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Publication Detail
Radiation-driven rotational motion of nanoparticles.
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Liang M, Harder R, Robinson I
  • Publication date:
  • Pagination:
    757, 762
  • Journal:
    Journal of synchrotron radiation
  • Volume:
  • Issue:
    Pt 3
  • Medium:
  • Status:
  • Print ISSN:
  • Language:
  • Addresses:
    Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, MS103, Menlo Park, CA 94025, USA.
Focused synchrotron beams can influence a studied sample via heating, or radiation pressure effects due to intensity gradients. The high angular sensitivity of rotational X-ray tracking of crystalline particles via their Bragg reflections can detect extremely small forces such as those caused by field gradients. By tracking the rotational motion of single-crystal nanoparticles embedded in a viscous or viscoelastic medium, the effects of heating in a uniform gradient beam and radiation pressure in a Gaussian profile beam were observed. Changes in viscosity due to X-ray heating were measured for 42 µm crystals in glycerol, and angular velocities of 10-6 rad s-1 due to torques of 10-24 N m were measured for 340 nm crystals in a colloidal gel matrix. These results show the ability to quantify small forces using rotation motion of tracer particles.
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