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Updated: Apr 28, 2026

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Trapping of single nano-objects in dynamic temperature fields.

Marco Braun1, Alois Würger, Frank Cichos

  • 1Molecular Nanophotonics Group, Institute of Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany. cichos@physik.uni-leipzig.de.

Physical Chemistry Chemical Physics : PCCP
|June 19, 2014
PubMed
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Researchers studied a Brownian particle in a dynamic thermophoretic trap. They found a stability condition for particle confinement using a steered laser beam, confirmed experimentally for microfluidic applications.

Area of Science:

  • Physics
  • Physical Chemistry
  • Nanotechnology

Background:

  • Thermophoretic traps utilize temperature gradients to manipulate particles.
  • Dynamic traps offer enhanced control over particle behavior.
  • Brownian motion introduces inherent randomness in particle dynamics.

Purpose of the Study:

  • To investigate the dynamics of a Brownian particle within a feedback-free dynamic thermophoretic trap.
  • To establish a theoretical basis for dynamic thermophoretic trapping.
  • To enhance the applicability of thermophoretic traps in micro- and nanofluidic devices.

Main Methods:

  • A focused laser beam heats a circular gold structure, creating a repulsive thermal potential.
  • The laser beam is steered along the circumference to confine the Brownian particle.

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Related Experiment Videos

Last Updated: Apr 28, 2026

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
07:20

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

6.3K
Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

27.3K
A Microfluidic-based Hydrodynamic Trap for Single Particles
10:13

A Microfluidic-based Hydrodynamic Trap for Single Particles

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  • Theoretical analysis involves switching to a rotating frame to simplify the dynamics.
  • Particle trajectories and stability points are calculated and experimentally verified.

    • Main Results:

    • A stability condition for particle confinement was theoretically derived.
    • Particle trajectories and stable points were calculated as a function of laser rotation frequency.
    • Experimental results confirmed the theoretical predictions.
    • The influence of Brownian motion on particle confinement was considered.

    Conclusions:

    • The study provides a theoretical foundation for dynamic thermophoretic trapping.
    • The findings demonstrate the feasibility of controlling Brownian particle motion using steered laser beams.
    • This research advances the potential applications of thermophoretic traps in micro- and nanofluidics.