31 March 2009 Transport powder and liquid samples by surface acoustic waves
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Abstract
Sample transport is an important requirement for In-situ analysis of samples in NASA planetary exploration missions. Tests have shown that powders or liquid drops on a surface can be transported by surface acoustic waves (SAW) that are generated on the surface using interdigital transducers. The phenomena were investigated experimentally and to generate SAWs interdigital electrodes were deposited on wafers of 128° rotated Y-cut LiNbO3. Transporting capability of the SAW device was tested using particles of various sizes and drops of various viscosities liquids. Because of different interaction mechanisms with the SAWs, the powders and the liquid drops were observed to move in opposite directions. In the preliminary tests, a speed of 180 mm/s was achieved for powder transportation. The detailed experimental setup and results are presented in this paper. The transporting mechanism can potentially be applied to miniaturize sample analysis system or "lab-on-chip" devices.
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Xiaoqi Bao, Yoseph Bar-Cohen, Stewart Sherrit, Mircea Badescu, Sahar Louyeh, "Transport powder and liquid samples by surface acoustic waves", Proc. SPIE 7291, Nanosensors, Biosensors, and Info-Tech Sensors and Systems 2009, 72910M (31 March 2009); doi: 10.1117/12.815387; https://doi.org/10.1117/12.815387
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