PREPARATION OF GEOTHERMAL SILICA GLASS COATING FILM THROUGH MULTI-FACTOR OPTIMIZATION
S. Silviana, Gelbert Jethro Sanyoto, Adi Darmawan
Abstract
Glass coating films have been developed by many researchers in recent years. However, mass commercialization of this technology is still inefficient, and optimal methods are needed to produce affordable products. This paper introduces a film preparation method through, which a coating film is superimposed on silica glass by utilizing geothermal waste, a byproduct of geothermal power plants. Geothermal waste has been used as a 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 that consists of statistically significant variables can be generalized to a broad 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.