By a News Reporter-Staff News Editor at Science Letter -- Current study results on Materials Science and Physical Chemistry have been published. According to news reporting from Gaithersburg, Maryland, by NewsRx journalists, research stated, "We observe a resonant transition in the microwave absorption of thin thermally deposited Au nanoparticle films near the geometrical percolation transition Pc where the films exhibit a 'fractal' heterogeneous geometry. Absorption of incident microwave radiation increases sharply near p, consistent with effective medium theory predictions."
The news correspondents obtained a quote from the research from the National Institute of Standards and Technology, "Both the theory and our experiments indicate that the hierarchical structure of these films makes their absorption insensitive to the microwave radiation wavelength lambda, so that this singular absorption of microwave radiation is observed over a broad frequency range between 100 MHz and 20 GHz. The interaction of electromagnetic radiation with randomly distributed conductive scattering particles gives rise to localized resonant modes, and our measurements indicate that this adsorption process is significantly enhanced for microwaves in comparison to ordinary light."
According to the news reporters, the research concluded: "In particular, above the percolation transition a portion of the injected microwave power is stored within the film until dissipated."
For more information on this research see: Resonant Microwave Absorption in Thermally Deposited Au Nanoparticle Films Near Percolation Coverage. Langmuir, 2013;29(28):9010-9015. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
Our news journalists report that additional information may be obtained by contacting J. Obrzut, Natl Inst Stand & Technol, Gaithersburg, MD 20899, United States. Additional authors for this research include J.F. Douglas, O. Kirillov, F. Sharifi and J.A. Liddle (see also Materials Science and Physical Chemistry).
Keywords for this news article include: Maryland, Gaithersburg, United States, North and Central America, Materials Science and Physical Chemistry
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