期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 138, 期 1, 页码 374-382出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.02.031
关键词
SAW actuation; SAW echo; Digital microfluidics; Droplet handling; MALDI analysis
资金
- Ministere de l'Economie, des Finances et de I'Industrie
Droplet localization is of primary importance in (Surface Acoustic Wave) SAW-actuated droplet manipulation for the blind-control of digital microfluidics in lab-on-chips (LOC). This issue is addressed by reconsidering hereafter the implementation of our already published SAW echo method. Two echo signals are now recorded: one for the droplet at its initial known position and one for the droplet at its new unknown position after displacement. Subtracting the delays of the 2 echoes leads to an accurate determination of the unknown position provided that the droplet characteristics remain identical for the 2 considered positions. No detailed analysis of the SAW scattering by the droplet is required with this new protocol. For implementing this echo-localization method, we propose a specific LOC architecture along with software monitoring. suitable for biological applications and devoted here to protein analysis by MALDI mass spectrometry. (C) 2009 Elsevier B.V. All rights reserved.
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