Navigation Links
Breaking harmful bonds
Date:8/28/2008

Waltham, MAEverybody loves the way breakfast eggs conveniently slide off of Teflon without leaving any pesky pieces of egg in the pan. Indeed, the carbon-fluorine bond at the heart of Teflon cookware is so helpful we also use it in clothing, lubricants, refrigerants, anesthetics, semiconductors, and even blood substitutes. But the very strength of the C-F bond that makes it useful in so many applications also gives it formidable greenhouse gas effects that persist in nature. In a groundbreaking study this week in Science, Brandeis scientists report they have identified a catalyst that efficiently breaks the C-F bond and converts it to a carbon-hydrogen bond, rendering it harmless to the environment.

Chlorofluorocarbons (CFCs or freons) are harmful to the ozone layer. Hydrofluorocarbons (HFCs) and perfluorocarbons (PFCs) are generating concern because they are considered super-greenhouse gases, with great potential to warm the environment by trapping solar radiation and remaining virtually indestructible in the atmosphere.

"The C-F bond is difficult to transform into other bonds under mild conditions because it is inert and unreactive; it's a challenge to chemists," said lead author chemist Oleg Ozerov, who conducted the research with postdoc Christos Douvris. "But we found a way to take a C-F bond that you can do very little with and break it and convert it cleanly into something else at room temperature."

With research support from the Department of Energy, Sloan Foundation, and Research Corporation, Ozerov identified a new catalytic process for a class of carborane-silylium compounds that causes the bonds in representative HFCs to react at room temperature, swapping their carbon-fluorine bonds for carbon-hydrogen bonds. The silylium catalyst performs the critical task of breaking the C-F bond by abstracting the fluoride from the fluorocarbon and attaching it to a silicon atom. The end product is a compound with a silicon-fluorine bond, which is no longer a greenhouse threat.

This finding could eventually lead to large-scale reactions to convert environmental pollutants that contain C-F bonds into products that could be reused or destroyed without special equipment.

"Conversion of PFCs remains a challenge, and our research efforts are directed at designing even more active catalysts, capable of PFC activation," said Ozerov.


'/>"/>

Contact: Laura Gardner
gardner@brandeis.edu
781-736-4204
Brandeis University
Source:Eurekalert

Related biology news :

1. EPA funds ground-breaking Lyme disease research
2. Breaking news: Study revives Olympic prospects for amputee sprinter
3. Shell-breaking crabs lived 20 million years earlier than thought
4. BGSU undergraduates to pilot groundbreaking genome project
5. Scientists discover record-breaking hydrogen storage materials for use in fuel cells
6. Speed plays crucial role in breaking proteins H-bonds
7. Groundbreaking Canada-US study proves link between emissions and mercury pollution in fish
8. Groundbreaking Canada-US study proves link between emissions and mercury pollution in fish
9. Certain anticancer agents could be harmful to patients with heart disease
10. Harmful algae taking advantage of global warming
11. Fish oil -- helpful or harmful?
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/11/2017)... 11, 2017  Michael Johnson, co-founder of Visikol Inc. a company ... has been named to the elite "Forbes 30 Under 30" list ... 600 people in 20 fields nationwide to be recognized as a ... applicants were selected. ... He is currently a PhD candidate at Rutgers University. ...
(Date:1/6/2017)... 5, 2017  Delta ID Inc., a leader in ... for automotive at CES® 2017. Delta ID has collaborated ... demonstrate the use of iris scanning as a secure, ... driver in a car, and as a way to ... Delta ID and Gentex will demonstrate (booth ...
(Date:1/3/2017)... 2017 Onitor, provider of digital health technology ... an innovative biometric data-driven program designed to aid weight ... the 2017 Consumer Electronics Show (CES) in ... U.S., the World Health Organization (WHO), have identified lifestyle ... who are overweight or obese. WHO also states that ...
Breaking Biology News(10 mins):
(Date:1/19/2017)... ... January 19, 2017 , ... ... the full spectrum of drug and device development, and Prism Clinical Research ... and clinicians, today announced Verified Clinical Trials (VCT) has been selected ...
(Date:1/19/2017)... BETHESDA, Md. , Jan. 18, 2017  Northwest ... company developing DCVax® personalized immune therapies for operable and ... Marnix Bosch , Chief Technical Officer of NW Bio, ... Thursday, January 19, 2017, at the Hyatt Regency Hotel ... Dr. Bosch will chair the session entitled "New Therapeutic ...
(Date:1/19/2017)... Jan. 18, 2017 BD (Becton, Dickinson and Company) (NYSE: ... that it will host a live webcast of its Annual Meeting ... The webcast can be accessed from the BD ... through Tuesday, January 31, 2017. ... About BD BD is a global medical ...
(Date:1/18/2017)... According to a new market research report "In situ Hybridization Market by Technique ... Diagnostic Laboratories, Academic and Research Institutions) - Global Forecast to 2021" published by ... USD 557.1 Million in 2016, growing at a CAGR of 5.8%. ... ... MarketsandMarkets Logo ...
Breaking Biology Technology: