Until now, there was no clear way to answer that question. Scientists are reporting development of a new method for screening molecules and predicting how certain materials, ranging from chemicals used in carpeting to electronics, will contribute to global warming. Their study is scheduled for the Nov. 12 issue of ACS' Journal of Physical Chemistry A, a weekly publication.
In the new study, Timothy Lee, Partha Bera, and Joseph Francisco note that carbon dioxide is the main greenhouse gas, which traps heat near Earth's surface like the panes of glass in a greenhouse. However, other gases have the same effect, and in fact are even more efficient greenhouse gases than carbon dioxide. Scientists know that the molecules in gases differ in their ability to contribute to global warming. But they know little about the hows and whys – the molecular basis of those differences.
The scientists analyzed more than a dozen molecules involved in global warming to find out which chemical and physical properties are most important in determining their inherent radiative efficiency, and thus possess the largest potential to contribute to global warming. They found that molecules containing several fluorine atoms tend to be strong greenhouse gases, compared to molecules containing chlorine and/or hydrogen. They found for the first time that molecules containing several fluorine atoms bonded to the same carbon increase their radiative efficiency in a non-linear fashion. "It is hoped that the results from this study will be used in the design of more environmentally friendly materials," the study notes.
ARTICLE #1 FOR IMMEDIATE RELEASE "Identifying the Molecular Origin of Global Warming"
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A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
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The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
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The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.
Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...
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