| Autor: |
Rodica Turcu, Alexandrina Nan, Izabell Craciunescu, Cristian Leostean, Sergiu Macavei, Alina Taculescu, Oana Marinica, Camelia Daia, Ladislau Vekas, Urs Häfeli, Wolfgang Schütt, Maciej Zborowski |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| DOI: |
10.1063/1.3530014 |
| Popis: |
We report a comparative study of hybrid nanostructures prepared by using water based magnetic nanofluids and polymers such as poly(N‐isopropylacrylamide) and pyrrole copolymer functionalized with glycyl‐leucine. Design of magnetic nanostructures could be achieved using different synthesis procedures that allow either coating or clustering the magnetic nanoparticles from magnetic fluid by the addition of polymer. Physical‐chemical characteristics of hybrid magnetic nanostructures were investigated by FTIR, TEM, DLS, rotational viscosimetry and magnetization measurements. Functionalized pyrrole copolymer coated magnetite nanoparticles with mean size around 9 nm have superparamagnetic behavior and saturation magnetization value of 65 emu/g_Fe3O4. Clusters of magnetite nanoparticles from the water based magnetic nanofluid were encapsulated into polymeric PNIPA spheres having diameters in the range 50–100 nm. The procedure applied allowed to achieve high magnetic loading of polymeric microspheres, having saturation magnetization value of 41 emu/g. Also, the stable suspension in water of thermoresponsive magnetic microgel, as well as the dried samples shows superparamagnetic behavior. It was evidenced that the thermally induced transition from the swollen to collapsed state of magnetic microgels occurs around 30° C. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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