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posted by Fnord666 on Tuesday December 03 2019, @06:43AM   Printer-friendly
from the hot-topic dept.

Arthur T Knackerbracket has found the following story:

The gas turbines powering aircraft engines rely on ceramic coatings that ensure structural stability at high temperatures. But these coatings don't control heat radiation, limiting the performance of the engine.

Researchers at Purdue University have engineered ceramic "nanotubes" that behave as thermal antennas, offering control over the spectrum and direction of high-temperature heat radiation.

Researchers have engineered ceramic nanotubes, which act as antennas that use light-matter oscillations to control heat radiation. The design is a step toward a new class of ceramics that work more efficiently at high temperatures.

The work is published in Nano Letters, a journal by the American Chemical Society. An illustration of the ceramic nanotubes will be featured as the journal's supplementary cover in a forthcoming issue.


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  • (Score: 1) by Ethanol-fueled on Tuesday December 03 2019, @06:59AM (1 child)

    by Ethanol-fueled (2792) on Tuesday December 03 2019, @06:59AM (#927564) Homepage

    I guess that's why the word "antenna" was somewhere in there. The material is probably drawn into fibers and then the ceramic filler is doped with them, possibly with the fibers themselves aligned in a certain direction or randomly aligned depending on the application.

    • (Score: 0) by Anonymous Coward on Wednesday December 04 2019, @01:00AM

      by Anonymous Coward on Wednesday December 04 2019, @01:00AM (#927916)

      My re-write: the nanotubes are acting like directional antennas--at infrared (heat radiation) frequencies/wavelengths. From Google/Wikipedia first hit:

      > Infrared radiation extends from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 millimeter (mm). This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz. Below infrared is the microwave portion of the electromagnetic spectrum.

      To be resonators the nanotubes have to be the same or a low multiple of the wavelength they want to control...someone else can do the math! It sure would be nice to have the radiation cooling of turbine blades directed away from other hot parts of the engine.

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