| Study of Crack Formation and their Elimination in
Alumina Membranes from Chelated Sol-gel Precursors |
MAHUA SINGH, M. K. TRIVEDI AND JAYESH BELLARE
Pages : 82-84
DOI :10.1080/0371750X.1997.10804799 |
| Abstract |
| Alumina membranes for gas separation were made using
chelated alkoxide, through the sol-gel route. Use of chelated
alkoxides p.-events the uncontrolled hydrolysis of aluminium
alkoxides and gives l"ise to a modified precursm· that gives finer
particle size and lower alumina ct·ystallization temperatule.
However, chelated alkoxide membranes crack extensively. The
type of chelating agent and the amount of chelating agent and
water used for hydrolysis were found to affect crack formation.
Crack-free membranes could be successfully prepared with
alkoxide/chelating agent ratios less than l : 0.75 using ethylacetoacetate
as the chelating agent. These membranes were
tested for their integt·ity using scanning electron miciOscopy
and nitrogen permeability measure-ments. Crackl.d
membranes showed considerably high petmfahility compared
to uncracked ones. |
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