Liesegang banding and multiple precipitate formation in cobalt phosphate systems

A colorful multi-component Liesegang pattern of cobalt phosphates is prepared and analyzed. [Display omitted] ► A Liesegang pattern of cobalt phosphate in gelatin is prepared in a 1D tube. ► The pattern displays three main regions: uniform brown and blue zones followed by violet Liesegang bands. ► T...

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Bibliographic Details
Published in:Chemical physics letters 2012-02, Vol.525-526, p.54-59
Main Authors: Karam, Tony, El-Rassy, Houssam, Zaknoun, Farah, Moussa, Zeinab, Sultan, Rabih
Format: Article
Language:English
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Summary:A colorful multi-component Liesegang pattern of cobalt phosphates is prepared and analyzed. [Display omitted] ► A Liesegang pattern of cobalt phosphate in gelatin is prepared in a 1D tube. ► The pattern displays three main regions: uniform brown and blue zones followed by violet Liesegang bands. ► The precipitates are characterized by FTIR, SEM, EDX and XRD. ► The violet bands consist of anhydrous Co3(PO4)2. ► The blue zone is cobalt phosphate tetrahydrate. ► With time, the pattern disintegrates into more highly hydrated cobalt phosphates. We study a cobalt phosphate Liesegang pattern from cobalt(II) and phosphate ions in a 1D tube. The system yields a complex, multi-component pattern. Characterization of the different precipitates by FTIR, SEM and XRD reveals that they are cobalt phosphate polymorphs with different degrees of hydration.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2011.12.048