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Author Ma, Y. ♦ Ghafari, A. ♦ Budaev, B. V. ♦ Bogy, D. B.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ EQUIPMENT ♦ FORECASTING ♦ HEAT FLUX ♦ HEAT TRANSFER ♦ JOULE HEATING ♦ NANOSTRUCTURES ♦ PHONONS ♦ POSITIONING ♦ SENSORS ♦ SOLIDS ♦ SURFACES ♦ THERMAL EXPANSION ♦ THERMAL RADIATION
Abstract We present here a controlled measurement of heat flux across a closing gap that is initially less than 10 nm wide between two solid surfaces at different temperatures. The measured heat transfer is compared with our published theoretical analyses of this phenomenon that show thermal radiation dominates the heat transfer for gaps wider than about 1–2 nm, but phonon conduction dominates between 1 and 2 nm and contact. The experiments employ a thermal actuator mounted on a rocking base block for coarse positioning that supplies Joule heating to an embedded element to cause thermal expansion of a localized region for less than 10 nm spacing control, together with an embedded near-surface resistive temperature sensor to measure its temperature change due to the heat flux across the gap. The measured results are in general agreement with the theoretical predictions, and they also agree with common sense expectations. This paper not only shows nano-scale heat transfer measurement across a closing gap, it also lends additional strong support to the validity of the referenced theoretical developments. The proposed experimental approach can provide support to design of future devices for nano-scale heat transfer measurement.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-05-23
Publisher Place United States
Journal Applied Physics Letters
Volume Number 108
Issue Number 21


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