Never-dried cellulose membranes

Later the same research group claimed that, in the first step of the in situ synthesis scheme, ionic functional groups as such are not necessary for the introduction of ferrous ions into a cellulose matrix [161,162], This suggestion was made based on a comparative study of ferrite synthesis between a case with anionically modified cellulose materials and the other case with non-ionic cellulose gels, which included a never-dried bacterial cellulose (BC) membrane and a never-dried cellulose wet-spun filament or cast film (Lyocell) using N-methylmorpholin-N-oxide as the solvent. SPM proper-... 

Figure 10.4 The never-dried bacterial cellulose membrane is a non-pyrogenic and fuUy biocompatible biomaterial with high mechanical strength.

Figure 16.3 A never-dried microbial cellulose membrane shows remarkable conformabUity to the various body contours, maintains a most environment, and significantly reduces pain (image courtesy of the Centre of Burn Healing, Siemianowice Slakie, Poland and Prof Stanislaw Bielecki of the Institute of Technical Biochemistry, Technical University of Lodz, Poland).

The substances generally used as osmotic membranes include collodion (nitrocellulose of 11-13.5 per cent nitrogen) regenerated cellulose, obtained by denitration of collodion gel cellophane that has never permitted to dry after manufacture bacterial cellulose, obtained by the action of certain strains of bacteria rubber, poly (vinyl alcohol) polyurethances poly (vinyl butyral) and polychlorotrifluoroethylene. At present gel cellophane is most widely used. 

Gel Gellophane n Regenerated cellulose which has never been allowed to dry out, but has always been stored swollen with water or other solvent. Thin films are frequently used as the semi-permeable membrane in membrane Osmometry. 

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