Citation: XU Li-Li, LI Xiao-Guang, NI Xing-Yuan, SHEN Jun. Micro-Structure and Surface Modification of Porous Silica Coating and Their Effects on Hydrophobicity[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(3): 449-454. doi: 10.3969/j.issn.1001-4861.2013.00.089 shu

Micro-Structure and Surface Modification of Porous Silica Coating and Their Effects on Hydrophobicity

1.
Shanghai Key Laboratory of Special Microstructure and Technology, Tongji University, Shanghai 200092, China

Received Date: 14 September 2012
Available Online: 13 November 2012
Fund Project: 国家自然科学基金(No.11074189) (No.11074189)上海市科委纳米专项(No.11nm0501600)资助项目。 (No.11nm0501600)

In this work, the micro-structure and surface modification of sol-gel silica film were studied, for obtaining hydrophobic coatings with high transparency. Polyethylene glycol (PEG) was added into silica sol to adjust the particle size. Two kinds of surface modification (sol treatment and film treatment respectively) by hexamethyldisilazane (HMDS) were employed and compared. The particle size evolvement was measured by dynamic scattering particle size analyzer. The surface morphology, water contact angle, chemical compositions, and transmittance were characterized by atomic force microscope (AFM), contact angle instrument, transmittance, FTIR and UV-Vis-IR spectrophotometers. Results showed that addition of PEG increased the silica particle size and accordingly the film surface roughness, which gave rise to a significantly improved hydrophobicity. The surface modification was impacted by the particle size. Small particle size is good for sol treatment, while large particle size is good for film treatment. PEG-film after HMDS atmosphere treatment could present superhydrophobicity with water contact angle of 152°, and high transmittance was maintained at the same time.
- silica film;surface structure;modification;hydrophobicity
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