Journal of Materials Science

, Volume 29, Issue 13, pp 3415–3418 | Cite as

Microwave drying of boehmite sol intercalated smectites

  • K. G. K. Warrier
  • P. Mukundan
  • S. K. Ghosh
  • S. Sivakumar
  • A. D. Damodaran


Monohydroxy aluminium oxide (boehmite) intercalated (cross-linked) smectites (SCLS) have been prepared from an aqueous suspension containing sodium mono-ion-exchanged bentonite (2 wt%) and boehmite (AlOOH) sol at pH 3.5 and at 32 °C. The SCLS has been separated by centrifugation and repeated washing. The intercalated smectite was dried in an oven at 60 °C over a period of 24 h and also in a microwave oven of 2.45 GHz frequency and 600 W power over a range of 3–15 min. Both samples have identical thermal and electrical properties. However, the microwave-dried samples have a distinctly higher surface area of 120 m2 g−1, stable up to 650 °C with a marginal reduction to 116 m2 g−1 compared with 94 m2g−1 for the oven-dried sample. Similarly there was clear difference in the morphological features of the two samples, the air-dried sample having a close packed structure while the microwave one is delaminated and porous.


Polymer Aluminium Microwave Centrifugation Morphological Feature 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • K. G. K. Warrier
    • 1
  • P. Mukundan
    • 1
  • S. K. Ghosh
    • 1
  • S. Sivakumar
    • 1
  • A. D. Damodaran
    • 1
  1. 1.Regional Research Laboratory (CSIR)ThiruvananthapuramIndia

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