Magneto-sensitive hybrid nanocomposites of water-soluble sodium alginate cross-linked with calcium ions and maghemite
| Autor: | Andrey V. Sybachin, V. V. Spiridonov, I. G. Panova, S. B. Zezin, L.A. Makarova, Alexander A. Yaroslavov, V. V. Kuznetsov, Alla A. Novakova, T. G. Baluyan |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
magnetic nanoparticles
Materials science Polymers and Plastics General Chemical Engineering Maghemite chemistry.chemical_element 02 engineering and technology engineering.material Calcium 010402 general chemistry lcsh:Chemical technology 01 natural sciences Ion nanocomposites Materials Chemistry lcsh:TA401-492 lcsh:TP1-1185 Physical and Theoretical Chemistry Magneto Sodium alginate Polymer composites Nanocomposite Organic Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences maghemite Water soluble Chemical engineering chemistry biodegradable polymers engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | eXPRESS Polymer Letters, Vol 12, Iss 5, Pp 452-461 (2018) |
| Popis: | A synthetic procedure is described for preparation of magneto-sensitive nanocomposites from maghemite nanoparticles and a natural polysaccharide, sodium alginate cross-linked with calcium ions. With this procedure, a series of nanocomposites was synthesized and characterized by spectrophotometry, transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, Fourier transform IR-spectroscopy and magnetometry with the following main conclusions: (a) The nanocomposites retain their solubility in water unless the iron content exceeds 18.1±0.2 wt%. (b) Only γ-Fe2O3 nanoparticles are included in the nanocomposite. (c) Size of nanoparticles lies within a 4–20 nm range with a dominant diameter of 7±1 nm. (d) Maghemite nanoparticles bind to the alginate matrix via formation of electrostatic and coordination contacts between the surface Fe3+ maghemite ions and functional alginate groups. (e) The nanocomposites exhibit properties which are characteristic for soft magnetic materials since they have a low coercive force. (f) Magnetic characteristics of the nanocomposites, saturation magnetization and residual magnetization, are effectively controlled by the maghemite content. (g) An external magnetic field causes the nanocomposites to move in an aqueous dispersion. |
| Databáze: | OpenAIRE |
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