Statistical Approaching for Superhydrophobic  Coating Preparation using Silica Derived from  Geothermal Solid Waste

S. Silviana; Adi Darmawan; Agus Subagyo; Febio Dalanta

S. Silviana Department of Chemical Engineering, Faculty of Engineering, Diponegoro University, Indonesia
Adi Darmawan Department of Chemistry, Faculty of Science and Mathematics, Diponegoro University, Indonesia
Agus Subagyo Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Indonesia
Febio Dalanta Master Program of Chemical Engineering, Faculty of Engineering, Diponegoro University, Indonesia

Keywords: ANOVA, geothremal silica, superhydrophobic coating, TMCS

Abstract

Material quality can be affected by humidity resulting in short durability. Many observations have been conducted to endure the durability of material, such as coating methods. However, recent methods are unaffordable. Therefore, this paper observes efficient and effective method to prepare superhydrophobic silica coatings derived from geothermal waste. The method was conducted by spraying. The objective of this paper is to observe optimum condition by using variables of silica concentration, TMCS (trimethylsilyl chloride) concentration, solvents and materials confirmed by contact angle of material based on statistical analysis. The study consisted of silica treatment for purification and preparation of superhydrophobic silica coatings. The study was carried out in factorial design of 81 experiments with one-time replication through Design Expert software (version 8.0.6). Based on previous research, the experiment was obtained optimum condition at 5.5 %w/v, 13 %v/v, isooctane, zinc coated for silica concentration, TMCS concentration, solvent and material, respectively, releasing contact angle by instrumentation of 180°. By ANOVA analysis, it was also complied the optimum condition of the superhydrophobic coating solution preparation achieved the same condition with experimental data releasing contact angle of 179.69°.

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