Preparation and surface modification of magnesium-based sound absorbing materials via a low-temperature vapor deposition

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2023, 121(0), , pp.40-44
• Main Authors: Zhou, Dongdong, Fang, Li, Du, Zhiping, Cheng, Fangqin, Han, Yunshan, Cheng, Zhi
• Format: Article
• Language: English
• Subjects: Large-scale; Low-temperature vapor deposition; Magnesium-based sound absorbing materials; Superhydrophobic; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2022.05.031

[Display omitted] The poor durability of lightweight cement due to hydrophilic property and porous microstructure limits its extensive application. In this study, a superhydrophobic magnesium-based sound absorbing materials (Mg-SAM) have been prepared using basic magnesium sulfate cement as the matrix material and then modified by a low-temperature vapor deposition (LTVD). The results reveal that an ultrathin film of perfluorodecyltriethoxysilane (PFDTS) can be gently deposited on the surface of Mg-SAM with a water contact angle higher than 150° via a low temperature (65 °C) heating process. The modification mechanism of LTVD can be described as the formation of a self-assembled fluorine-containing film through the condensation reaction between silanols and the hydroxyl groups on the surface of Mg-SAM. The noise reduction coefficient and mechanical strength of Mg-SAM with a density of 280 kg·m−3 reach 0.7 and 1.8 MPa respectively without any change after LTVD treatment. This facile, low-cost LTVD technique is a promising approach for large-scale modification of porous materials.