Abstract
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.
Similar content being viewed by others
References
F. Figueraus, Catal. Rev. Sci. Eng. 30 (1988) 457.
T. J. Pinnavaia, Science 220 (1983) 4595.
D. Plee, F. Borg, L. Gatineau and J. J. Fripiat. J. Am. Chem. Soc. 107 (1985) 2362.
Mario L. Ocelli, in “Proceedings of the International Clay Conference”, Denver, edited by L. G. Schultz, H. Van Olphen and F. A. Mumpton (The Clay Mineral Society, Bloomington, IN, 1987) p. 319.
S. K. Ghosh, P. Mukundan, K. G. K. Warrier and A. D. Damodaran, J. Mater. Sci. Lett. 10 (1991) 1193.
S. Yamanaka and M. Hattori, in “Chemistry of Microporous Crystals”, Proceedings of the International Symposium on Chemistry of Microporous Crystals. Tokyo, 26–29 June 1990, edited by T. Inui, S. Namba and T. Tatsumi (Elsevier, Tokyo, 1991) p. 89.
S. Yamanaka and G. W. Brindley, Clays Clay Miner. 27 (1979) 119.
R. Molina, A. Vieira-Coelho and G. Poncelet, ibid. 40 (1992) 480.
D. W. E. Vaughan, Catal. Today 2 (1988) 187.
K. Thakhama, M. Yokoyama and S. Yamanaka, J. Mater. Sci. 27 (1992) 1297.
D. Michael, P. Mingos and D. R. Baghurst, Chem. Soc. Rev. 20 (1991) 1.
A. C. Pierre and D. R. Uhlmann, in “Ultrastructure processing of advanced ceramics”, edited by J. D. Mackenzie and D. R. Ulrich (Wiley, Interscience, New York, 1988) p. 865.
S. Bhatacharjee, Ind. J. Pure Appl. Phys. 9 (1971) 1054.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Warrier, K.G.K., Mukundan, P., Ghosh, S.K. et al. Microwave drying of boehmite sol intercalated smectites. JOURNAL OF MATERIALS SCIENCE 29, 3415–3418 (1994). https://doi.org/10.1007/BF00352042
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00352042