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|Type:||Artigo de periódico|
|Title:||Two-step synthesis and properties of amagnetic-field-sensitive modified maltodextrin-based hydrogel|
|Abstract:||A magnetic-field-sensitive modified maltodextrin-based hydrogel (ferrogel) was synthesized. Fourier transform infrared and C-13-CP/MAS NMR spectral analyses confirmed the efficiency of the gelling process. X-ray diffraction analysis revealed the appearance of new crystalline planes in the hydrogel diffractograms after embedding of magnetite nanoparticles. Magnetization curves and Mossbauer analysis revealed that the magnetic hydrogel has a high lattice strain due to bonded iron atom covalence. Moreover, some magnetite molecules embedded in the hydrogel ensure a degree of paramagnetism and iron atoms exhibiting oxidation states alternating between 2 and 3 in the final material. Scanning electron microscopy and energy-dispersive X-ray analysis revealed that no phase separation occurred between the magnetite nanoparticles and crosslinked hydrogel, indicating excellent dispersion throughout the hydrogel. Moreover, the average pore sizes decreased on increasing the amount of magnetite inside the polymer network. The results of compression stress versus strain revealed that the elasticity of the magnetic hydrogel was increased on increasing the amount of magnetite nanoparticles. Finally, kinetic studies revealed that the diffusion mechanism of water in the hydrogel is driven by anomalous release with a tendency towards the occurrence of macromolecular relaxation. (C) 2011 Society of Chemical Industry|
|Citation:||Polymer International. Wiley-blackwell, v. 60, n. 9, n. 1324, n. 1333, 2011.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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