Abstract

A study of the crystal growth of sodium oxalate from aqueous solution, by in situ optical microscopy and atomic force microscopy (AFM), is reported. Growth of single crystals has been monitored in situ by optical microscopy, with measurements of growth on the {0 0 1} and {2 0 0} faces. The effects of temperature and solution supersaturation on growth rate were studied. Simultaneous action of more than one growth mechanism is suggested as a possible explanation for the unusually high growth order obtained for the {0 0 1} faces in particular. Observations from ex situ AFM support this suggestion of multiple mechanisms of growth over the experimental concentration range examined. In situ AFM was conducted for the first time on growing sodium oxalate crystals. The {0 0 1} and {2 0 0} faces were imaged at low supersaturation and room temperature, displaying step spreading with some apparent nucleation. Growth rate dispersion was observed under all experimental conditions examined in this study.

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