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Characterization of water in bacterial cellulose using dielectric spectroscopy and electron microscopy
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
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2007 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 48, no 26, 7623-7631 p.Article in journal (Refereed) Published
Abstract [en]

It is shown that only 10% of the 99 wt% water present in bacterial cellulose (BC) gels, produced by Acetobacter xylinum, behave like free bulk water; the majority of the water molecules in the gels is more or less tightly bound to the cellulose. The magnitude of the diffusion coefficients of ions transported in the water phase of the BC gels as well as the information contained in freeze fracture transmission electron microscopic images of the gel structures indicates that the bulk-like water is confined in “lakes” rather than forming a continuous phase throughout the gel. Water desorption isotherms suggest that these “lakes” decrease in size with increasing oxygen concentration used during the biosynthesis process of the gels.

Place, publisher, year, edition, pages
2007. Vol. 48, no 26, 7623-7631 p.
Keyword [en]
dielectric spectroscopy, bacterial cellulose, water
National Category
Chemical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-12479DOI: 10.1016/j.polymer.2007.10.039ISI: 000252289000024OAI: oai:DiVA.org:uu-12479DiVA: diva2:40248
Available from: 2007-12-27 Created: 2007-12-27 Last updated: 2017-12-11Bibliographically approved

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Gelin, KristinaMihranyan, AlbertEdwards, KatarinaStrømme, Maria

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