NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Transport Powder and Liquid Samples by Surface Acoustic WavesSample 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 deg rotated Y-cut LiNbO?. 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.
Document ID
20150008434
Document Type
Conference Paper
External Source(s)
Authors
Bao, Xiaoqi (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bar-Cohen, Yoseph (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Sherrit, Stewart (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Badescu, Mircea (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Louyeh, Sahar (Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
May 19, 2015
Publication Date
March 8, 2009
Subject Category
Fluid Mechanics and Thermodynamics
Meeting Information
SPIE Conference on Smart Structures and Materials(San Diego, CA)
Distribution Limits
Public
Copyright
Other
Keywords
Sample handling
SAW device
MEMS
lab-on-chip