Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 5, 2007
Previous Article Next Article

Microparticle collection and concentration via a miniature surface acoustic wave device

Author affiliations

Abstract

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 μm 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.

Graphical abstract: Microparticle collection and concentration via a miniature surface acoustic wave device

Back to tab navigation

Article information


Submitted
11 Dec 2006
Accepted
20 Mar 2007
First published
18 Apr 2007

Lab Chip, 2007,7, 618-625
Article type
Paper

Microparticle collection and concentration via a miniature surface acoustic wave device

M. K. Tan, J. R. Friend and L. Y. Yeo, Lab Chip, 2007, 7, 618
DOI: 10.1039/B618044B

Social activity

Search articles by author

Spotlight

Advertisements