Abstract
Metal-carrying polysaccharides based on chitosan and a collagen-chitosan composite (collachit) were obtained by modifying polymers by Au and Fe nanoparticles, which were prepared via metal vapor synthesis. Gold nanoparticles were synthesized using organosols with triethylamine; Fe nanoparticles, using the thermally labile bis(arene) complex, viz., bis(toluene)iron. The composition and structures of the resulting materials were studied by Mössbauer spectroscopy, XPS, and X-ray diagnostics using synchrotron radiation. Particles of Au (7.5–10 nm) and Fe (6–7 nm) were detected in metallopolymers by X-ray powder diffraction. The XPS analysis of gold-containing nanocomposites showed two states of Au4f. One of them is metallic with the binding energy of the Au4f7/2 peak equal to 83.8 eV, and another one is partially oxidized with the binding energy of the Au4f7/2 peak equal to 85.5 eV; the atomic concentrations of the two states are 16% and 84%, respectively. A comparative analysis of the Mössbauer spectra of iron-containing chitosan and collachit demonstrated that these two samples have similar structures. Thus, iron is present as a metallic phase (−30%) and a superparamagnetic gamma-iron oxide (−74%). The size of gamma-iron oxide nanoclusters in the samples can be estimated at −6–8 nm.
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Dedicated to the memory of Academician N. K. Kochetkov (1915–2005) on the 100th anniversary of his birth.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1663–1670, July, 2015.
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Vasil´kov, A.Y., Rubina, M.S., Naumkin, A.V. et al. Metal-containing systems based on chitosan and a collagen-chitosan composite. Russ Chem Bull 64, 1663–1670 (2015). https://doi.org/10.1007/s11172-015-1057-5
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DOI: https://doi.org/10.1007/s11172-015-1057-5