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artículos
Título:
Synthesis and characterization of PVA ferrogels obtained through a one-pot freezing-thawing procedure
Autor/es:
J. S. GONZALEZ; C. E. HOPPE; D. MURACA; F. H. SÁNCHEZ; V. A. ALVAREZ
Revista:
COLLOID AND POLYMER SCIENCE
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2011 vol. 289 p. 1839 - 1846
ISSN:
0303-402X
Resumen:
Polyvinyl alcohol (PVA) ferrogels were easily
obtained through a one-pot technique that involves coprecipitation
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 crosslinking.
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 crosslinking
agents make them ideal candidates for their use in
biomedical applications (artificial muscles, drug delivery,
and sensors among others).