Sustainable-solvent-induced polymorphism in chitin films
We report a simple route to produce chitin films with different crystalline structures. The use of a green deep-eutectic-solvent (DES) choline chloride : urea (CCU) or hexafluoroisopropanol (HFIP) allows fine-tuning of the crystallization process to produce films with β-dihydrated- or γ-chitin struc...
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Veröffentlicht in: | Green chemistry : an international journal and green chemistry resource : GC 2016, Vol.18 (15), p.433-4311 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We report a simple route to produce chitin films with different crystalline structures. The use of a green deep-eutectic-solvent (DES) choline chloride : urea (CCU) or hexafluoroisopropanol (HFIP) allows fine-tuning of the crystallization process to produce films with β-dihydrated- or γ-chitin structures. With the advent of a Grazing-Incidence X-Ray Diffraction (GIXD) technique, we propose a new and fully indexed structure of γ-chitin. This new γ-structure is modeled as a super-cell, in contrast to the idea of a simple physical mixture of α and β phases. The influence of purification, dissolution or dispersion media on chitin's crystallinity was investigated by FTIR, solid-state NMR and XRD. Results presented here may trigger applications in which a well-defined crystalline structure is required.
We report a simple route to produce chitin films with different crystalline structures. |
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ISSN: | 1463-9262 1463-9270 |
DOI: | 10.1039/c6gc00628k |