The Effects and Role of Polyvinylpyrrolidone on the Size and Phase Composition of Iron Oxide Nanoparticles Prepared by a Modified Sol-Gel Method

• DOI: 10.1155/2017/7939727
• Publication Date: 2017-05-17T17:02:38Z
• Authors: Marcela F. Silva; Luiz A. S. de Oli...; Mariani A. Ciciliati; Michele K. Lima; Flávio F. Ivashita; Daniela M. Fernan...; Ana Adelina W. He...; Edgardo A. G. Pineda
• Keywords: Polyvinylpyrrolidone; Maghemite; Iron oxide nanoparticles

Fe 2 O 3 nanoparticles (as maghemite and hematite mixtures) were prepared using adapted sol-gel method from a polyvinylpyrrolidone (PVP) aqueous solution in various 3+ : PVP monomer ratios. Analysis of X-ray diffraction was obtained to evaluate the crystalline state, average crystallite size, composition iron oxide phases. The morphology size evaluated by electronic transmission microscopy. Magnetic properties analyzed at low room temperatures. Optical characteristics UV-Vis photoacoustic spectroscopy Mössbauer spectrum order subtle changes nuclear environment atoms.