Surface Modification of Sol-Gel Silica Antireflective Coatings by F-PMHS: A Simple Method for Improvement of Amphiphobicity

Abstract

Sol-gel silica antireflective coatings (ARCs) with improved amphiphobicity were simply fabricated on BK7 glass substrates via fluorinated-poly(methylhydrogen)siloxane (F-PMHS) surface modification by the dip-coating method. The results of Fourier Transform Infrared (FTIR) and X-ray Photoelectron Spectroscopy (XPS) showed that F-PMHS were covalently bonded to the surface of ARCs. F-PMHS modification significantly improved hydrophobicity and oleophobicity of silica ARCs by increasing their water contact angles from 27 • to 105 • and oil contact angles from 17 • to 45 • . In addition to the improved amphiphobicity, the modified ARCs also possessed excellent transmittance. Most importantly, it was found that with increasing F-PMHS content the atom amounts and porous property of modified ARCs were almost unchanged. This result had been shown to be associated with the changes of optical property and amphiphobicity for silica ARCs, and the details were discussed.

Preparation and Characterization of Some Sol-Gel Modified Silica Coatings Deposited on Polyvinyl Chloride (PVC) Substrates

“…They demonstrated that the antifogging and transparency properties were due to the low water contact angles and the decrease of refractive index, respectively. Lin et al [11] realized sol-gel silica antireflective coatings with amphiphobic property and good transmittance. Gao et al [12] fabricated antireflective superhydrophobic coatings using three silica-based sols: silica sol prepared in acidic medium, silica nanoparticle suspension prepared according to the Stöber method and mesoporous silica nanoparticle suspension, followed by chemical vapor deposition of 1H,1H,2H,2H-perfluorooctyltriethoxysilane.…”

Highly Hydrophobic Cotton Fabrics Modified by Poly(methylhydrogen)siloxane and Fluorinated Olefin: Characterization and Applications

“…With Karstedt catalyst, the addition reaction between -Si-H of PMHS-modified cotton fabric and vinyl groups of 1H,1H,2H-perfluoro-1-decene occurs easily at room temperature, and therefore, the long fluoroalkyl chains can be grafted onto the cotton fabrics by a simple immerging method. As shown in XPS spectra (Figure 2e), there was an addition peak at 689.19 eV attributed to the F element [64]. As shown in Figure 6, as the oil droplet (about 0.05 mL) was dripped onto pristine cotton fabric, the oil spread easily, and quite a big area of cotton fabric was stained by oil.…”

A Review of Additives and their Effects on the Hydrophobicity and Abrasion Resistance of Dip-Coated Silica-Based Anti-Reflective Coatings for Solar Panels

“…In addition, the coating showed an excellent transmittance due to the formation of convex with irregular shapes that increased the porosity. Different from the two studies, Lin et al (2018) [10], used a fluorinated-PMHS (F-PMHS). The optimized result showed a 115° WCA and 99.5% transmittance.…”