High stability superhydrophobic glass-ceramic surface with micro–nano hierarchical structure

Zhong, Wensheng; Wu, Manyuan; Xiong, Bichen; Liu, Qiaowen; Liao, Hongwei

doi:10.1016/j.ceramint.2022.04.350

Cited by 9 publications

(1 citation statement)

References 39 publications

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“…Mullite fiber usually requires temperatures above 1200 • C to be prepared [35], but the molten salt method can prepare mullite fibers at lower temperatures and growth on the ceramic surface [36]. According to Yang et al [37], the decomposition of Al 2 O 3 from Al 2 (SO 4 ) 3 and SiO 2 in molten salt reaches an atomic level of mixing, and then, a chemical reaction occurs to produce mullite. In the process of mullite generation, the free energy of reaction ( 2) is less than 0, which means that mullite can be formed spontaneously if the decomposition of Al 2 (SO 4 ) 3 occurs in Al 2 O 3 .…”

Section: Characterization Of Mullite Layermentioning

confidence: 99%

Robust Superhydrophobic Coating with Mullite Fiber Framework

Zhong

et al. 2022

Coatings

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Superhydrophobic surfaces have received increasing attention due to their excellent water repellency, but the fragile stability of superhydrophobic coatings has been a huge hindrance to their applications. In this work, we constructed a layer of mullite fibers on the surface of a ceramic substrate using high-temperature molten salt. Then, we obtained a superhydrophobic surface with a contact angle greater than 150° via soaking the sample with an alcoholic sol containing modified particles. On the one hand, this interlaced three-dimensional fiber structure increases the surface area and roughness, providing more locations for attaching superhydrophobic particles, as well as improving the water repellency. On the other hand, this fiber layer has a height difference, which protects the superhydrophobic particles attached at lower positions, and when an external object contacts the surface, it gives priority to the stable mullite fibers, reducing the direct contact between superhydrophobic particles and external objects and improving the stability of the superhydrophobic coating. After abrasion with sandpaper, the sample with the mullite fiber layer showed excellent stability compared to the samples without the fiber layer, indicating the significant protective effect of the fiber layer. This paper provides a potential method to enhance the stability of superhydrophobic ceramic surfaces.

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Section: Characterization Of Mullite Layermentioning

confidence: 99%