The Influence of Surfactants on the Crystallization of Calcium Oxalate Hydrates

Helga Füredi-Milhofer Casali Institute of Applied Chemistry, The Fred and Nadine Hermann Graduate School of Applied Sciences, the Hebrew University of Jerusalem, Jerusalem, Israel

Leonid Tunik Casali Institute of Applied Chemistry, The Fred and Nadine Hermann Graduate School of Applied Sciences, the Hebrew University of Jerusalem, Jerusalem, Israel

Raphael Bloch Casali Institute of Applied Chemistry, The Fred and Nadine Hermann Graduate School of Applied Sciences, the Hebrew University of Jerusalem, Jerusalem, Israel

Nissim Garti Casali Institute of Applied Chemistry, The Fred and Nadine Hermann Graduate School of Applied Sciences, the Hebrew University of Jerusalem, Jerusalem, Israel

Abstract

The influence of sodium dodecyl sulphate, SDS, dodecyl ammonium chloride, DDACl and octaethylene glycol mono-n-hexadecyl ether, C₁₆EO₈, on the crystallization of calcium oxalate from 0.3 molar sodium chloride solutions is discussed. Under the given experimental conditions the thermodynamically stable monohydrate, COM was the predominant crystal form. Both ionic surfactants inhibited growth and aggregation of COM and, by preferential adsorption at different crystal faces, induced different habit modifications. In addition, micellar solutions of SDS promoted crystallization of the metastable calcium oxalate dihydrate, COD. The nonionic surfactant, C₁₆EO₈, stimulated nucleation and/or initial crystal growth of COM, most probably by providing active centers for heterogeneous nucleation.

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The Influence of Surfactants on the Crystallization of Calcium Oxalate Hydrates

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The Influence of Surfactants on the Crystallization of Calcium Oxalate Hydrates

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