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investigation is to investigate the possibility of using water based suspensions of nanosize boehmite particles to produce continious micron thick y-alumina films. EXPERIMENT Precursors were prepared by the mixing of nanosize boehmite powder with water and nitric acid. Homogenous colloidal suspensions with pH of about 4 containing up to 30w% alumina were made by ultrasonic processing of the suspensions for two days followed by filtration through 0.45[tm glass filter. The resulting suspensions had low viscosity (about the water). were semitransparent and stable for periods up to at least a year (at room temperature) for

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