The copolymerization of โฃ-methylene-โฅ-butyrolactone and methyl methacrylate in DMSO was studied by on-line Raman spectroscopy. Reactivity ratios for this system were estimated from the in situ conversion measurements. The estimates are in good agreement with estimates obtained from low-conversion ex
โฆ LIBER โฆ
In situ Raman spectroscopy applied to electrochemical scaling. Determination of the structure of vaterite
โ Scribed by C. Gabrielli; R. Jaouhari; S. Joiret; G. Maurin
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 195 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0377-0486
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โฆ Synopsis
The Raman spectrum of vaterite prepared by electrochemical scaling in carbonically pure water is presented and analysed following the rules of group theory. It is shown that only one of the three crystallographic determinations already proposed for the structure of vaterite is compatible with the results obtained. Then it is shown that the formation of aragonite on a vaterite crystal is a transformation of the vaterite structure and not a further crystallization of this polymorph upon vaterite crystals.
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๐
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โ 225 KB
๐ 2 views