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Issue 29, 2014
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Trapping of single nano-objects in dynamic temperature fields

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In this article we explore the dynamics of a Brownian particle in a feedback-free dynamic thermophoretic trap. The trap contains a focused laser beam heating a circular gold structure locally and creating a repulsive thermal potential for a Brownian particle. In order to confine a particle the heating beam is steered along the circumference of the gold structure leading to a non-trivial motion of the particle. We theoretically find a stability condition by switching to a rotating frame, where the laser beam is at rest. Particle trajectories and stable points are calculated as a function of the laser rotation frequency and are experimentally confirmed. Additionally, the effect of Brownian motion is considered. The present study complements the dynamic thermophoretic trapping with a theoretical basis and will enhance the applicability in micro- and nanofluidic devices.

Graphical abstract: Trapping of single nano-objects in dynamic temperature fields

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Article information

10 Apr 2014
09 Jun 2014
First published
09 Jun 2014

Phys. Chem. Chem. Phys., 2014,16, 15207-15213
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Trapping of single nano-objects in dynamic temperature fields

M. Braun, A. Würger and F. Cichos, Phys. Chem. Chem. Phys., 2014, 16, 15207
DOI: 10.1039/C4CP01560F

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