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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/F5C036C3-94A6-40F3-BB12-EBA3BA5553BD | ||
| Year | 2010 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | M.J Bonné, E. Galbraith, T. D James, M.w J Wasbrough, K. J Edler, A T. A Jenkins, M. Helton, A. McKee, W.Thielemans, E. Psillakis, F. Marken , "Boronic acid dendrimer receptor modified nanofibrillar cellulose membranes ",J. of Mat. Ch.,vol. 20 ,no.3 ,pp.588-594,2010.doi:10.1039/b918308f https://doi.org/10.1039/b918308f | ||
| Appears in Collections |
Cellulose nanofibrils from sisal of typically 4–5 nm diameter and ca. 250 100 nm length arereconstituted into thin films of ca. 6 mm thickness (or thicker freestanding films). Pure cellulose andcellulose composite films are obtained in a solvent evaporation process. A boronic acid appendeddendrimer is embedded as a receptor in the nanofibrillar cellulose membrane. The number of boronicacid binding sites is controlled by varying the dendrimer content. The electrochemical andspectrophotometric properties of the nanocomposite membrane are investigated using the probemolecule alizarin red S. Pure cellulose membranes inhibit access to the electrode. However, thepresence of boronic acid receptor sites allows accumulation of alizarin red S with a Langmuirianbinding constant of ca. 6000 1000 M1. The 2-electron 2-proton reduction of immobilized alizarinred S is shown to occur in a ca. 60 nm zone close to the electrode surface. With a boronic aciddendrimer modified nanofibrillar cellulose composition of 96 wt% cellulose and 4 wt% boronic aciddendrimer, the analytical range for alizarin red S in aqueous acetate buffer pH 3 is approximately 10mM to 1 mM.
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