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Dissolution and Gelation of Cellulose in TBAF/DMSO Solutions: The Roles of Fluo...
Östlund, Åsa; Lundberg, Dan; Nordstierna, Lars; Holmberg, Krister; Nydén, MagnusSolutions of cellulose in a mixture of tetrabutylammonium fluoride and dimethyl sulfoxide (TBAF/DMSO) containing small and varying amounts of water were studied by nuclear magnetic resonance (NMR). By measuring the composition dependences of 19F NMR and 1H NMR chemical shifts and line widths, details on the dissolution and gelation mechanisms for cellulose in TBAF/DMSO were elucidated. Our results suggest that ...
Oxidation of azo dyes in oil-in-water microemulsions catalyzed by metalloporphy...
Häger, Maria; Holmberg, Krister; Rocha Gonsalves, António M. d'A.; Serra, Arménio C.Hydrogen peroxide oxidation of two aqueous azo dyes, methyl orange and amaranth, catalyzed by manganese porphyrins, have been performed in an oil-in-water microemulsion based on a nonionic surfactant, C12E8. A lipophilic acid was used as cocatalyst in a variable amount. The oxidation was followed by UV spectroscopy. It was shown that the reactions performed in the microemulsion were rapid for both dyes and the ...
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