Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 238, Issue 1, Pages 225-227Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jcis.2001.7484
Keywords
indium oxide; gallium oxide; point of zero charge; isoelectric point
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Electrokinetic measurements and potentiometric titrations of indium oxide (commercially available reagent grade powder, washed with NaOH and HNO3 to remove strongly adsorbed species) indicate the pristine point of zero charge to be pH 8.7. The isoelectric point at pH 9 was obtained for gallium oxide prepared in the same way. These values match the pristine point of zero charge of alumina, but they are much higher than the values reported for indium oxide and gallium oxide in the literature. (C) 2001 Academic Press.
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