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:6/25/2015)... June 25, 2015 According ... Type (Swipe & Area), Technology, Material (Optical Prism, ... Commercial Security & Others) & Geography - Global ... the said market is expected to reach $14,500.07 ... Browse 76 market Tables and ...
(Date:6/25/2015)... , June 25, 2015  TAKE Solutions Ltd., a ... by the United States Patent and Trademark Office (USPTO) ... process leverages TAKE Solutions, Clinical Accelerators to reduce the ... (when compared to standardization without the accelerators), thus reducing ... At the heart of the patented ...
(Date:6/24/2015)... June 24, 2015 This report provides market ... next six years. It contains an analysis of the ... with their impact from the short, medium, and long ... the industry, market, and technology trends that currently, prevail ... of concerned authorities to efficiently manage the increasing marine ...
Breaking Biology News(10 mins):Fingerprint Sensors Market Worth $14,500.07 Million by 2020 2Fingerprint Sensors Market Worth $14,500.07 Million by 2020 3Fingerprint Sensors Market Worth $14,500.07 Million by 2020 4TAKE Solutions Awarded Patent By USPTO 2Automatic Identification System Market by Class, by Platform, by Application and by Geography - Global Forecasts & Analysis to 2014 - 2020 2
(Date:7/29/2015)... TX (PRWEB) , ... July 29, 2015 , ... ... designer, manufacturer and supplier, announces the launch of their 2nd generation cell therapy ... the current miniPOD CT, but it also represents a new POD® design. ...
(Date:7/29/2015)... 2015  AmnioChor Inc., an early stage biotech startup ... to announce that the Musculoskeletal Transplant Foundation of ... in their seed round of development of the proprietary ... AmnioChor,s technology allows cryopreservation of the ... cells living within those tissues. Amnion is a well-established ...
(Date:7/29/2015)...  Indivior PLC (LON: INDV) today announced that the ... accepted and received Priority Review by the U.S. Food ... overdose. This naloxone nasal spray comes as a pre-filled ... into the nasal mucosa. 1 The device has ... be better equipped to help an opioid overdose victim. ...
(Date:7/29/2015)... QUEBEC CITY , July 29, 2015 /PRNewswire/ ... (the "Company") today announced it has selected an optimized ... important milestone in the development of a new ... The MAPK pathway represents a prime target for ... significant antitumor activities and survival benefits for B-Raf ...
Breaking Biology Technology:G-CON Manufacturing Launches Their 2nd Generation Cell Therapy Cleanroom POD® 2G-CON Manufacturing Launches Their 2nd Generation Cell Therapy Cleanroom POD® 3The Musculoskeletal Transplant Foundation Agrees to Invest in AmnioChor 2Indivior PLC Announces FDA Acceptance of Naloxone Nasal Spray New Drug Application With Priority Review 2Indivior PLC Announces FDA Acceptance of Naloxone Nasal Spray New Drug Application With Priority Review 3Indivior PLC Announces FDA Acceptance of Naloxone Nasal Spray New Drug Application With Priority Review 4Indivior PLC Announces FDA Acceptance of Naloxone Nasal Spray New Drug Application With Priority Review 5Aeterna Zentaris Announces Optimized Erk Inhibitor Compounds For Further Development 2Aeterna Zentaris Announces Optimized Erk Inhibitor Compounds For Further Development 3
Cached News: