Document Detail

Microparticle collection and concentration via a miniature surface acoustic wave device.
MedLine Citation:
PMID:  17476381     Owner:  NLM     Status:  MEDLINE    
The ability to detect microbes, pollens and other microparticles is a critically important ability given the increasing risk of bioterrorism and emergence of antibiotic-resistant bacteria. The efficient collection of microparticles via a liquid water droplet moved by a surface acoustic wave (SAW) device is demonstrated in this study. A fluidic track patterned on the SAW device directs the water droplet's motion, and fluid streaming induced inside the droplet as it moves along is a key advantage over other particle collection approaches, because it enhances microparticle collection and concentration. Test particles consisted of 2, 10, 12 and 45 microm diameter monodisperse polystyrene and melamine microparticles; pollen from the Populus deltoides, Kochia scoparia, Secale cerale, and Broussonetia papyrifera (Paper Mulberry) species; and Escherichia coli bacteria. The collection efficiency for the synthetic particles ranged from 16 to 55%, depending on the particle size and surface tension of the collection fluid. The method was more effective in collecting pollen and the bacteria with an efficiency of 45-68% and 61.0-69.8%, respectively. Pollen collection was strongly influenced by its diameter, size, and surface geometry in a manner contrary to initial expectations. Reasons for the consistent yet unexpected collection results include leaky SAW pressure boundary segregation and shear-induced concentration of larger particles, and the subtle effects of wetting interactions. These results demonstrate a new method for collecting microparticles requiring only about one second per run, and illustrate the inadequacy of using synthetic microparticles as a substitute for their biological counterparts in experiments studying particle collection and behavior.
Ming K Tan; James R Friend; Leslie Y Yeo
Publication Detail:
Type:  Journal Article     Date:  2007-04-18
Journal Detail:
Title:  Lab on a chip     Volume:  7     ISSN:  1473-0197     ISO Abbreviation:  Lab Chip     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-05-03     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101128948     Medline TA:  Lab Chip     Country:  England    
Other Details:
Languages:  eng     Pagination:  618-25     Citation Subset:  IM    
Micro/Nanophysics Research Laboratory, Monash University, Clayton, Victoria 3800, Australia.
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MeSH Terms
Microfluidic Analytical Techniques / instrumentation*,  methods*
Microscopy, Electron, Scanning
Particle Size
Pollen / ultrastructure
Surface Properties

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