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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Two-step synthesis and properties of amagnetic-field-sensitive modified maltodextrin-based hydrogel

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Autor(es):
Paulino, Alexandre T. [1] ; Fajardo, Andre R. [2] ; Junior, Andrea P. [3] ; Muniz, Edvani C. [2] ; Tambourgi, Elias B. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Sch Chem Engn, Dept Chem Syst Engn, Separat Proc Lab, BR-13083852 Campinas, SP - Brazil
[2] Univ Estadual Maringa, Dept Chem, Polymer Mat & Composite Lab, Maringa, Parana - Brazil
[3] Univ Estadual Maringa, Dept Phys, Maringa, Parana - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Polymer International; v. 60, n. 9, p. 1324-1333, SEP 2011.
Citações Web of Science: 17
Resumo

A magnetic-field-sensitive modified maltodextrin-based hydrogel (ferrogel) was synthesized. Fourier transform infrared and (13)C-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 (AU)

Processo FAPESP: 08/00285-7 - Síntese de hidrogéis magnéticos constituídos de polissacarídeos para a aplicação na remediação de águas e efluentes industriais
Beneficiário:Alexandre Tadeu Paulino
Linha de fomento: Bolsas no Brasil - Pós-Doutorado