Applied Physics Letters · 2002 · 115 citations · 10 references
Natural SciencesMaterials EngineeringMaterials ScienceMagnetic MaterialsNanomaterialsNanotechnologyFerrimagnetic MaterialsMagnetic CharacterizationMagnetic NanomaterialsMagnetic OxidesNanocompositesSelf-assembly Of NanomaterialsFerrimagnetic NanoparticlesMagnetic NanocompositesMagnetic NanoparticlesMagnetic PropertiesMixed Metal OxidesNanocomposite FilmsPolymer MatricesSuperconducting Quantum Interference Device Magnetometry
The development of self-assembled magnetic CoFe2O4 nanoparticles within polymer matrices at room temperature is reported. Diblock copolymers consisting of poly (norbornene) and poly (norbornene-dicarboxcylic acid) (NOR/NORCOOH) were synthesized. The self-assembly of the mixed metal oxide within the NORCOOH block was achieved at room temperature by processing the copolymer nanocomposite using wet chemical methods. Morphology and magnetic properties were determined by superconducting quantum interference device magnetometry, transmission electron microscopy, wide angle x-ray diffraction, and Fe57 Mössbauer spectroscopy. The CoFe2O4 nanoparticles are uniformly dispersed within the polymer matrix, and have an average radius of 4.8±1.4 nm. The nanocomposite films are superparamagnetic at room temperature and ferrimagnetic at 5 K.
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<i>Standard X-Ray Diffraction Powder Patterns</i>
Howard E Swanson, Eleanor Tatge, Ruth K. Fuyat · Physics Today · 1954 · 654 citations