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Study on Superhydrophobic Modification of Al2O3 Microfiltration Membrane

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Author(s): HOU Wei-Min, YU Yun, HU Xue-Bing, YU Yang, MI Le, SONG Li-Xin

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 8;
Start page: 864;
Date: 2013;
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Keywords: multi-layer assembly; superhydrophobic; roughness; micro-nanometer morphology

ABSTRACT
TiO2 nano-coating with superhydrophobic surface was initially prepared through depositing TiO2 nanoparticles on the surface of porous Al2O3 microfiltration membrane by multi-layer assembly technology, then followed by a fluorination surface treatment with 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDS). X-ray diffractometer (XRD), fourier transform infrared spectroscope (FTIR), atomic force microscope (AFM), water contact angle measurements (WCA) and scanning electron microscope (SEM) were used for membrane characterization. The crystalline structure of TiO2 nano-coating was analysed. The relationship among TiO2 nanoparticles deposition time, surface roughness and hydrophobicity was discussed. The influence of grafting time on the morphology and hydrophobicity was also researched. The result shows that with TiO2 nano-coating anatase structure is fabricated by annealing at 600¡æ for 1 h, With the increase of TiO2 nanoparticles deposition time, the surface becomes rougher, and the state of water droplets on it transforms from Wenzel to Cassie contact. When the TiO2 nanoparticles deposition time is 50 min and the TiO2 coating is grafted for three times, an ideal superhydrophobic surface of micro-nanometer morphology is obtained with water contact angle of 174.5°.
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