Navigation Links
Glowing films developed by UC San Diego chemists reveal traces of explosives
Date:5/23/2008

New spray-on films developed by UC San Diego chemists will be the basis of portable devices that can quickly reveal trace amounts of nitrogen-based explosives.

Contaminated fingerprints leave dark shadows on the films, which glow blue under ultraviolet light. One of the films can distinguish between different classes of explosive chemicals, a property that could provide evidence to help solve a crime, or prevent one.

A recent episode of CSI: Miami featured the technology, which linked fingerprints left on a video camera to a bomb used in a bank heist, revealing the motive for the robbery. In real life, the security systems company RedXDefense has developed a portable kit based on the technology that security officers could use with minimal training.

Detection relies on fluorescent polymers developed at UCSD by chemistry and biochemistry professor William Trogler and graduate student Jason Sanchez. Its a very intuitive detection method that doesnt require a scientist to run, Trogler said.

Sanchez and Trogler describe the synthesis and properties of their polymers in a forthcoming issue of the Journal of Materials Chemistry.

The polymers emit blue light when excited by ultraviolet radiation. Nitrogen-based explosive chemicals such as TNT quench that glow by soaking up electrons.

Because the polymers fluoresce brightly, no special instruments are needed to read the results. Only a very thin film sprayed on a suspect surface is needed to reveal the presence of a dangerous chemical. A single layer of the polymer, about one thousandth of a gram, is enough to detect minute amounts of some explosives, as little as a few trillionths of a gram (picograms) on a surface a half-foot in diameter. Handling explosives can leave 1,000 times that quantity or more stuck to fingers or vehicles.

The films also adhere directly to potentially contaminated surfaces, making them more sensitive than previous methods, which rely on capturing molecules that escape into the air.

Detection can be fast, revealing incriminating fingerprints as soon as the solvents dry, within 30 seconds. Exposure to ultraviolet light for an minute or two alters one of the films so that traces a nitrate esters, a class chemicals that includes the highly explosive PTEN, begin to glow green. Traces of other classes of explosives, such as nitroaromatics like TNT, stay dark.

Troglers group is currently developing similar systems to detect explosives based on peroxides.


'/>"/>

Contact: Susan Brown
sdbrown@ucsd.edu
858-246-0161
University of California - San Diego
Source:Eurekalert

Related biology news :

1. Bright lights: Mystery of glowing antibody solved by Scripps research scientists
2. Films of Mitchell and Kenyon illuminate lefties decline in Victorian England
3. Microbial biofilms evoke Jekyll & Hyde effects
4. Turning on cell-cell communication wipes out staph biofilms
5. MIT crafts bacteria-resistant films
6. A new radiation therapy treatment developed for head and neck cancer patients
7. Model for the assembly of advanced, single-molecule-based electronic components developed at Pitt
8. New southernpeas developed by ARS, cooperators
9. New method developed to identify genetic determinants of Alzheimers disease
10. Biomagnetics developed for use in new breast cancer tests
11. Bioinformatics technology developed at Argonne provides new insight into microbial activities
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/11/2016)... CHICAGO , Jan. 11, 2016  higi, ... via nearly 10,000 retail locations, web and mobile, ... than $40 million from existing investors. ... will be devoted to further innovate higi,s health ... app and web portal – including expanding services ...
(Date:1/7/2016)... , Jan. 7, 2016 This BCC Research ... for biometric technologies and devices, identifying newer markets and ... various types of biometric devices. Includes forecast from 2015 ... Identify newer markets and explore the expansion of the ... Examine each type of biometric technology, determine its current ...
(Date:1/6/2016)... 2016  Varam Capital, a provider of micro-finance inclusion ... deliver advanced authentication solutions to their clients. Varam supplies ... A loan of a few thousand rupees may make ... ability to purchase livestock or equipment for a small ... for a local store. ...
Breaking Biology News(10 mins):
(Date:2/3/2016)... N.J. , Feb. 3, 2016 ... totaling more than $1 million for researchers in ... working on health-related research that demonstrates exciting potential. ... round of funding for the New Jersey Health Foundation ... faculty members at these educational institutions— Princeton University, ...
(Date:2/3/2016)... ... 2016 , ... ProMIS Neurosciences is currently in the process ... propagating strains of Amyloid beta involved in Alzheimer’s disease. The Company plans to ... on from the first misfolded Amyloid beta target announced on Nov. 12, 2015, ...
(Date:2/3/2016)... ... February 03, 2016 , ... ... annual report which summarizes and analyzes nearly 750 unique supply chain notifications ... and analysis service. , Supply chain risk management practitioners subscribe to the ...
(Date:2/3/2016)... Feb. 3, 2016  Today, Symphony Technology Group (STG) ... , a leading provider of primary research and analytics-based ... IMS Health , a global information and technology services ... and technologies will be integrated into IMS Health to ... market research capabilities. ...
Breaking Biology Technology: