Investigating the Effective Hydrodynamic Size of Dextran Coated Iron Oxide Nanoparticles

POSTER

Abstract

We report synthesis and functionalization of magnetite nanoparticles by coating with dextran having 5, 15-20, 60-90, and 670 kDa molecular weights. The hydrodynamic radii of the functionalized nanoparticles suspended in water measured by dynamic light scattering technique assuming the bulk value for viscosity, were 91, 100, 106, and 132 nm, respectively. By measuring the ac magnetic loss, we determined the effective sizes to be 105, 113, 122, and 136 nm, respectively. The sizes measured by these techniques are approximately twice as large as expected given the iron oxide nanoparticle size and surfactant molecular chain length, at least for the lower molecular weight dextran. Comparing the results of hydrodynamic sizes studies, we conclude that the effective viscosity for the coated nanoparticles may be different than the bulk viscosity of the carrier liquid.

*V. Gumber acknowledges support from NSF-REU grant No. EEC-0552772.

Authors

  • Prem Vaishnava

    • Kettering University
    • Kettering University, Flint, MI

  • Vikas Gumber

    • Wayne State University, Detroit, MI

  • Rajesh Regmi

    • Wayne State University, Detroit, MI

  • Correy Black

    • Wayne State University, Detroit, MI

  • Ambesh Dixit

    • Wayne State University, Detroit, MI

  • Vaman Naik

    • University of Michigan, Dearborn
    • University of Michigan-Dearborn, Dearborn, MI 48128
    • Department of Natural Sciences, University of Michigan-Dearborn
    • Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI

  • Sudakar Chandran

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

  • Ratna Naik

    • Wayne State University
    • Wayne State University, Detroit, MI
    • Department of physics and astronomy, Wayne State University

  • Gavin Lawes

    • Wayne State University
    • Wayne State University, Detroit, MI
    • Department of physics and astronomy, Wayne State University