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Interactions in Calcium Oxalate Hydrate/Surfactant Systems

✍ Scribed by M. Sikirić; N. Filipović-Vinceković; V. Babić-Ivančić; N. Vdović; H. Füredi-Milhofer

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
69 KB
Volume
212
Category
Article
ISSN
0021-9797

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✦ Synopsis

Phase transformation of calcium oxalate dihydrate (COD) into the thermodynamically stable monohydrate (COM) in anionic (sodium dodecyl sulfate (SDS)) and cationic (dodecylammonium chloride) surfactant solutions has been studied. Both surfactants inhibit, but do not stop transformation from COD to COM due to their preferential adsorption at different crystal faces. SDS acts as a stronger transformation inhibitor. The general shape of adsorption isotherms of both surfactants at the solid/liquid interface is of two-plateau-type, but differences in the adsorption behavior exist. They originate from different ionic and molecular structures of crystal surfaces and interactions between surfactant headgroups and solid surface. Copyright 1999 Academic Press.

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