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Surface Charge of Alumina and Magnesia in Aqueous Media
Author(s) -
ROBINSON McDONALD,
PASK J. A.,
FUERSTENAU D. W.
Publication year - 1964
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1964.tb13801.x
Subject(s) - calcination , solubility , surface charge , aqueous solution , chemistry , materials science , inorganic chemistry , chemical engineering , analytical chemistry (journal) , chromatography , biochemistry , engineering , catalysis
By streaming potential measurements, the zero point of charge (zpc) of or‐Al 2 O 3 having a fully hydroxylated surface was found to occur at pH 9.2 ± 0.2. By calcining the alumina at temperatures above 1000°C, the zpc was lowered to about pH 6.7. By aging the calcined material in water at room temperature for a period of weeks, the surface was rehydroxylated and the zpc increased. The zpc of MgO occurred at pH 12.5 f 0.5. Because of its high solubility, the zpc of MgO was not affected by heat treatment.