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Related Experiment Videos

Method of determining nanoparticle core weight.

Fred Reynolds1, Terry O'loughlin, Ralph Weissleder

  • 1Center for Molecular Imaging Research, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA.

Analytical Chemistry
|February 1, 2005
PubMed
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A new viscosity/light scattering method offers a faster, non-destructive alternative to transmission electron microscopy for determining nanoparticle core weight. This technique is applicable to various materials, including iron nanoparticles and proteins.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Polymer-coated nanoparticles are crucial in industry, research, and medicine.
  • Transmission electron microscopy (TEM) is standard for nanoparticle core characterization but is time-consuming and resource-intensive.
  • Accurate determination of nanoparticle core weight is essential for understanding their properties and applications.

Purpose of the Study:

  • To introduce and validate a novel, non-destructive method for determining nanoparticle core weight.
  • To provide an alternative to traditional methods like TEM.
  • To demonstrate the method's versatility across different materials.

Main Methods:

  • The viscosity/light scattering method utilizes viscosity measurements to determine partial specific volume.

Related Experiment Videos

  • Particle diameter is measured via light scattering to calculate individual particle volume.
  • Nanoparticle concentration (w/v) is combined with these parameters to ascertain core weight.

    • Main Results:

    • The viscosity/light scattering method successfully determined the core weights of iron-based nanoparticles (amino-CLIO, ferritin).
    • The method also accurately measured the molecular weights of globular proteins (IgG, albumin) and polystyrene microspheres.
    • Results demonstrate the method's effectiveness and broad applicability.

    Conclusions:

    • The viscosity/light scattering method provides a rapid, non-destructive, and versatile alternative for nanoparticle core weight determination.
    • This technique can be routinely applied to a wide range of materials.
    • It offers a practical solution for nanoparticle characterization, overcoming limitations of TEM.