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16 Mar 2009

Volume 94, Issue 11, Articles (11xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 94, 111101 (2009); http://dx.doi.org/10.1063/1.3097278 (3 pages)

Ling Lu, Adam Mock, Tian Yang, Min Hsiung Shih, Eui Hyun Hwang, Mahmood Bagheri, Andrew Stapleton, Stephen Farrell, John O’Brien, and P. Daniel Dapkus
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Light driven microflow in ice

Franz M. Weinert, Max Wühr, and Dieter Braun

Appl. Phys. Lett. 94, 113901 (2009); http://dx.doi.org/10.1063/1.3097206 (3 pages) | Cited 7 times

Online Publication Date: 16 March 2009

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We optically pump water through micrometer thin ice sheets. The ice is locally moved with speeds exceeding 5 cm/s by repetitive melting and freezing, which occurs around a moving infrared laser spot. The minimal channel width is 10 μm. The diffusion limitation of ice allows for fast spatial biomolecule control without predefined channels, valves, or external pumps. Dye molecules are pumped across an ice-ice interface, showing the possibility of microfluidic applications. Pumping in ice is three orders of magnitude faster than the previously shown for thermoviscous pumping in water.
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61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
64.70.dj Melting of specific substances
64.70.D- Solid-liquid transitions
47.85.Np Fluidics
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