Ferrofluids are superparamagnetic suspensions of nanoparticles that can be used as transducers in microfluidic systems, among others. In corresponding setups a microscopic enclosure such as a microchannel is filled with a ferrofluid that is acted on by an external magnetic field. The induced motion of the ferrofluid is utilized to pump or manipulate minute amounts of liquids. Here the dynamic behavior of an adaptive liquid microlens driven by a ferrofluidic transducer is studied. Adaptive microlenses based on that principle promise a number of advantages over existing concepts, such as an increased tuning range of the focal length. It is shown that the delay time of the deformation of the lens surface to the displacement of the magnet producing the external field increases with increasing magnet speed. Dynamic leakage of the lens liquid around the ferrofluid plug, on the other hand, only occurs when the magnet speed exceeds a threshold value and further increases from that point onwards. When the viscosity of the lens liquid increases, both the delay time and the dynamic leakage increase.
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ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5450-1
PROCEEDINGS PAPER
The Dynamic Behavior of an Adaptive Liquid Microlens Driven by a Ferrofluidic Transducer Available to Purchase
Wenjia Xiao,
Wenjia Xiao
Technische Universita¨t Darmstadt, Darmstadt, Germany
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Steffen Hardt
Steffen Hardt
Technische Universita¨t Darmstadt, Darmstadt, Germany
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Wenjia Xiao
Technische Universita¨t Darmstadt, Darmstadt, Germany
Steffen Hardt
Technische Universita¨t Darmstadt, Darmstadt, Germany
Paper No:
FEDSM-ICNMM2010-30353, pp. 1649-1655; 7 pages
Published Online:
March 1, 2011
Citation
Xiao, W, & Hardt, S. "The Dynamic Behavior of an Adaptive Liquid Microlens Driven by a Ferrofluidic Transducer." Proceedings of the ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B. Montreal, Quebec, Canada. August 1–5, 2010. pp. 1649-1655. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30353
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