Back to Search
Start Over
Coupling Agent Effect on Magnetic Properties of Functionalized Magnetite-Based Nanoparticles
- Source :
- Chemistry of Materials. 20:5869-5875
- Publication Year :
- 2008
- Publisher :
- American Chemical Society (ACS), 2008.
-
Abstract
- The effect of surface inorganic−organic interactions on magnetic and structural properties of iron oxide magnetic nanoparticles functionalized by lipophilic stilbene molecules has been investigated. The molecules have been grafted through either phosphonate or carboxylate coupling agents. Mossbauer spectra recorded at 300 and 77K suggest a global composition of Fe2.82O4 for the two types of functionalization. Complementary in-field Mossbauer and SQUID measurements have demonstrated that the nanoparticles consist in a magnetite core surrounded by an oxidized layer. The oxidized shell exhibits a spin canting in the carboxylate case leading to a decrease of the net magnetization of the oxide nanoparticle. No canting occurs in the phosphonate case, and the magnetic properties are therefore preserved. The magnetic properties thus depend on the coupling agent, e.g., surface interactions. This result is of primary importance to tune the magnetic properties of functionalized nanoparticles for biomedical and high ...
- Subjects :
- Materials science
General Chemical Engineering
Inorganic chemistry
Oxide
Nanoparticle
General Chemistry
equipment and supplies
Magnetization
chemistry.chemical_compound
chemistry
Chemical engineering
Materials Chemistry
Surface modification
Magnetic nanoparticles
Carboxylate
human activities
Magnetite
Spin canting
Subjects
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 20
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........ee662c148f3d57cb3c8a08e001c99cd5