INVESTIGADORES
MARCOVICH norma Esther
congresos y reuniones científicas
Título:
Analysis of chitosan/magnetite based films obtained by different synthesis methods
Autor/es:
GIANINA A. KLOSTER; DIEGO MURACA; NORMA E. MARCOVICH; MIRNA A. MOSIEWICKI
Lugar:
Rio de Janeiro
Reunión:
Conferencia; Fifth international Conference on Natural Polymers and Biomaterials, ICNP 2017 Rio; 2017
Resumen:
In this work, two synthesis methods were used, being the nanocomposite films obtained by casting in both cases. The first approach is a simple one-step in situ nanoparticle chemical co-precipitation method, using iron salts and chitosan solutions as precursors. In the second one, particles are previously synthesized by the co-precipitation method [2], dried and then redispersed into the polymeric solution by ultrasonication. The films were characterized physical (SEM, TEM, contact angle, moisture sorption, total soluble mass), chemical (FTIR, X-Ray), thermal (TGA), mechanical (tensile tests) and magnetically (SQUID magnetometry). The film properties were related with the amount, the size and the agglomeration/dispersion of the magnetite nanoparticles in the polymeric matrix. While for the films where the magnetite was synthesized in situ the increase in the amount of particles generated important changes in the microstructure that affected all the other properties, in the films where the dispersion of the magnetite was obtained by ultrasonication the presence of agglomerates of iron oxide particles was observed and the dependence of the nanocomposite films properties with nanoparticle concentration were much less noticeable.