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High- and low-charge vermiculites from Spain (Santa Olalla and Ojén) were sonicated in an ultrasonic liquid processor to produce changes in particle size, morphology and structural ordering. The ultimate aim of this treatment was to prepare 18 Å Al-pillared vermiculites. Sonication caused a rise of the S BET from the initial value 1 m 2 g −1 of the raw samples to 36 and 54...
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