Study on Superhydrophobic Modification of Al2O3 Microfiltration Membrane

doi:10.3724/SP.J.1077.2013.12600

Abstract

Abstract: TiO₂nano-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 TiO₂nanoparticles 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℃ 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°.

Key words: multi-layer assembly, superhydrophobic, roughness, micro-nanometer morphology

CLC Number:

O647

HOU Wei-Min, YU Yun, HU Xue-Bing, YU Yang, MI Le, SONG Li-Xin. Study on Superhydrophobic Modification of Al₂O₃ Microfiltration Membrane[J]. Journal of Inorganic Materials, 2013, 28(8): 864-868.

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Study on Superhydrophobic Modification of Al₂O₃ Microfiltration Membrane

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