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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. |
Access: | L |
Appears in Collections: | Artigo de periódico |
Files in This Item:
File | Description | Size | Format | |
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Art-08_Waldemar_AAMacedo.pdf | 354.12 kB | Adobe PDF | View/Open |
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