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Laboratory investigation reveals diverse crystal growth patterns in L-ascorbic acid methanol solutions, highlighting humidity and concentration controls on crystal morphology.
Morphological diagram with respect to crystal growth of L -ascorbic acid (C 6 H 8 O 6 ; so-called vitamin C) from methanol solution on a flat glass dish is presented. Varying humidity and initial concentration of L -ascorbic acid in methanol solution, the following three distinct kinds of growing patterns have been observed: homogeneous disk, concentric ring and dendrite. In addition, in higher concentration clearly faceted small single crystals grow in any humidity less than 90%. Crossovers from one pattern to another were observed, too.
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Ito et al. (2003) studied this question.
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