1. Preparation of cellulose II and IIII films by allomorphic conversion of bacterial cellulose I pellicles.
- Author
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Faria-Tischer, Paula C.S., Tischer, Cesar A., Heux, Laurent, Le Denmat, Simon, Picart, Catherine, Sierakowski, Maria-R., and Putaux, Jean-Luc
- Subjects
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CELLULOSE , *PSEUDOMORPHS , *ATOMIC force microscopy , *TRANSMISSION electron microscopy , *NUCLEAR magnetic resonance spectroscopy , *CRYSTALLINITY , *X-ray diffraction - Abstract
The structural changes resulting from the conversion of native cellulose I (Cel I) into allomorphs II (Cel II) and III I (Cel III I ) have usually been studied using powder samples from plant or algal cellulose. In this work, the conversion of Cel I into Cel II and Cel III I was performed on bacterial cellulose films without any mechanical disruption. The surface texture of the films was observed by atomic force microscopy (AFM) and the morphology of the constituting cellulose ribbons, by transmission electron microscopy (TEM). The structural changes were characterized using solid-state NMR spectroscopy as well as X-ray and electron diffraction. The allomorphic change into Cel II and Cel III I resulted in films with different crystallinity, roughness and hydrophobic/hydrophilicity surface and the films remained intact during all process of allomorphic conversion. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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