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Extinction of polarized light in ferrofluids with different magnetic particle concentrations
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Journal of Magnetism and Magnetic Materials Vol. 324, No. 2, pp. 113-123
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The magnetic field intensity and nanoparticle concentration dependence of the polarized light extinction in a ferrofluid made of magnetite particles stabilized with technical grade oleic acid dispersed in transformer oil was experimentally investigated. The magnetically induced optical anisotropy, i.e. the dichroism divided by concentration, was found to decrease with increasing sample concentration from 2% to 8%. The magnetically induced change in the optical extinction of light polarized at 54.74 degrees with respect to the magnetic field direction was found to be positive for the less concentrated sample (2%) and negative for the samples with 4% and 8% magnetic nanoparticle concentrations, the more negative the higher the concentration and field intensity. Based on the theoretically proven fact [11] that the particle orientation mechanism has no effect on the extinction of light polarized at 54.74 degrees with respect to the field direction, we analyzed the experimental findings in the frames of the agglomeration and long-range pair correlations theories for the magnetically induced optical anisotropy in ferrofluids.
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| ISSN: 0304-8853 |
| DOI: 10.1016/j.jmmm.2011.07.028 |
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2012
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| Ferrofluid; Magnetic fluid; Particle agglomeration; Long-range pair correlation; Optical transmittance; Optical extinction; Dichroism |
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SOCOLIUC Vlad
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POPESCU Lorin Bogdan
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International Journal Article
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http://www.sciencedirect.com/science/article/pii/S0304885311004926
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Magnetometry Laboratory
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| Institution: |
ARFT
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