Navigation Links
NASA, Purdue study offers recipe for global warming-free industrial materials
Date:5/3/2010

WEST LAFAYETTE, Ind. - Let a bunch of fluorine atoms get together in the molecules of a chemical compound, and they're like a heavy metal band at a chamber music festival. They tend to dominate the proceedings and not always for the better.

That's particularly true where the global warming potential of the chemicals is concerned, says a new study by NASA and Purdue University researchers.

The study offers at least a partial recipe that industrial chemists could use in developing alternatives with less global warming potential than materials commonly used today. The study was published in the Proceedings of the National Academy of Sciences.

"What we're hoping is that these additional requirements for minimizing global warming will be used by industry as design constraints for making materials that have, perhaps, the most green chemistry," says Joseph Francisco, a Purdue chemistry and earth and atmospheric sciences professor.

The classes of chemicals examined in the study are widely used in air conditioning and the manufacturing of electronics, appliances and carpets. Other uses range from applications as a blood substitute to tracking leaks in natural gas lines.

The chemicals include fluorine atom-containing compounds such as hydro fluorocarbons, per fluorocarbons, hydrofluoroethers, hydrofluoroolefins, and sulfur and nitrogen fluorides.

In a 2009 study, Francisco and NASA collaborators Timothy Lee and Partha Bera examined the molecular qualities that make fluorinated compounds even more powerful warming promoters than chemicals emitted in greater quantities, such as carbon dioxide and methane.

The fluorinated compounds proved to be far more efficient at blocking radiation -- or heat -- in the atmospheric window. The atmospheric window is the frequency range in the infrared region of the electromagnetic spectrum through which radiation from Earth is released into space. This helps cool the planet. When that radiation is trapped instead of being released, a greenhouse effect results, warming the planet.

The new study looked at a broader class of chemicals to identify molecular-level features that make them more or less efficient at trapping radiation in the atmospheric window. The study employed results from atomic-scale quantum chemistry calculations done on computers from NASA and Information Technology at Purdue (ITaP), Purdue's central information technology organization.

"We specifically looked at molecules that we felt would have potential for industrial use as replacements for chlorofluorocarbons," says Francisco, whose research focuses on the chemistry of molecules in the atmosphere.

Among other things, the study looked at how the number and placement of electronegative atoms in a molecule's structure affects its radiative efficiency. The number and placement of fluorine atoms proved to be a key factor because they're very electronegative and form highly polar bonds with carbon and sulfur.

Fluorine atoms thus tend to change the bond-polarity of the molecules -- modifying the bonds holding the atoms in the structure. This, in turn, affects how a molecule will absorb infrared radiation that normally passes through Earth's atmosphere and into space.

"The polarity change is what makes for an efficient absorber of infrared radiation," says Lee, chief of the Space Science and Astrobiology Division at NASA Ames Research Center.

One message from the study: Avoid allowing fluorines to bunch up in a molecular structure. "In other words, don't put them all on one atom," Francisco says. "Spread them out."

The fluorinated compounds also persist longer in the atmosphere than carbon dioxide and other major global warming agents, Lee and Francisco note. Even if emitted in lower quantities, fluorine-containing chemicals might have a powerful cumulative effect. Some don't break down for thousands of years.


'/>"/>

Contact: Greg Kline
gkline@purdue.edu
765-494-8167
Purdue University
Source:Eurekalert

Related biology news :

1. Purdue researchers click nutrition with camera diet study
2. Purdue research finds similarities in dog, human breast cancer pre-malignant lesions
3. Purdue researchers obtain a snapshot clarifying how materials enter cells
4. Purdue researchers propose way to incorporate deforestation into climate change treaty
5. Purdue researcher invents molecule that stops SARS
6. Purdue study suggests warmer temperatures could lead to a boom in corn pests
7. Purdue study finds dairy better for bones than calcium carbonate
8. Protein can help cells or cause cancer, Purdue researcher finds
9. Childhood obesity indicates greater risk of school absenteeism, Penn study reveals
10. A study by the MUHC and McGill University opens a new door to understanding cancer
11. Study begins to reveal clues to the cause and progression of sepsis
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/18/2017)... Calif. , April 18, 2017  Socionext Inc., a global ... of a media edge server, the M820, which features the company,s ... recognition software provided by Tera Probe, Inc., will be showcased during ... at the NAB show at the Las Vegas ... ...
(Date:4/11/2017)... April 11, 2017 Crossmatch®, a globally-recognized ... solutions, today announced that it has been awarded ... Projects Activity (IARPA) to develop next-generation Presentation Attack ... "Innovation has been a driving force within ... will allow us to innovate and develop new ...
(Date:4/6/2017)... -- Forecasts by Product Type (EAC), Biometrics, ... (Transportation & Logistics, Government & Public Sector, Utilities / ... Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality ... looking for a definitive report on the $27.9bn Access ... ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... ... ... San Diego-based team building and cooking events company, Lajollacooks4u, has unveiled a ... new look is part of a transformation to increase awareness, appeal to new markets ... It will also expand its service offering from its signature gourmet cooking classes and ...
(Date:10/10/2017)... CRUZ, Calif. , Oct. 10, 2017 ... grant from the NIH to develop RealSeq®-SC (Single Cell), ... kit for profiling small RNAs (including microRNAs) from single ... Analysis Program highlights the need to accelerate development of ... "New techniques for measuring ...
(Date:10/9/2017)... ... , ... At its national board meeting in North Carolina, ARCS® Foundation ... of Physics and Astronomy, has been selected for membership in ARCS Alumni Hall ... 2015 Breakthrough Prize in Fundamental physics for the discovery of the accelerating expansion of ...
(Date:10/7/2017)...  The 2017 Nobel Prize in Chemistry recognizes ... Joachim Frank and Richard Henderson ... (cryo-EM) have helped to broaden the use ... The winners worked with systems manufactured by Thermo ... resolved, three-dimensional images of protein structures that lead ...
Breaking Biology Technology: