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Issue 35-36, 2005
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Functional nanostructured chitosansiloxane hybrids

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Abstract

New organic–inorganic hybrids were prepared by a sol–gel method from the biopolymer chitosan and a silane coupling agent, 3-isocyanatopropyltriethoxysilane (ICPTES), in which covalent bridges, essentially composed of urea, bond the chitosan to the poly(siloxane) network. The structural characterization of the advanced chitosansiloxane hybrids was performed by Fourier transform infrared spectroscopy, X-ray diffraction and 29Si and 13C nuclear magnetic resonance. The presence of siloxane nanodomains was detected by small angle X-ray diffraction. The chitosansiloxane hybrids are bifunctional materials with interesting photoluminescent features and bioactive behaviour. The photoluminescence spectra display an additional high-energy band with longer lifetime, relatively to the characteristic emission of pure chitosan. This band is associated with electron–hole recombinations arising from silicon-related defects at the surface of the siliceous nanodomains. The bioactive behaviour of these materials was also evaluated; the apatite formation was shown to depend on the amount and arrangement of silanol groups.

Graphical abstract: Functional nanostructured chitosan–siloxane hybrids

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Publication details

The article was received on 26 Apr 2005, accepted on 28 Jun 2005 and first published on 26 Jul 2005


Article type: Paper
DOI: 10.1039/B505875A
Citation: J. Mater. Chem., 2005,15, 3952-3961
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    Functional nanostructured chitosansiloxane hybrids

    S. S. Silva, R. A. S. Ferreira, L. Fu, L. D. Carlos, João. F. Mano, R. L. Reis and J. Rocha, J. Mater. Chem., 2005, 15, 3952
    DOI: 10.1039/B505875A

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