INVESTIGADORES
ALVAREZ Vera Alejandra
congresos y reuniones científicas
Título:
Magnetic Properties of PVA Ferrogels obtained through a One-pot Freezing-Thawing Procedure
Autor/es:
VERA ALVAREZ; DIEGO MURACA; P. M. ZELIS; K. SHARMA; R. K. PIROTA; JIMENA GONZÁLEZ; CRISTINA HOPPE; FRANCISCO SANCHEZ
Reunión:
Conferencia; 20th Latin American Symposium on Solid State Physics; 2011
Resumen:
PVA ferrogels were obtained through a one-pot technique that involves coprecipitation
of iron salts in presence of a PVA solution, followed by freezingthawing
cycles of the resulting NPs dispersions. The protecting effect of PVA
enabled the synthesis of small magnetic nanoparticles (NPs) that did not agglomerate
in the initial solution allowing the synthesis of well-dispersed ferrogels
by physical crosslinking. Magnetic properties of PVA ferrogels were measured
over the temperature range of 5k to 300 K. Coercitive field as function
of temperatures were obtained from the magnetization loops in the mentioned
temperature range. Fied Cooling-Zero Field Cooling measurement protocol
was performed with applied field of 50 Oe. Ferrogels showed superparamagnetic
properties at room temperature and blocking temperature below 250
K.