Journal
RSC ADVANCES
Volume 7, Issue 43, Pages 26834-26838Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra00622e
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Funding
- China National Petroleum & gas Corporation science and technology development project Nano intelligent chemical flooding agent [2014A-1001]
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Silica coatings with high-transmittance and good environment-resistance properties were prepared by an acid-catalyzed sol-gel method without template. Hexamethyldisilazane (HMDS) was added into an acid-catalyzed silica sol which acted not only as the catalyst but also as a blocking agent. The effect of different contents of HMDS has been investigated. The sponge-like silica coating was obtained when the weight ratio of HMDS to SiO2 was higher than 90%. The addition of HMDS enabled these silica antireflective coatings to possess excellent hydrophobicity properties. When the weight ratio of HMDS to SiO2 was 100%, the silica coating exhibited transmittance as high as 99.64% at a given wavelength and static water contact angle of 143.0 degrees.After 48 hours of environment aging testing at 40%, 60% and 80% RH, these coatings showed a minute decrease upon maximum transmittance, from 99.64% to 99.56%, 99.49% and 99.38%, respectively. The sponge-like HMDS-containing coatings exhibited easy-to-clean properties, which would have great potential application in laser systems.
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