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1 Materials Science Poland

1 2015

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Preparation and characterization of multilayer mesoporous gamma-alumina membrane obtained via sol-gel using new precursors

Tafrishi R., Taheri-Nassaj E., Sadighzadeh A., Eskandari M. J.

Materials Science Poland

2015

Vol. 33, No. 4

792--798

In this paper, a mesoporous gamma-alumina membrane coated on a macroporous alpha-alumina support via sol-gel method has been reported. A crack-free gamma-alumina membrane was obtained by adding PVA to the alumina solution and optimum parameters of roughness, temperature and porosity were achieved. The support was dip-coated in different solutions using two new different solvents with different particle size distributions. Using these two solvents led to the uniform distribution of pore size in the final membrane. The alumina sols showed particle size distributions in the range of 20 to 55 nm which was measured by a DLS Zeta Sizer. X-ray diffraction technique, atomic force microscopy and scanning electron microscopy were used to characterize the membrane layer. XRD and DTA data for the gamma-alumina membrane showed its thermal stability up to around 600 degrees C. The thickness of the mesoporous gamma-alumina membrane was about 4 mu m with 16 nm of surface roughness and 5 nm pore size. The resultant crack-free mesoporous membrane shows that the membrane preparation procedure was optimum. In this work, it has been investigated the performance of gamma-alumina membranes for single gas permeation and separation of binary gas mixtures.