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The influence of adsorbed anionic and cationic surfactants on the phase transformation of calcium oxalate hydrates (CROSBI ID 468388)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Babić-Ivančić, Vesna ; Filipović-Vinceković, Nada ; Sikirić, Maja ; Füredi-Milhofer, Helga The influence of adsorbed anionic and cationic surfactants on the phase transformation of calcium oxalate hydrates // Book of Abstracts - 15th European Chemistry at Interfaces Conference. Jeruzalem, 1998. str. 168-x

Podaci o odgovornosti

Babić-Ivančić, Vesna ; Filipović-Vinceković, Nada ; Sikirić, Maja ; Füredi-Milhofer, Helga

engleski

The influence of adsorbed anionic and cationic surfactants on the phase transformation of calcium oxalate hydrates

Crystalization of calcium oxalate dihydrate , CaC2O4 . (2 + xH2O ,x ? 0,5) , COD and monohydrate , CaC2O4 . H2O , COM , has been extensively studied in our group because of the importance of these compounds as the main constituents of kidney stone. It was found1,2 that micellar solutions of anionic , but not cationic surfactants can promote crystallization of COD on account of COM, when – without surfactant – the latter is the prevailing crystallizing phase. In this paper we present recent results on the phase transformation of prepared, well defined crystals of COD into the thermodynamically stable COM in micellar solutions of an anionic (sodium dodecyl sulphate, SDS) and a cationic (dodecylammonium chloride, DDACl) surfactant. To keep the experimental conditions close to those prevailing in urines, experiments were carried out at 370 C in 0,3 molar sodium chloride solutions containing 0,02 molar calcium chloride and preadjusted to pH 6.5 . Well characterized COD crystals with an average BET N2 surface area of 2,5 m2 /g were immersed into these solutions to which different concentrations of SDS or DDACl were added. Phase transformation was followed through several days by periodically withdrawing samples and identifying the solid phases formed by X-ray powder diffraction, thermogravimetric analysis and optical and scanning electron microscopy. In the blank system transformation was completed within 7 days, while in micellar solutions of both surfactants transformation was significantly inhibited. SDS was found to be a stronger inhibitor of phase transformation than DDACl, which is in accordance with the results of adsorption studies showing stronger adsorption of the anionic surfactant on both COM and COD crystal/ solution interfaces. References 1. D.Skrtic and N.Filipovic-Vincekovic, J. Crystal Growth, 88 (1988) 313 2. H. Füredi – Milhofer, L. Tunik, N. Filipović-Vinceković, D.Škrtić, V. Babić-Ivančić, N. Garti, Scanning Microscopy, 9 (1995) 1061

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Podaci o prilogu

168-x.

1998.

objavljeno

Podaci o matičnoj publikaciji

Book of Abstracts - 15th European Chemistry at Interfaces Conference

Jeruzalem:

Podaci o skupu

15th European Chemistry at Interfaces Conference

poster

18.10.1998-22.10.1998

Jeruzalem, Izrael

Povezanost rada

Šumarstvo