INVESTIGADORES
FERREIRA Maria Lujan
artículos
Título:
Novel and facile synthesis of magnetic composites by a modified co-precipitation method
Autor/es:
VERÓNICA LASSALLE; MARÍA LUJÁN FERREIRA
Revista:
MATERIALS CHEMISTRY AND PHYSICS
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 130 p. 624 - 634
ISSN:
0254-0584
Resumen:
A simple and effective method is proposed to synthesize chitosan/magnetite (CS/MAG) and cellulose/
magnetite (CEL/MAG) composites. Biopolymers were employed in bulk during the co-precipitation
of magnetite, avoiding the problems associated to the polymers solubility. FTIR and XRD analysis revealed
that the polymeric template was perfectly integrated to the crystalline structure of magnetite. Measurements
of zeta (Z) potential indicated that new materials present different charged surfaces depending
on the biopolymer. SEM/TEM and dynamic light scattering (DLS) results demonstrated that particulated
materials with average diameters lower than 1 micrometer were obtained. The magnetic properties of such
composites were qualitatively verified. The as-obtained hybrids composites were tested for proteins
adsorption using bovine serum albumin (BSA) and insulin (Ins) as models. It was found that CS/MAG was
a better protein adsorbent than CEL/MAG. One important drawback of CEL/MAG was the lack of stability
under the proteins adsorption conditions.