SiO 2 /silicone hybrid superhydrophobic coating on gypsum-based materials with self-cleaning and moisture resistance
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ORIGINAL PAPER: FUNCTIONAL COATINGS, THIN FILMS AND MEMBRANES ( I N CL U D I N G D E P O S I T I O N T E C H N I Q U E S )
SiO2/silicone hybrid superhydrophobic coating on gypsum-based materials with self-cleaning and moisture resistance Qi Jiang1 Jian Huang1 Baoguo Ma1 Zhengcai Yang1 Ting Zhang1 ●
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Received: 28 March 2020 / Accepted: 15 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Gypsum materials are suffering a shortened service life on account of its poor resistance to moisture and dirt. To overcome such drawbacks, the SiO2/silicone hybrid superhydrophobic surface was introduced on the gypsum surface by the crosslinking of siloxane via sol–gel method. In this study, chemical property and microtopography of the coated surface were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and atomic force microscope (AFM), respectively. Wettability and moisture absorption/desorption tests were carried out to evaluate the superhydrophobicity and moisture resistance of the samples. The results showed that the treated gypsum board had a lower moisture absorption/desorption ratio, compared with the untreated gypsum board (PG). Besides, the coating agent prepared with ethanol and hydrophilic nanosilica particles provided good superhydrophobicity and an optimum moisture-resistance property to the gypsum board. The prepared superhydrophobic surface can endow the material with a self-cleaning effect, protecting it from dust and liquid contamination. The effect mechanism of the solvent and silica particle property on the moisture resistance was discussed in detail. Herein, a green approach is proposed to produce a cleaner gypsum product with extended service life. Graphical Abstract
Keywords SiO2/silicone hybrid superhydrophobic surface Gypsum-based material Moisture absorption Moisture desorption Self-cleaning ●
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* Jian Huang [email protected] 1
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
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Journal of Sol-Gel Science and Technology
Highlights ● SiO2/silicone hybrid superhydrophobic gypsum board was obtained via sol–gel method. ● Superhydrophobicity endowed gypsum board with moisture resistance and self-cleaning effect. ● The sample with ethanol and hydrophilic silica had the lowest moisture absorption ratio.
1 Introduction The self-cleaning effect of plants represented by lotus leaves has aroused great interest in scientific research and industry. It is believed that the self-cleaning effect is caused by the presence of roughened nanostructured papillae as well as a hydrophobic waxy layer on the surface of the lotus leaf [1, 2]. Inspired by these bio-superhydrophobic cases in nature, the superhydrophobic surface can be mimicked by a suitable roughness and the modification of low surface energy [3, 4]. Generally, a surface having a water contact angle (WCA) > 150° and a sliding angle (SA) of
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