Preparation and characterization of micron and submicron-sized vermiculite |
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| Authors: | L A Pérez-Maqueda O B Caneo J Poyato J L Pérez-Rodríguez |
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| Institution: | (1) Instituto de Ciencia de Materiales de Sevilla. CSIC-UNSE. Avd. Américo Vespucio s/n. Sevilla 41092 e-mail: maqueda@cica.es Fax: +34 954460665, |
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| Abstract: | The effect of ultrasounds on natural macroscopic vermiculite flakes has been studied. Conditions for the preparation of submicron
vermiculite particles of narrow particle-size distribution by sonochemistry are described. The resulting material is crystalline,
as assayed by X-ray diffraction. Effects of ultrasound treatment on the mean particle size, crystal structure, crystallite
dimensions in different directions, and specific surface area of the resulting particles are investigated. Under the conditions
used in this work, there is a practical limit at 40 h in the sonication time for the preparation of submicron particles; longer
treatment times promoted aggregation.
Received: 21 March 2000 / Accepted: 21 August 2000 |
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| Keywords: | Vermiculite Submicron particles Ultrasounds Sonication Sonochemistry |
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