Synthesis and Characterization of Hydrophobic Silica Thin Layer Derived from Methyltrimethoxysilane (MTMS)

International Conference on Chemistry and Material Science 2017

化学;材料科学

Darmawan, Adi^1 ; Utari, Riyadini^1 ; Saputra, Riza Eka^1 ; Suhartana^1 ; Astuti, Yayuk^1

Department of Chemistry, Diponegoro University, Semarang

50275, Indonesia^1

关键词: Dipcoating methods;    Hydrophobic nature;    Hydrophobic properties;    Methyltrimethoxysilane;    Pore morphology;    Synthesis and characterizations;    Thin layers;    Water contact angle measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/299/1/012041/pdf
DOI  :  10.1088/1757-899X/299/1/012041

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This study investigated the synthesis and characterization of MTMS hydrophobic silica prepared by sol-gel method. In principle, silica xerogels and silica thin layer were obtained by reacting MTMS in ethanol solvent in some pH variations. The MTMS solution was used to modify the surface of the ceramic plate by dipcoating method to further be calcined at two different temperatures of 350°C and 500°C. The silica xerogels were analysed by FTIR, TGA-DSC and GSA to determine functional group characteristics, thermal properties and pore morphology respectively. Meanwhile, the silica thin layers were analysed their hydrophobic properties using water contact angle measurement and surface roughness determination using SEM. The results showed that the higher the pH used in the MTMS solution, the higher the resulting contact angle. The highest contact angle was obtained at pH 8.12 which reached 94.7° and 79.5° for silica thin layer calcined at 350°C and 500°C, respectively. The TGA results indicated that the methyl group survived up to 400°C and disappeared at 500°C which had implications on silica thin layer hydrophobic nature. GSA result exhibited that the silica xerogel had a close structure with a very low pore volume. While the SEM-EDX results displayed that the silica thin layer prepared at acidic pH had smoother surface morphology and became rough when prepared at an alkaline pH.