Adjustable, rapidly switching microfluidic gradient generation using focused travelling surface acoustic waves

We demonstrate a simple device to generate chemical concentration gradients in a microfluidic channel using focused travelling surface acoustic waves (F-TSAW). A pair of curved interdigitated metal electrodes deposited on the surface of a piezoelectric (LiNbO3) substrate disseminate high frequency s...

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Bibliographic Details
Published in:Applied physics letters 2014-01, Vol.104 (2), p.23506
Main Authors: Destgeer, Ghulam, Im, Sunghyuk, Hang Ha, Byung, Ho Jung, Jin, Ahmad Ansari, Mubashshir, Jin Sung, Hyung
Format: Article
Language:English
Subjects:
ABUNDANCE
Acoustic streaming
ALTERNATING CURRENT
Applied physics
Concentration gradient
Current sources
LITHIUM COMPOUNDS
Lithium niobates
MATERIALS SCIENCE
NIOBATES
NIOBIUM OXIDES
Organic chemistry
PIEZOELECTRICITY
SOUND WAVES
Subcritical flow
SUBSTRATES
Surface acoustic waves
SURFACES
Switching
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Summary:We demonstrate a simple device to generate chemical concentration gradients in a microfluidic channel using focused travelling surface acoustic waves (F-TSAW). A pair of curved interdigitated metal electrodes deposited on the surface of a piezoelectric (LiNbO3) substrate disseminate high frequency sound waves when actuated by an alternating current source. The F-TSAW produces chaotic acoustic streaming flow upon its interaction with the fluid inside a microfluidic channel, which mixes confluent streams of chemicals in a controlled fashion for an adjustable and rapidly switching gradient generation.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4862322