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Proceedings Paper

Trapping and micromanipulation using ultrasonic fields and dual ultrasonic/magnetic forces
Author(s): Martyn Hill; Peter Glynne-Jones; Nicholas R. Harris; Rosemary J. Boltryk; Christopher Stanley; Damian Bond
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Paper Abstract

Ultrasonic fields can be used to trap and manipulate micron-scale particles and second-phase fluids, utilising energy densities that do not impair cell viability. The technology can be seen as complementary to optical trapping as the size of the potential wells generated can be relatively large, making ultrasound suitable for the formation and manipulation of cell agglomerates, but less suitable for the manipulation of individual cells. This paper discusses physical phenomena associated with ultrasonic manipulation, including radiation forces, cavitation, and acoustic streaming. The technology is well suited to integration within "Lab on a Chip" devices and can involve excitation by plane, focussed, flexural, or surface acoustic waves. Example applications of resonators are discussed including particle filtration and concentration, cell washing, and biosensor enhancement. A recently developed device that uses both ultrasonic and magnetic forces to enhance the detection of tuberculosis bacteria using magnetic beads is discussed in detail. This approach uses ultrasonic levitation forces to overcome some of the issues associated with purely magnetic trapping. The technology has been implemented in a device in which the main fluidic components are disposable to allow for low production costs and improved control of biohazards.

Paper Details

Date Published: 27 August 2010
PDF: 10 pages
Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 77621G (27 August 2010); doi: 10.1117/12.863548
Show Author Affiliations
Martyn Hill, Univ. of Southampton (United Kingdom)
Peter Glynne-Jones, Univ. of Southampton (United Kingdom)
Nicholas R. Harris, Univ. of Southampton (United Kingdom)
Rosemary J. Boltryk, Univ. of Southampton (United Kingdom)
Christopher Stanley, ProKyma Technologies Ltd. (United Kingdom)
Damian Bond, ProKyma Technologies Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 7762:
Optical Trapping and Optical Micromanipulation VII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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