Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 29, Pages 15207-15213Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp01560f
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Funding
- European Union
- Free State of Saxony
- graduate school BuildMoNa
- Deutsche Forschungsgemeinschaft DFG [SFB TRR102]
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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.
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