Influence of iron oxide nanoparticles on the rheological properties of hybrid chitosan ferrogels
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| Autoři: | , , , , , |
|---|---|
| Médium: | artículo |
| Datum vydání: | 2009 |
| Popis: | Magnetite nanoparticles have been successfully synthesized in the presence of chitosan using an in situ coprecipitation method in alkali media. This method allows obtaining chitosan ferrogels due to the simul taneous gelation of chitosan. The chitosan concentration has been varied and its effects on the particle synthesis investigated. It has been demonstrated that high chitosan concentrations prevents the forma tion of magnetite due to the slow diffusion of the alkali species through the viscous medium provided by chitosan, instead iron hydroxides are formed. The presence of magnetite nanoparticles increases the elas tic modulus which results in a reinforcement of the chitosan ferrogels. This effect is counterbalanced by the disruption of hydrogen bonding responsible for the formation of chitosan hydrogels in alkali media. 2009 Elsevier Inc. All rights reserved. |
| Země: | Repositorio UNA |
| Instituce: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| Jazyk: | Inglés |
| OAI Identifier: | oai:null:11056/23982 |
| On-line přístup: | http://hdl.handle.net/11056/23982 http://dx.doi.org/10.1016/j.jcis.2009.07.066 |
| Klíčové slovo: | NANOPARTÍCULAS QUITOSANO HIERRO GELES NANOPARTICLES IRON CHITOSAN |