Structural and Magnetic Properties of Iron Oxide Nanoparticles in Shells of Hollow Microcapsules Designed for Biomedical Applications
The functional hollow biodegradable microcapsules modified with the maghemite γ-Fe<sub>2</sub>O<sub>3</sub> nanoparticles and the hollow spherical CoFe<sub>2</sub>O<sub>4</sub>/SiO<sub>2</sub> nanocomposites were synthesized. Mössbauer spec...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Croatian Chemical Society
2015-12-01
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| Series: | Croatica Chemica Acta |
| Online Access: | http://hrcak.srce.hr/file/223112 |
| Summary: | The functional hollow biodegradable microcapsules modified with the maghemite γ-Fe<sub>2</sub>O<sub>3</sub> nanoparticles and the hollow spherical CoFe<sub>2</sub>O<sub>4</sub>/SiO<sub>2</sub> nanocomposites were synthesized. Mössbauer spectroscopy data reveal that the main part maghemite nanoparticles have evident superparamagnetic behavior which is retained up to room temperature. This allows directing the microcapsules by an external magnetic field, which is very important for the problem of target drug delivery. On the other hand, the hollow spherical CoFe<sub>2</sub>O<sub>4</sub>/SiO<sub>2</sub> nanocomposites with the small size particles do not show superparamagnetic behavior, but transit from magnetic to paramagnetic state by jump-like magnetic transition of the first order. This effect is a specific property of the magnetic nanoparticles isolated by an inert material. The method of synthesis can be modified with various bioligands on the silane surface, and such materials can have great prospects for use in diagnostics and bio-separation. |
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| ISSN: | 0011-1643 1334-417X |