Md. Alimul Islam and Chu, Chi Ming and Pogaku, Ravindra and Chan, Eng Seng (2011) Rheology and gelling behavior of boehmite sols. Journal of Applied Sciences, 11 (13). pp. 2327-2333. ISSN 1812-5654
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Abstract
Rheological studies of boehmite sols based on pH was (1) to study the nature of flow properties of the boehmite sols and (2) to identify the sol-gel transition of boehmite sols with the change of pH of the liquid. It is evident that the shear rate and viscosity of the liquid exhibit a pseudoplastic (shear thinning) flow behavior for all pH level. The transformation of sol-gel at low pH probably due to the hydrogen bond between the layers of the boehmite structure. The temperature has an appreciable effect on the activation energy during the sol-gel transition. The flow activation energies δE n are in the range of 1.75 to 6.25 J mol -1 at temperature 298-384 K. Based on these results, the flow activation energy of boehmite sols sharply decreases with decreasing the pH. The flocculation of the suspension at pH 4 to 1 showed to be favorable in term of enhanced density of boehmite.
| Item Type: | Article |
|---|---|
| Keyword: | Activation energy, Flow behavior index, Pseudoplastic behavior, Rheology, Sol-gel |
| Subjects: | ?? QE351-399.5 ?? |
| Department: | SCHOOL > School of Engineering and Information Technology |
| Depositing User: | ADMIN ADMIN |
| Date Deposited: | 10 Oct 2012 17:09 |
| Last Modified: | 20 Oct 2017 14:01 |
| URI: | https://eprints.ums.edu.my/id/eprint/5086 |
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