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Scanning electron microscopic study of the fine surface features of synthetic calcium oxalate mono hydrate crystals


Scanning Electron Microscopy (1): 185-198
Scanning electron microscopic study of the fine surface features of synthetic calcium oxalate mono hydrate crystals
Extensive experimentation was conducted to develop a suitable gel growth system for the production of high-quality, non-poisoned calcium oxalate monohydrate (COM) crystals. Three gel systems were emplyed: bentonite clay; unexchanged sodium metasilicate; and ion-exchanged sodium metasilicate. These gels produced different results when different concentrations of several calcium and oxalate salts were used at varied pH. Clay inclusions in bentonite-grown COM crystals occurred as a function of pH-controlled adsorption characters of the clay. A new model for the adsorption of crystal growth inhibitors onto crystal surfaces is proposed on the basis of this result. Unexchanged sodium metasilicate gel was a less favorable gel than its ion-exchanged counterpart and this latter gel was found best for the reproducible growth of larger, more perfect COM crystals. Examination of the fine surface features of crystals was a useful tool in judging crystal growth environments. Synthetic crystal growth in gel systems, in general, is evaluated as a tool for studying similar crystals naturally occurring in plants.


Accession: 006365115



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