Abstract
The fabrication of asymmetric alumina ultrafiltration membranes using acetic acid surface stabilized alumina nanoparticles (A-alumoxanes) has been investigated. Contacting α-alumina supports with an aqueous solution of A-alumoxane (after firing to 1000°C) yields a defect free alumina membrane with a thickness of ca. 2 μm. The alumoxane-derived membranes have a molecular weight cut-off in the range of 35,000–44,000 g mol −1, high porosity, and a permeability that is comparable to or greater than that of commercially available alumina membranes. SEM and AFM show that the surface of the alumoxane-derived membranes is quite smooth and contact angles show that the membrane is hydrophillic. A comparison with commercial alumina and polymer membranes, as well as those derived from sol–gel methods is presented.
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