Magnetite and magnetite/silver core/shell nanoparticles with diluted magnet-like behavior
| Autor: | Virgilio Angel González González, Ubaldo Ortiz, M. A. Garza-Navarro, Elder De la Rosa, Alejandro Torres-Castro |
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| Rok vydání: | 2010 |
| Předmět: |
Nanostructure
Precipitation (chemistry) Nanoparticle Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound Magnetization Nuclear magnetic resonance chemistry Chemical engineering Ferromagnetism Transmission electron microscopy Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry High-resolution transmission electron microscopy Magnetite |
| Zdroj: | Journal of Solid State Chemistry. 183:99-104 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2009.10.019 |
| Popis: | In the present work is reported the use of the biopolymer chitosan as template for the preparation of magnetite and magnetite/silver core/shell nanoparticles systems, following a two step procedure of magnetite nanoparticles in situ precipitation and subsequent silver ions reduction. The crystalline and morphological characteristics of both magnetite and magnetite/silver core/shell nanoparticles systems were analyzed by high resolution transmission electron microscopy (HRTEM) and nanobeam diffraction patterns (NBD). The results of these studies corroborate the core/shell morphology and the crystalline structure of the magnetite core and the silver shell. Moreover, magnetization temperature dependent, M(T), measurements show an unusual diluted magnetic behavior attributed to the dilution of the magnetic ordering in the magnetite and magnetite/silver core/shell nanoparticles systems. |
| Databáze: | OpenAIRE |
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