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Acoustic tweezers capture tiny creatures with ultrasound
Date:6/29/2012

University Park, Pa. -- A device about the size of a dime can manipulate living materials such as blood cells and entire small organisms, using sound waves, according to a team of bioengineers and biochemists from Penn State.

The device, called acoustic tweezers, is the first technology capable of touchlessly trapping and manipulating Caenorhabditis elegans (C. elegans), a one millimeter long roundworm that is an important model system for studying diseases and development in humans. Acoustic tweezers are also capable of precisely manipulating cellular-scale objects that are essential to many areas of fundamental biomedical research.

Acoustic tweezers use ultrasound, the same noninvasive technology doctors use to capture images of the fetus in the womb. The device is based on piezoelectric material that moves when under an electrical current. The vibrations pass through transducers attached to the piezoelectric substrate, where they are converted into standing surface acoustic waves (SAWs). The SAWs create pressure fields in the liquid medium that hold the specimen. The simple electronics in the device can tune the SAWs to precisely and noninvasively hold and move the specimen or inorganic object.

"We believe the device can be easily manufactured at a cost far lower than say, optical tweezers, which use lasers to manipulate single particles," said Tony Jun Huang, associate professor of bioengineering, whose group pioneered acoustic tweezers. "Optical tweezers require power densities 10,000,000 times greater than our acoustic tweezers, and the lasers can heat up and damage the cells, unlike ultrasound."

For many biological systems, acoustic tweezers will provide an excellent tool to mimic the conditions inside the body where cells are subject to waves of pressure and pulses of chemicals. The researchers published their results in this week's online edition of the Proceedings of the National Academy of Sciences
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Contact: Walt Mills
wem12@psu.edu
814-865-0285
Penn State
Source:Eurekalert  

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