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:2/9/2015)... 9, 2015  Lintec of America recently announced an ... nanotube (CNT) macrostructures, including sheets, yarns and ribbons, developed ... Leveraging the vast industrial resources of the global ... , Lintec of America is forming the Nano-Science and ... , focusing on scaling up the manufacturing and commercialization ...
(Date:2/5/2015)... IRVINE, Calif. , Jan. 27, 2015 ... trusted provider of globally deployed, innovative test ... today announced the delivery of its ... Martin Space Systems Company (LMSSC). GENASYS is ... the demands of mission-critical applications that require ...
(Date:2/5/2015)... Calif. , Feb. 3, 2015 ... technology, demand from industries such as consumer electronics, ... market for surface mount technology (SMT) screen printers. ... to automatic control will push the adoption curve ... will remain steady as glue dispensers are indispensable ...
Breaking Biology News(10 mins):Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4Marvin Test Solutions' GENASYS Platform Advances Mission-Critical Aerospace Production Test 2Marvin Test Solutions' GENASYS Platform Advances Mission-Critical Aerospace Production Test 3Marvin Test Solutions' GENASYS Platform Advances Mission-Critical Aerospace Production Test 4End-user Demand Spurs Global SMT Screen Printers and Glue Dispensers Market 2End-user Demand Spurs Global SMT Screen Printers and Glue Dispensers Market 3
(Date:3/5/2015)... The next implants made from the ... mark (European) approval. The CE mark is necessary for ... and the European Union. Following the Class IIb approval ... implants supplied by the Turkey-based company Osimplant for the ... Cervical Expandable Bladed HA PEEK Cage line of spinal ...
(Date:3/4/2015)... , March 4, 2015 The UPMC ... its 2015 Fellows in the Emerging Leaders in Biosecurity ... future leaders in the field of biosecurity, UPMC has ... from a wide array of backgrounds, including biological science, ... sector. "With the vision and support ...
(Date:3/4/2015)... Research and Markets ( http://www.researchandmarkets.com/research/jspg2c/global_biologics ... "Global Biologics and Biosimilars Industry Report 2015" ... The Global Biologics and Biosimilars Industry Report 2015 ... current state of the biologics and biosimilars industry. ... of the industry including definitions, classifications, applications and ...
(Date:3/4/2015)... 2015 AcelRx Pharmaceuticals, Inc. (Nasdaq: ... on the development and commercialization of innovative therapies ... today announced that it will release fourth quarter ... on Monday, March 9th, 2015. AcelRx management will ... Eastern Time (1:30 p.m. Pacific Time) on March ...
Breaking Biology Technology:Invibio’s PEEK-OPTIMA® HA Enhanced Gains Momentum: New Implant Receives European Approval 2Invibio’s PEEK-OPTIMA® HA Enhanced Gains Momentum: New Implant Receives European Approval 3UPMC Center for Health Security Announces 2015 Emerging Leaders in Biosecurity 2UPMC Center for Health Security Announces 2015 Emerging Leaders in Biosecurity 3Global Biologics and Biosimilars Industry Report 2015-2020 2AcelRx Pharmaceuticals to Hold Annual 2014 Financial Results Conference Call and Webcast on Monday, March 9th, 2015 2AcelRx Pharmaceuticals to Hold Annual 2014 Financial Results Conference Call and Webcast on Monday, March 9th, 2015 3
Cached News: