Effect of Modified SiO₂ on the Hydrophobic Properties as Self-Cleaning Materials

Abstract

In this work, hydrophobic of modified SiO2 coating for self cleaning material were prepared by dip-coating methods and solvothermal manual. SiO2 was successfully prepared from silica sand by purified followed sol-gel methods. Tetraetoxysilane (TEOS) and Hexamethyldisilanze (HMDS) were used as surface chemical modification agents with varied mass of SiO2, which were 1, 2, 3, and 4 g. X-ray fluorescence spectrometer (XRF) , X-ray powder diffraction (XRD), Particle size analyzer (PSA), Ultraviolet–visible spectrophotometer (UV-Vis), and Water contact angle (WCA) were employed to investigate the element composition, crystal structure, size of particles, transparency, and hydrophobicity of coating. The results indicated that modified SiO2 coatings has hydrophobic feature as self cleaning material (WCA > 90˚) for indium tin oxide (ITO) glass.

Synthesis of Silica from Rice Husk Waste for Hydrophobic Material as an Anti-Water Coating for Eyeglasses

“…The contact angle values on the glass samples coated with PDMS/SiO 2 are shown in Table II. Other research has reported that the addition of SiO 2 content to modified SiO 2 material for indium tin oxide (ITO) resulted in changes in the formed contact angle due to surface roughness and low free energy [6]. Therefore, it is evident that the use of PDMS and SiO 2 plays a role in the hydrophobicity of the material in this research.…”

“…It is believed that the homogenous particle size of SiO 2 (5 µm) due to the addition of the CTAB compound as an additive to homogenize the particle distribution influenced the formed contact angle. Other research has reported suboptimal contact angle results due to non-homogeneous coating processes and particle sizes (without the addition of a surfac-tant) [6]. The glass substrate used in this research is polar and has a smooth surface, so when the glass surface interacts with water (which is polar), it results in a hydrophilic interaction.…”

“…According to previous research reported range of containing SiO 2 from RHA is between 72.1 to 98.61 wt.%, so this result is good enough because the raw material RHA has not been treated to purify [7]. In addition, Linda et al reported that used sand silica obtained containing element Si of 81.7 wt.%, where the result is nearly comparable [6].…”

“…The transmitted light is also relatively high at 99.30% [5]. Moreover, as a research comparison, hydrophobic coating materials have been carried out using silica from silica sand resulting in a contact angle of 98 • [6]. Also according to Priyadi and Wahyuni's research, PDMS or polydimethylsiloxane is a polymer that has hydrophobic properties due to its low surface energy and is commonly used as a coating for a material to increase the hydrophobicity.…”

PTFE/EP Reinforced MOF/SiO2 Composite as a Superior Mechanically Robust Superhydrophobic Agent towards Corrosion Protection, Self‐Cleaning and Anti‐Icing

“…Therefore, it can resist more against corrosive solution. The addition of SiO 2 particles improve coating resistance and quality with micro/nano structure [59–61] . As common anticorrosive coating, PTFE/PTFE/EP primary layer has a good shielding effect and exceptional barrier against corrosive media.…”