title: Flow profiling of a surface-acoustic-wave nanopump.
abstract: 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.
authors.affiliation: Advalytix AG, Eugen-Sänger-Ring 4, D-85649 Brunnthal, Germany.
authors.forename: Z
authors.initials: Z
authors.lastname: Guttenberg
authors.forename: A
authors.initials: A
authors.lastname: Rathgeber
authors.forename: S
authors.initials: S
authors.lastname: Keller
authors.forename: J O
authors.initials: JO
authors.lastname: Rädler
authors.forename: A
authors.initials: A
authors.lastname: Wixforth
authors.forename: M
authors.initials: M
authors.lastname: Kostur
authors.forename: M
authors.initials: M
authors.lastname: Schindler
authors.forename: P
authors.initials: P
authors.lastname: Talkner
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D004867:Equipment Design / Q000379:methods; D019544:Equipment Failure Analysis / Q000379:methods*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation* / Q000379:methods; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation* / Q000379:methods; D012212:Rheology / Q000295:instrumentation / Q000379:methods*; D014465:Ultrasonics