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    Concentration and path-length dependence on the faraday rotation of magnetic fluids based on highly water-soluble fe3o4/paa nanoparticles synthesized by a high-temperature hydrolysis method
    (2013) Küçükdermenci S.; Kutluay D.; Çelik E.; Mermer O.; Avgyn Y.
    In this study, highly water-soluble Fe3O4/PAA (polyacrylic acid) nanoparticles (NPs) were synthesized by a high-temperature hydrolysis method. We report the first demonstration of the concentration and path-length dependence on the Faraday rotation (FR) for a magnetic fluid (MF) synthesized by this novel method. Experiments were performed in the DC regime (0-6 × 10-2 T) at room temperature. Measurements were carried out with 5-3.33 mg/ml and 1.18 mg/ml samples in cells (2, 5, 7 and 10) mm. The maximum rotation was recorded as 0.96° cm-1 for the 3.33 mg/ml concentration in the cell 10 mm. It was found that the magnetic fluid behaves with a distinctive phenomenon in different sized cells although its concentration was the same. The role of the different parameters on the FR was discussed via spatial limitations imposed by the cells and a premature saturation term. This work provides a new insight for FR investigations of MFs including highly water-soluble magnetic NPs.
  • Küçük Resim Yok
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    Synthesis of a Fe3O4/paa-based magnetic fluid for Faraday-rotation measurements
    (2013) Küçükdermenci S.; Kutluay D.; Avgyn Y.
    Highly water-soluble Fe3O4/PAA (polyacrylic acid) nanoparticles (NPs) were synthesized with the high-temperature hydrolysis method. We report the first demonstration of Faraday rotation (FR) for a magnetic fluid (MF) synthesized with this novel method. The experiments were performed in the DC regime (0-6. 10C-2 T) at room temperature for 14 concentrations from 1.8 mg/ml to 5 mg/ml. The maximum rotation was recorded as 0.96° cm-1 for 3.33 mg/ml and this is called the critical concentration (CCRITICAL). It was found that the rotation tends to decrease when the concentration is higher than CCRITICAL. The MF behavior for FR is discussed with respect to substructure interactions (particle-particle, chain-chain). This work provides a new insight for the FR investigations of MFs including highly water-soluble magnetic NPs.