کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9829770 | 1524498 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structure and morphology control of calcium oxalate using biopolymeric additives in crystallization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Using the acid-rich polymeric additives, poly-l-aspartate (polyD), poly-l-glutamate (polyE), and polyacrylate (polyAA), the structure and morphology of calcium oxalate crystals were controlled during crystallization. In crystallization without the polymeric additives, twinned calcium oxalate monohydrate (COM) crystals were preferentially produced. However, the structural shift of calcium oxalate from a monohydrate (COM) to a dihydrate (COD) form occurred gradually when increasing the polymeric additive concentration, then COD crystals were exclusively crystallized beyond certain critical concentrations of the additives. These critical concentrations actually depended on the molecular configurations of the additives that determined the capability to control the crystallization. When increasing the additive concentration far beyond the critical level, shape modifications without structural changes occurred from a normal octahedral shape (bi-pyramid) to a rod shape (elongated octahedral shape), followed by a dumbbell shape, and finally a sphere shape. Due to its high binding affinity to the crystal surface, polyAA exhibited the most effective elongation in the [0Â 0Â 1] direction and clearest development of {1Â 0Â 0} faces, while polyE had the least effect on the crystals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 279, Issues 1â2, 15 May 2005, Pages 154-162
Journal: Journal of Crystal Growth - Volume 279, Issues 1â2, 15 May 2005, Pages 154-162
نویسندگان
Taesung Jung, Woo-Sik Kim, Chang Kyun Choi,