Magnetic Properties and Dielectrical Relaxation Dynamics in CoFe2O4@PU Nanocomposites
| Autor: | Moshe Gottlieb, Natalia Frickel, A. Greenbaum, Annette M. Schmidt |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Range (particle radiation) Materials science Nanocomposite Nanotechnology Polymer Dielectric Atmospheric temperature range Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy chemistry Electric field Relaxation (physics) Particle Physical and Theoretical Chemistry Composite material |
| Zdroj: | The Journal of Physical Chemistry C. 115:10946-10954 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Organic–inorganic nanocomposite materials combine the advantages of organic polymers and inorganic nanoparticles. Due to their high application potential, the investigation of these materials is of great interest. In this study we examine the dielectric response of CoFe2O4@PU nanocomposites subjected to an external electric field. Dielectric properties were investigated in a frequency range of 10–2 Hz to 1 MHz and over a temperature range of 213 to 333 K, while varying the content of ferromagnetic particles. The experimental results provide insight to the structure–property relationship of nanocomposites subjected to an alternating electric field. We discuss two relaxation processes (β- and α-processes) that show a dependence on the particle content. For the β-process we observe an Arrhenius-like behavior with temperature, and the related activation energies decrease with increasing particle content. Evidently, the particles' presence facilitates the β-process relaxation in the polymer matrix, resulting i... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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