Paper
14 March 2005 Microrheology using dual-beam optical tweezers and ultrasensitive force measurements
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Abstract
We investigate the dynamics of microscopic flow vortices. We create flow vortices by rotation of birefringent particles in optical tweezers. We then use either highly sensitive drag force measurements or video tracking to map the fluid velocity around that particle. The results obtained from these different methods are compared. Velocity profiles obtained for water agree very well with theoretical predictions. In contrast, we find a strong deviation of velocity profiles in a complex fluid from those predicted by simple theory.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gregor G. Knoener, Simon John Wyatt Parkin, Norman R. Heckenberg, and Halina Rubinsztein-Dunlop "Microrheology using dual-beam optical tweezers and ultrasensitive force measurements", Proc. SPIE 5736, Nanomanipulation with Light, (14 March 2005); https://doi.org/10.1117/12.591183
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CITATIONS
Cited by 3 scholarly publications.
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KEYWORDS
Particles

Microfluidics

Velocity measurements

Optical tweezers

Beam splitters

Polarization

Data modeling

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