Chemicals and Chemistry
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Study results from University of Seville in the area of ultrasonics sonochemistry published
May 15th, 2009
According to recent research from Seville, Spain, "Sonication in a 1:1 mixture (volume ratio) of water and concentrated H2O2 (30%) is a soft method for particle size reduction of phyllosilicate minerals like vermiculites. Repeated sonication causes a particle size reduction to about 70 nm for the Santa Olalla and to 45 nm for the Ojen-vermiculite."
"In this context the question arises whether the strong oxidising effect of the hydrogen peroxide affects the oxidation state of the iron in the vermiculites. Therefore, the Fe3+/Fe-total ratio before and after sonication was determined by means of Mossbauer spectroscopy. Whereas this ratio was found to remain almost constant in...
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Source: Chemicals and Chemistry (2009-05-15)