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:
(Date:10/30/2014)... 30, 2014—Oligonucleotide-based therapeutics present unique challenges when it ... and developmental harm. New consensus guidelines for toxicity ... and biological characteristics of these novel biopharmaceuticals are ... peer-reviewed journal from Mary Ann Liebert, Inc. ... the Nucleic Acid Therapeutics website until ...
(Date:10/30/2014)... researchers have developed a suite of technologies that can ... which has applications in everything from search and rescue ... developed a platform for computer-mediated communication between humans and ... interpreting dogs, behavioral signals and sending them clear and ... assistant professor of computer science at NC State and ...
(Date:10/30/2014)...  Securus Technologies, a leading provider of ... public safety, investigation, corrections and monitoring, announced ... to its THREADS™ product, which utilizes sophisticated ... and focused leads for investigators. ... through identifying and delivering solutions serving the ...
Breaking Biology News(10 mins):New guidelines for reproductive & developmental toxicity testing of oligonucleotide drugs 2New tech aims to improve communication between dogs and humans 2Securus Technologies Adds Advanced Features to Its Industry-Leading Investigative Analytics Product 2
(Date:10/31/2014)... (PRWEB) October 31, 2014 Stronger ... healthcare, construction, finance and consumer electronics will help ... reason, industry research firm IBISWorld has added a ... its growing industry report collection. , The Biometrics ... for biometric technologies such as fingerprint, iris, retina ...
(Date:10/30/2014)... Calif. , Oct. 30, 2014  Ardelyx, ... biopharmaceutical company focused on cardio-renal, gastrointestinal and metabolic ... quarter 2014 financial results on Thursday, November 6, ... will host a live conference call and webcast ... results and provide a business update. ...
(Date:10/30/2014)... Rancho BioSciences , the scientific data ... public data source TCGA for several of ... is now available for other oncology groups. ... data sources for their Pharma, Government and academic clients ... that becomes more easily accessible. Rancho advises their ...
(Date:10/30/2014)... 2014 Grace Century portfolio project, Provia ... Chairman of the Board, to the National Stem Cell ... was made by the Ministry of Health on behalf of ... , More than a year after Bahamian Parliament passed ... Minister Perry Christie said the government has completed the accompanying ...
Breaking Biology Technology:Biometrics Scan Software in the US Industry Market Research Report Now Available from IBISWorld 2Biometrics Scan Software in the US Industry Market Research Report Now Available from IBISWorld 3Ardelyx to Report Third Quarter 2014 Financial Results on November 6, 2014 2Rancho BioSciences Manually Curated TCGA Data Sets Available 2Grace Century’s Stem Cell Biobank Project Announces Chairman’s Appointment to National Stem Cell Ethics Committee of The Bahamas 2Grace Century’s Stem Cell Biobank Project Announces Chairman’s Appointment to National Stem Cell Ethics Committee of The Bahamas 3
Cached News: