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Influence of Acidity on the Electrostatic Stability of Alumina Suspensions in Ethanol
Author(s) -
Wang Gonghou,
Sarkar Partho,
Nicholson Patrick S.
Publication year - 1997
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.1151-2916.1997.tb02928.x
Subject(s) - dlvo theory , turbidity , chemistry , electrophoresis , electrostatics , aqueous solution , electrostatic interaction , chemical engineering , ethanol , ion , surface charge , inorganic chemistry , particle (ecology) , chromatography , chemical physics , colloid , organic chemistry , oceanography , engineering , geology
Alumina (Al 2 O 3 ) powders have been dispersed in ethanol (EtOH) solutions of different acidity. In aqueous media, acidity is defined by pH. This definition can be extended to nonaqueous media using ion‐transfer functions. The electrical charge on the particle surfaces has been found to be acidity dependent. The electrostatic stability of Al 2 O 3 EtOH suspensions has been evaluated via electrophoresis and turbidity. An electrostatic stabilization mechanism is proposed and analyzed via Derjaguin–Landau–Verwey–Overbeek (DLVO) theory.