Rheology and gelling behaveor of boehmite sols

M. A. Islam, Chu Chi Ming, Pogaku Ravindra, Eng Seng Chen

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

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 δEn 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.

Original languageEnglish
Pages (from-to)2327-2333
Number of pages7
JournalJournal of Applied Sciences
Volume11
Issue number13
DOIs
Publication statusPublished - 2011
Externally publishedYes

Keywords

  • Activation energy
  • Flow behavior index
  • Pseudoplastic behavior
  • Rheology
  • Sol-gel

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