Effects of varying surfactant chain lengths on the magnetic, optical and hyperthermia properties of ferrofluids

ORAL

Abstract

We report studies of the structural, magnetic, magneto-thermal and magneto-optic properties of dextran, oleic acid, lauric acid and myristic acid surfacted Fe$_{3}$O$_{4}$ nanoparticles of hydrodynamic sizes ranging from 32 nm to 92 nm. All the samples showed saturation magnetization of $\sim $50 emu/g, significantly smaller than the bulk value for Fe$_{3}$O$_{4}$, together with superparamagnetic behavior. The ac magnetization measurements on the dextran coated nanoparticles showed frequency dependent blocking temperature, consistent with superparamgnetic blocking. The ferrofluid heating rates in a 250 Gauss, 100 kHz ac magnetic field varied with the chain lengths of the surfactants, with higher heating rates for longer chains. DC-magnetic-field-induced light scattering patterns produced by two orthogonal He-Ne laser beams passing through the ferrofluid sample revealed different optical signatures for different surfactants.

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Authors

  • Corneliu Rablau

    • Kettering University, Flint, MI

  • Prem Vaishnava

    • Kettering University, Flint, MI

  • Rajesh Regmi

    • Wayne State University, Detroit, MI

  • C. Sudakar

    • Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201
    • Wayne State University, Detroit, MI
    • Department of Physics and Astronomy, Wayne State University

  • Correy Black

    • Wayne State University, Detroit, MI

  • Gavin Lawes

    • Wayne State University
    • Wayne State University, Detroit, MI

  • Ratna Naik

    • Wayne State University, Detroit, MI

  • Melissa Lavoie

    • Yale University, New Haven, CT

  • David Kahn

    • Oakland University, Auburn Hills, MI