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MAY 2019 I DESIGN007 MAGAZINE 69 ly, therefore offering exceptionally low thermal resistance. With phase-change technology, a key benefit is the greatly reduced effects of pump out, making phase-change materials an excellent choice for applications that undergo widely varying temperatures. With thermal management playing more and more of a crucial role in electronics, it is like- ly that the stability of these new phase-change materials will see them take an overwhelming lead in thermal management technology. And as this technology rapidly develops, this will take effect sooner rather than later. DESIGN007 References 1. "Electrolube Addresses Major Market Changes to Thermal Management of LEDs," SMT007 Online. Jade Bridges is global technical support manager at Electrolube. To read past columns from Electrolube, click here. Also, visit to download your copy of Electrol- ube's book, The Printed Circuit Assembler's Guide to… Conformal Coatings for Harsh Environments, as well as other free, educational titles. In the nanoscale gaps, thermal radiation between ob- jects increases greatly with closer distances. The amount of heat transfer in this scale was found to be from 1,000 to 10,000 times greater than the blackbody radiation heat transfer, which was once considered the theoretical max- imum for the rate of thermal radiation. This phenomenon is called near-field thermal radiation. With recent devel- opments in nanotechnology, research into near-field ther- mal radiation between various materials has been active- ly carried out. Surface polariton coupling generated from nanostruc- tures has been of particular interest because it enhances the amount of near-field thermal radiation between two objects, and allows the spectral control of near-field ther- mal radiation. This advantage has motivated much of the recent theoretical research on the application of near- field thermal radiation using nanostructures such as thin films, multilayer nanostructures, and nanowires. Thus far, most of the studies have focused on measuring near-field thermal radiation between isotropic materials. A joint team led by Professor Bong Jae Lee and Pro- fessor Seung Seob Lee from the department of mechan- ical engineering at KAIST succeeded in measuring near- field thermal radiation according to the vacuum distance between metallo-dielectric (MD) multilayer nanostruc- tures by using a custom MEMS (microelectromechanical systems) device integrated platform with a three-axis nanopositioner. By measuring the near-field thermal radiation with a varying number of unit cells and the fill factor of the mul- tilayer nanostructures, the team demon- strated that the surface plasmon polari- ton coupling enhances near-field thermal radiation greatly and allows spectral con- trol over the heat transfer. The researcher's thermal radiation control technology can be applied to next-generation semiconductor packag- ing, thermophotovoltaic cells, and ther- mal management systems. It also has the potential to be applied to a sustainable energy source for IoT sensors. This research, led by Ph.D. Mikyung Lim and Ph.D. candidate Jaeman Song, was published in Nature Communications. (Source: KAIST) KAIST Technology Controls Near-field Thermal Radiation

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