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Effect of the Cobalt Ion and Polyethyleneimine Adsorption on the Surface Forces between Tungsten Oxide and Cobalt Oxide in Aqueous Media
Author(s) -
Andersson Karin M.,
Bergström Lennart
Publication year - 2002
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.1151-2916.2002.tb00472.x
Subject(s) - cobalt , adsorption , tungsten , aqueous solution , cobalt oxide , oxide , inorganic chemistry , ion , chemistry , colloid , materials science , electrolyte , chemical engineering , organic chemistry , engineering , electrode
We used the colloidal probe technique with atomic force microscopy to study the interactions between a tungsten oxide sphere, WO 3 , and flat oxidized tungsten and cobalt surfaces in aqueous electrolytes. We investigated the effects of adsorption of cobalt ions to tungsten oxide surfaces and adsorption of polyethyleneimine (PEI). Low concentrations of cobalt ions added to a WO 3 system resulted in extended hydration forces and a lowering of the absolute value of the surface potential. PEI was shown to adsorb to the WO 3 surfaces and induce an electrosteric repulsion in both the symmetric (WO 3 –WO 3 ) and asymmetric (WO 3 –CoOOH) systems. The possible complexation of cobalt ions with PEI does not significantly influence the thickness of the adsorbed layer.