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Characterization of water in bacterial cellulose using dielectric spectroscopy and electron microscopy

Krisitna Gelin ; Aase Bodin (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Paul Gatenholm (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Albert Mihranyan ; Katarina Edwards ; Maria Strömme
Polymer (0032-3861). Vol. 48 (2007), 26, p. 7623-7631.
[Artikel, refereegranskad vetenskaplig]

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 mols. in the gels is more or less tightly bound to the cellulose. The magnitude of the diffusion coeffs. 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 concn. used during the biosynthesis process of the gels.

Nyckelord: Dielectric spectroscopy; Bacterial cellulose; Water



Denna post skapades 2007-12-12.
CPL Pubid: 62855

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Fysik
Kemi

Chalmers infrastruktur