Morphological Characterization of γ-Al2O3 Membranes Fabricated from Ammonium Aluminum Sulphate

摘要

Supported 0γ-Al<,2>O<,3> membranes without defects were prepared by the sol-gel procedure. The sol-gel method involved peptization of a boehmite (AIOOH) sol prepared from ammonium aluminium sulphate. The morphology of the supported membranes was characterized by scanning electron microscopy (SEM) and 3D rotational microscopy. Furthermore, the effects of different preparing conditions on morphological characteristics of the membrane were also investigated. The results show that PVA is a good crack-preventing agent and the morphology of supported membranes is affected by many factors, such as Al<,2>O<,3> and PVA contents of the sol, drying and sintering procedures and intrinsic defects on the substrate surface.