Flow profiling of a surface-acoustic-wave nanopump -: art. no. 056311

被引:83
作者
Guttenberg, Z
Rathgeber, A
Keller, S
Rädler, JO
Wixforth, A
Kostur, M
Schindler, M
Talkner, P
机构
[1] Advalytix AG, D-85649 Brunnthal, Germany
[2] Univ Munich, D-80539 Munich, Germany
[3] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany
关键词
D O I
10.1103/PhysRevE.70.056311
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The flow profile in a capillary gap and the pumping efficiency of an acoustic micropump employing surface acoustic waves is investigated both experimentally and theoretically. Ultrasonic surface waves on a piezoelectric substrate strongly couple to a thin liquid layer and generate a quadrupolar streaming pattern within the fluid. We use fluorescence correlation spectroscopy and fluorescence microscopy as complementary tools to investigate the resulting flow profile. The velocity was found to depend on the applied power approximately linearly and to decrease with the inverse third power of the distance from the ultrasound generator on the chip. The found properties reveal acoustic streaming as a promising tool for the controlled agitation during microarray hybridization.
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页数:10
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