Characteristics of organic–inorganic hybrid coating films synthesized from colloidal silica-silane sol

Abstract

Colloidal silica/silane sol solutions were prepared in variation with the amount of silane and reaction time. Such sol solutions were synthesized from colloidal silica/tetramethoxysilane(TMOS)/methyltrimethoxysilane (MTMS). Sol solutions were prepared by sol-gel method through two step reactions. In order to understand their physical and chemical properties, dip coating of sol solutions was performed on the glass substrates. The effects of amount of MTMS and reaction time on the formation of coating films were studied. Coating films became transparent as the reaction time increased. Contact angle of coating films increased with increasing the amount of MTMS. Contact angle of coating films decreased with increasing reaction time. Surface free energy of coating films decreased with increasing the amount of MTMS. Surface roughness of coating films decreased with increasing the amount of MTMS when the reaction time was 6 h. When the reaction time was 24, 48 and 72 h, surface roughness of coating films decreased with increasing the amount of MTMS in the beginning, and then increased when further amount of MTMS was added. Plastic hardness increased with increasing the amount of MTMS. Elastic portion inversely decreased with increasing the amount of MTMS. Coating films were stable until 550°C. Thermal degradation temperature of coating films decreased with increasing the amount of MTMS.

Transparent, non-fluorinated, hydrophobic silica coatings with improved mechanical properties

“…The above mechanism is similar to that reported by Park et al [12], who studied the characteristics of organicinorganic hybrid coating films synthesized from colloidal silica-silane sol. In the present investigation, a surface modified silica nanoparticle suspension was added to the sol synthesized from DMDEOS and TEOS instead of colloidal silica as reported in [12].…”

“…In the present investigation, a surface modified silica nanoparticle suspension was added to the sol synthesized from DMDEOS and TEOS instead of colloidal silica as reported in [12].…”

Bioactive magnesium phosphate/glass composite coatings for magnesium alloy using sol-gel method

“…The TGA curves of MP0, MP10, and MP30 coatings are shown in Figure 1. It can be seen from the gure that there were two stages of thermal decomposition for all samples; the rst stage was under 220 ºC which was assigned to water evaporation and condensation of silanol groups [35]. The second stage ranged from 220 ºC to 580 ºC which was attributed to the combustion of organic components and nitrates.…”

Improving the Corrosion Resistance of Magnesium Alloy by Magnesium Phosphate/Glass Composite Coatings Using Sol–Gel Method

“…1. It can be seen from the figure that there were two stages of thermal decomposition for all samples; the first stage was under 220 ºC which was assigned to water evaporation and condensation of silanol groups [38]. The second stage ranged from 220 ºC to 580 ºC which was attributed to the combustion of organic components and nitrates.…”