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The Electrical Double Layer at Hydrous Manganese Dioxide/Electrolyte Interface

✍ Scribed by Sushree Swarupa Tripathy; Sukriti Bhusan Kanungo; Santosh Kumar Mishra

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
121 KB
Volume
241
Category
Article
ISSN
0021-9797

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✦ Synopsis

The interfacial properties of two hydrous oxides of manganese, namely an amorphous variety and a poorly crystalline synthetic birnessite, in different electrolyte media, have been studied by using a batch potentiometric titration procedure with a 72-h equilibration period. The data obtained by this procedure are more relevant to a natural water system than those obtained by the rapid titration method as reported earlier [J. Colloid Interface Sci. 131, 103 (1989).]. Although the points of zero charge do not show any major variations, the surface dissociation and complexation (with Na + in NaCl) constants differ with the method of titration. Both of the samples are characterized by their high surface charge (low pK a ) and surface potential, and as a result, complexation takes place possibly within the inner helmholtz plane. It is concluded that the triple-layer model is not applicable to this colloid system and that a basic Stern model would be more suitable in this case.

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