively being used in the automotive industry. Surface wettability can affect the overall performance of automotive components, such as windshields and mirrors, and controlling the surface hydrophobicity or hydrophilicity has been a major focus of research work in this industry. Diamond-like carbon (DLC), which is an amorphous carbon compound with outstanding mechanical and tribological properties, has gained considerable attention as a superior functional coating material and has been successfully applied to a range of mechanical automotive components, leading to better performance and durability. Recently, DLC-based materials with special wettability have been successfully used for the development of superhydrophobic and superhydrophilic surfaces, and a variety of industrial as well as biomedical applications have been proposed. Undoubtedly, being able to control the surface wettability using such DLC-based materials with tunable wettability would expand the original capabilities of the materials used in the automotive industry today. In this chapter, after giving a brief introduction to the fundamentals of surface wettability in relation to DLC coatings, we review recent studies on the control of surface wettability using DLC-based materials and then discuss future outlook.

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Section: Summary and Perspectivementioning

confidence: 98%

Section: Development Of Hydrophobic Surfaces Using Dlcbased Materialsmentioning

confidence: 99%

Section: Hydrophilic Surfaces Using Dlc-based Materialsmentioning

confidence: 99%

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Diamond-Like Carbon Coatings with Special Wettability for Automotive Applications

Nagashima

Moon

2015

Coating Technology for Vehicle Applications

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“…For thermal stimulation, surface wettability showed obvious heat sensitivity [15,16]. Cha et al [15] explored that the nanostructured surface exhibited a clear enhance in surface hydrophilicity when the annealing temperature was greater than 500°C, and all superhydrophobic surfaces became superhydrophilic.…”

Section: Introductionmentioning

confidence: 99%

“…Cha et al [15] explored that the nanostructured surface exhibited a clear enhance in surface hydrophilicity when the annealing temperature was greater than 500°C, and all superhydrophobic surfaces became superhydrophilic. Besides, ultraviolet irradiation aroused switchable surface wettability, from hydrophobic to hydrophilic, on polybenzoxazine/titanium dioxide films, and the hydrophilic film can be switched to hydrophobic again after heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Thermal-induced transformation of wetting behaviors on laser-textured SiC surfaces

Bai

Wang

2016

Sci. China Technol. Sci.

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Thermal-induced transformation of wetting behaviors on laser-textured silicon carbide (SiC) surfaces was discussed in this work. To investigate the transformation, a quenching experiment was conducted and an X-ray diffractometer was used to measure the residual stress. The experimental results demonstrate that the significantly enhanced hydrophilicity was induced by the increasing thermal residual stress of SiC materials after the aqueous quenching. It was found that the decrease in the contact angle increased with the increasing quenching temperature. Quenching at 350°C led to the change of contact angle from 89.28° to 70.88° for the smooth surface, while from 72.25° to 33.75° for the laser-textured surface with depth 8 μm. Further, the surface hydrophobicity was enhanced by the release of thermal residual stress after quenching, thereby leading to an increase in the contact angle over time. The transformation of wetting behaviors on laser textured SiC surfaces can be achieved mutually by the aqueous quenching method. wettability transformation, silicon carbide, laser processing, aqueous aquenching Citation:Bai S X, Wang R. Thermal-induced transformation of wetting behaviors on laser-textured SiC surfaces.

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