Estudo da Utilização de Coacervatos de Polifosfato de Sódio na obtenção de Materiais com Nanoparticulas Metálicas e Magnéticas

Abstract

The preparation of nanoparticles of silver in sol of polyphosphate of sodium (solution and coacervate) is boarded considering excellent experimental parameters in the stage of metallic synthesis of nanoparticles of magnetic silver and nanoparticles of iron. For nanoparticles of silver the following experimental parameters had been evaluated: i) the effect of the concentration of the solution of poliphosphate of sodium in function of the silver concentration, II) more good molar reason agent reducer/silver with intention to optimize the best condition of attainment of nanoparticles, III) the effect of pH and IV) effect of the temperature in the behavior of nanoparticles. Additionally, the photoirradiation was tested the preparation of nanoparticles of silver for an alternative route that excuses the addition of reducing chemical agents. The preparation of nanoparticles magnetic followed the described procedure in the literature that is based on the co-precipitation. The following stage dealt with the attainment of coacervates with nanoparticles considering alterations in the traditional methodology of attainment of the coacervates for incorporation of nanoparticles. The influence of the type of cátion and anion in the structure of the salt that interacts with the polyphosphate chain was evaluated. For the both proposals it was possible to get metallic coacervates with nanoparticles of silver and magnetic coacervates with nanoparticles of iron. The size of metallic and magnetic particles in the coacervate was esteem through the refinement of the espectrum of X-Ray Diffraction with the aid of the equation of Schereer and showed to be agree with the presence of nanoparticles. For characterization of the systems vibrational, spectroscopic in the region of infrared was used, electronic spectroscopy, thermogravimetric methods, scanning eletronic microscopy, Mössbauer spectroscopy and analyses reological.