Synthesis and characterization of PVA ferrogels obtained through a one-pot freezing–thawing procedure View Full Text


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Article Info

DATE

2011-11

AUTHORS

Jimena S. Gonzalez, Cristina E. Hoppe, Diego Muraca, Francisco H. Sánchez, Vera A. Alvarez

ABSTRACT

Polyvinyl alcohol (PVA) ferrogels were easily obtained through a one-pot technique that involves co-precipitation of iron salts in the presence of a PVA solution, followed by freezing–thawing cycles of the resulting nanoparticles (NPs) dispersions. The protecting effect of PVA enabled the synthesis of small magnetic NPs that did not agglomerate in the initial solution allowing the synthesis of well-dispersed ferrogels by physical cross-linking. Physical properties of the physically cross-linked ferrogels, as swelling ability, melting temperature, and crystallinity, were barely affected by the presence of NPs, presenting similar or improved values when compared with chemically cross-linked systems. Ferrogels showed superparamagnetic properties at room temperature that combined with the absence of toxic residues arising from cross-linking agents make them ideal candidates for their use in biomedical applications (artificial muscles, drug delivery, and sensors among others). More... »

PAGES

1839-1846

References to SciGraph publications

  • 2008-07. Effective anisotropy field variation of magnetite nanoparticles with size reduction in THE EUROPEAN PHYSICAL JOURNAL B
  • 2003-08. Poly(vinyl alcohol) as versatile biomaterial for potential biomedical applications in JOURNAL OF MATERIALS SCIENCE: MATERIALS IN MEDICINE
  • 2000-10-20. Structure and Applications of Poly(vinyl alcohol) Hydrogels Produced by Conventional Crosslinking or by Freezing/Thawing Methods in BIOPOLYMERS · PVA HYDROGELS, ANIONIC POLYMERISATION NANOCOMPOSITES
  • 2009-07. Synthesis of water dispersible magnetite nanoparticles in the presence of hydrophilic polymers in POLYMER BULLETIN
  • 2007. Magnetic Field-Responsive Smart Polymer Composites in OLIGOMERS # POLYMER COMPOSITES # MOLECULAR IMPRINTING
  • 2009-01. Nanocomposite polymer hydrogels in COLLOID AND POLYMER SCIENCE
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    URI

    http://scigraph.springernature.com/pub.10.1007/s00396-011-2501-1

    DOI

    http://dx.doi.org/10.1007/s00396-011-2501-1

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