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Field-dependent anisotropic microrheological and microstructural properties of dilute ferrofluids

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Abstract.

We have measured microrheological and microstructural properties of a superparamagnetic ferrofluid made of Mn0.75Zn0.25Fe2O4 (MZF) nanoparticles, using passive microrheology in a home-built inverted microscope. Thermal motion of a probe microsphere was measured for different values of an applied external magnetic field and analysed. The analysis shows anisotropy in magneto-viscous effect. Additional microrheological properties, such as storage modulus and loss modulus and their transition are also seen. We have also obtained microstructural properties such as elongational flow coefficient \( \lambda_{2}^{}\) , relaxation time constant \( \tau\) , coefficient of dissipative magnetization \( \alpha\) , etc., using the analysis given in Oliver Muller et al., J. Phys.: Condens. Matter 18, S2623, (2006) and Stefan Mahle et al., Phys. Rev. E 77, 016305 (2008) over our measured viscosity data. Our values for the above parameters are in agreement with earlier theoretical calculations and macro-rheological experimental measurements. These theoretical calculations consider an ideal situation of zero-shear limit, which is best approximated only in the passive microrheology technique described here and a first time measurement of all these parameters with passive microrheology.

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Authors and Affiliations

  1. School of Physics, University of Hyderabad, 500046, Hyderabad, India

    Balaji Yendeti, G. Thirupathi, Ashok Vudaygiri & R. Singh

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  1. Balaji Yendeti
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  2. G. Thirupathi
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  3. Ashok Vudaygiri
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  4. R. Singh
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Correspondence to Ashok Vudaygiri.

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Yendeti, B., Thirupathi, G., Vudaygiri, A. et al. Field-dependent anisotropic microrheological and microstructural properties of dilute ferrofluids. Eur. Phys. J. E 37, 70 (2014). https://doi.org/10.1140/epje/i2014-14070-9

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  • DOI: https://doi.org/10.1140/epje/i2014-14070-9

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