Preparation of geothermal silica glass coating film through multi-factor optimization

Abstract

Glass coating films have been developed by many researchers in recent years. However, mass commercialization of this technology is still inefficient. An appropriate method is required to generate affordable product. This paper observes a film preparation method using silica glass of geothermal waste silica derived from geothermal power plants. Geothermal waste has been used as silica precursor and modified using several silylation agents such as methyltriethoxysilane (MTMS), hexamethyldisilazane (HMDS), polydimethylsiloxane (PDMS), and surface-active agent (surfactant) cethyltrimethylammoniumbromide (CTAB). Design Expert 8.0.6 is used for optimization to find the desired product at the concentration of specific precursors and silane agents using contact angle responses. A model consisting statistically significant variables can be generalized to abroad data range. The results of this study indicate that the glass surface coated with modified silica produces hydrophobic glass with contact angles up to 90° using the MTMS silylation agent.