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Title: NiO nanoparticles dispersed in mesoporous silica glass
Title of periodic: Journal of Physical Chemistry C Washington
metadata.dc.title.subtitlejournal: Nanomaterials and Interfaces
Authors: Carneiro, Nathália M.
Nunes, Wallace C.
Borges, Rui P.
Godinho, Margarida
Fernandez-Outon, Luis E.
Macedo, Waldemar Augusto de Almeida
Mazali, Italo O.
Affiliation: Universidade Estadual de Campinas/UNICAMP, Campinas,SP, Brasil
Universidade Federal Fluminense/UFF, Niterói, RJ, Brasil
Universidade de Lisboa, Lisboa, Portugal
Universidade de Lisboa, Lisboa, Portugal
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Centro de Desenvolvimento da Tenologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Estadual de Campinas, Campinas, SP, Brasil
Issue Date: 2010
Keywords: Niobium oxides;nanostructures;silica;glass;magnetic properties
Abstract: We have studied the magnetic properties of NiO nanoparticles dispersed into mesoporous silica glass with three particle size distributions obtained using the bottom-up nanofabrication technique. The samples were characterized by XRD, Raman, and TEM and found to consist of monodispersed rock salt structure NiO nanoparticles. The magnetic results indicate that the particles can be considered as an antiferromagnetically ordered core with an uncompensated magnetic moment, and a magnetically disordered surface. The magnetization loops exhibit a loop shift with intriguing temperature dependence. Furthermore, an increase in the average blocking temperature is observed with increases in the number of impregnation-decomposition cycles. These results are discussed considering the influence of the magnetic interaction on the core-shell structure of the nanoparticles.
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