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Control of nanoparticles with arbitrary two-dimensional force fields.

Adam E Cohen1

  • 1Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA. acohen@post.harvard.edu

Physical Review Letters
|May 21, 2005
PubMed
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An anti-Brownian electrophoretic trap precisely controls nanoscale objects in solution. This technique generates custom 2D force fields, enabling detailed study of Brownian motion in various potentials.

Area of Science:

  • Physics, Nanotechnology, Biophysics

Background:

  • Studying nanoscale object dynamics requires precise control over forces.
  • Brownian motion is fundamental to understanding particle behavior in fluids.

Purpose of the Study:

  • To introduce a novel anti-Brownian electrophoretic trap for generating arbitrary 2D force fields.
  • To demonstrate the trap's capability in studying Brownian motion under controlled potentials.

Main Methods:

  • Coupling fluorescence microscopy with digital particle tracking and real-time feedback.
  • Generating position-dependent electrophoretic forces on single nanoparticles.
  • Implementing the trap to create harmonic, power-law, and double-well potentials.

Main Results:

  • The trap successfully creates user-defined 2D force fields for individual nanoparticles.

Related Experiment Videos

  • Forces can be modulated over nanometer distances and millisecond timescales.
  • The technique allows for non-conservative force fields, not necessarily gradients of a potential.

    • Conclusions:

    • The anti-Brownian electrophoretic trap offers unprecedented control over nanoscale object manipulation.
    • This method provides a powerful tool for investigating complex dynamics and interactions in soft matter and biological systems.