Abstract
Stabilization of metallic nanoparticles may be achieved by the formation of their adducts with polymers and/or nanotubes of various chemical composition. Here, water-soluble nanotubes based on β-cyclodextrin (β-tubes) were used for entrapping of Fe nanoparticles obtained by the reduction of iron-containing precursors ([Fe3(CO)11H][Et4N] cluster and FeSO4). Using methods of light-scattering, viscometry, and isothermal diffusion measurements, it was shown that the adducts are associated in aqueous solutions. The presence of iron nanoparticles and the shape and size of adducts were verified by transmission electron microscopy. The adducts are long (up to 600 nm and longer), translucent associates consisting of denser walls and transparent cores. The width of nanotubes is ∼150 nm and the thickness of the wall 3–25 nm. Their magnetic properties were demonstrated by electron paramagnetic resonance method. The mechanism of self-assembly of the adducts is discussed.
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Acknowledgements
We are grateful to V. A. Kabanov for fruitful discussions, E. I. Ryumtsev for his interest in our study, G. Yu. Yurkov for the assistance with the TEM experiments, Yu. A. Koksharov for supplying the results of EPR study of materials and fruitful discussions, G. A. Tsirlina and V. M. Ivanov for their interest and helpful discussions, and F. A. Kalashnikov for the assistance in preparing the manuscript.
This work was supported by the Russian Foundation for Basic Research (project nos. 05-03-32083, 04-03-32090, and 04-03-32750), the International Science and Technology Center (project no. 1991), and the programs of the Presidium of the RAS “Fundamental Problems of Physics and Chemistry of Nanosized Systems and Nanomaterials” and “Directed Synthesis of Inorganic Substances with Specified Properties and Design of Functional Materials on Their Basis.”
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Topchieva, I.N., Spiridonov, V.V., Kataeva, N.A. et al. Magnetic nanocomposites based on cyclodextrin-containing molecular tubes and iron nanoparticles. Colloid Polym Sci 284, 795–801 (2006). https://doi.org/10.1007/s00396-005-1456-5
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DOI: https://doi.org/10.1007/s00396-005-1456-5