HOME >> BIOLOGY >> NEWS
Shifting liquid crystals may serve as personal, portable chemical sensors, Science researchers report

Liquid crystals formed from molecules weakly tethered to a nanotextured surface could form the basis of highly sensitive, wearable sensors to detect personal exposure to certain synthetic organic chemicals, researchers report in the 17 August 2001 issue of the journal Science.

Such sensors could be used to detect environmental exposure to residential pesticides, monitor chemical markers of food spoilage, and could possibly serve some day as sensors for certain toxic nerve gases such as sarin, according to Science co-author Nicholas L. Abbott of the University of Wisconsin, Madison.

Techniques to detect such compounds already exist, but these methods (like mass spectrometry) are mostly confined to the laboratory--too bulky and complex to provide real-time, portable detection.

"These lab methods are extremely sensitive, but they're never going to be the basis for measuring personal exposure. We wanted to create something that could be worn like a badge, like those worn to detect radiation," says Abbott.

The sensor devised by Abbott and co-author Rahul R. Shah of the 3M Corporation (formerly of University of Wisconsin) consists of an ultrathin gold film with nanoscale corrugation. The surface of the gold film is then dotted with protruding chemical receptors that weakly anchor liquid crystal in a well-defined orientation along the film's surface.

When these receptors are exposed to the specific chemical that is the object of detection, however, they bond more strongly with that target chemical than they do with the liquid crystal. In effect, the target chemical muscles in on the liquid crystal's territory, shoving it away from the receptors. This displaces the liquid crystal into a new orientation that is controlled by the underlying surface texture, and the new orientation is visible to the naked eye as a change in the sensor's color or brightness.

On a surface with carboxylic acid receptors, for instance
'"/>

Contact: Ginger Pinholster
gpinhols@aaas.org
202-326-6421
American Association for the Advancement of Science
16-Aug-2001


Page: 1 2

Related biology news :

1. Favorite liquid revisited
2. Diabetes therapies and liquid memory may develop from micro fluid research, Science researchers say
3. Hope for nano-scale delivery of medicine using a light beam to move liquid through tiny tubes
4. Penn engineers develop fuel cell that uses liquid diesel, the first such device to run on a widely available fuel
5. Zooming liquid particles show technological promise
6. Researchers develop liquid form of DNA
7. Microbes trick provides a template for willowy crystals
8. With toxic crystals, bacterium targets - and takes out nematodes
9. Patented process preserves transplant tissues/organs
10. Pocket gophers serve as ecosystem engineers
11. UAB creates the first Internet server to search for genetic diversity

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/3/2016)... , February 4, 2016 --> ... SEK 1,351.5 M (105.0), up 1,187% compared with fourth quarter of 2014. ... to SEK 517.6 M (loss: 30.0). Earnings per share increased ... was SEK 537.4 M (neg: 74.7). , ... Revenues amounted to SEK 2,900.5 M (233.6), up 1,142% compared with 2014. ...
(Date:2/2/2016)... NEW YORK , Feb. 2, 2016 /PRNewswire/ ... analysis of the bioinformatic market by reviewing the ... computer enabled tools that drive the field forward. ... report to: Identify the challenges and opportunities ... service providers and software solution developers, as well ...
(Date:2/1/2016)... -- Rising sales of consumer electronics coupled ... gesture control market size through ... electronics coupled with new technological advancements to drive global ... through 2020   --> Rising ... to drive global touchfree intuitive gesture control market ...
Breaking Biology News(10 mins):
(Date:2/10/2016)... -- IsoRay, Inc. (NYSE MKT: ISR), a medical technology company ... for the treatment of prostate, brain, lung, head and ... for the second quarter and six months of fiscal ... --> --> Revenue was $1.19 ... ended December 31, 2015, a 12% increase compared to ...
(Date:2/10/2016)... , ... February 10, 2016 , ... LATHAM, NEW YORK... ... the SPIE Photonics West conference in San Francisco’s Moscone Center from February ... the same venue. , These latest InGaAs PIN diode standard packages feature a ...
(Date:2/10/2016)... ... February 10, 2016 , ... Cenna Bioscience Inc., an emerging biopharmaceutical ... Alzheimer’s disease, announced today it has been selected to present at the Cavendish Global ... Palm Beach, Florida. The purpose of the Forum is to help family offices ...
(Date:2/9/2016)... CA (PRWEB) , ... February 08, 2016 , ... ... and multilingual testing services, announced today the launch of its revamped and improved ... of scalable language service solutions, the redesigned website will better communicate how the ...
Breaking Biology Technology:
Cached News: