Twisted Aspirin Crystals
Banded spherulites of aspirin have been crystallized from the melt in the presence of salicylic acid either generated from aspirin decomposition or added deliberately (2.6–35.9 mol %). Scanning electron microscopy, X-ray diffraction analysis, and optical polarimetry show that the spherulites are com...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
The American Chemical Society
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/35478 |
| _version_ | 1848754507808243712 |
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| author | Cui, X. Rohl, Andrew Shtukenberg, A. Kahr, B. |
| author_facet | Cui, X. Rohl, Andrew Shtukenberg, A. Kahr, B. |
| author_sort | Cui, X. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Banded spherulites of aspirin have been crystallized from the melt in the presence of salicylic acid either generated from aspirin decomposition or added deliberately (2.6–35.9 mol %). Scanning electron microscopy, X-ray diffraction analysis, and optical polarimetry show that the spherulites are composed of helicoidal crystallites twisted along the <010> growth directions. Mueller matrix imaging reveals radial oscillations in not only linear birefringence, but also circular birefringence, whose origin is explained through slight (~1.3°) but systematic splaying of individual lamellae in the film. Strain associated with the replacement of aspirin molecules by salicylic acid molecules in the crystal structure is computed to be large enough to work as the driving force for the twisting of crystallites. |
| first_indexed | 2025-11-14T08:41:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-35478 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:41:31Z |
| publishDate | 2013 |
| publisher | The American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-354782017-09-13T15:26:49Z Twisted Aspirin Crystals Cui, X. Rohl, Andrew Shtukenberg, A. Kahr, B. Banded spherulites of aspirin have been crystallized from the melt in the presence of salicylic acid either generated from aspirin decomposition or added deliberately (2.6–35.9 mol %). Scanning electron microscopy, X-ray diffraction analysis, and optical polarimetry show that the spherulites are composed of helicoidal crystallites twisted along the <010> growth directions. Mueller matrix imaging reveals radial oscillations in not only linear birefringence, but also circular birefringence, whose origin is explained through slight (~1.3°) but systematic splaying of individual lamellae in the film. Strain associated with the replacement of aspirin molecules by salicylic acid molecules in the crystal structure is computed to be large enough to work as the driving force for the twisting of crystallites. 2013 Journal Article http://hdl.handle.net/20.500.11937/35478 10.1021/ja400833r The American Chemical Society restricted |
| spellingShingle | Cui, X. Rohl, Andrew Shtukenberg, A. Kahr, B. Twisted Aspirin Crystals |
| title | Twisted Aspirin Crystals |
| title_full | Twisted Aspirin Crystals |
| title_fullStr | Twisted Aspirin Crystals |
| title_full_unstemmed | Twisted Aspirin Crystals |
| title_short | Twisted Aspirin Crystals |
| title_sort | twisted aspirin crystals |
| url | http://hdl.handle.net/20.500.11937/35478 |