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1Timescale of thermal transport in "diamond-water"
nanointerface
A. Romshin*, D. Pasternak, I. Tiazhelov, A. Martyanov, V. Sedov, I. Vlasov
Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
Recent advancements in thermal nanoprobing techniques, which enable the mapping of temperature distribution and precise heat perturbation in physical and living systems [1], underscore the need for a deep understanding of nanoscale thermal transport. Conventional theory of heat transfer is insufficient to accurately describe the phenomena observed at such scales, where the interface conductance between solid particles and liquids becomes a critical factor [2]. In recent years, heat transfer mechanisms at solid-liquid interfaces have been studied in either nanostructured bulk crystals wetted with liquid [3] or colloidal suspensions of metallic nanoparticles [4]. However, these methods often yielded averaged thermal properties and can result in inaccurate estimations of interfacial thermal conductance.
In this work thermal transport across the diamond-water nanointerface is investigated. Utilizing single diamond micro- and nanoparticles, which combine thermometric and heating capabilities, we precisely determine the rise and relaxation times of stepwise heating with submicrosecond resolution for a wide range of crystal sizes from 250 nm to 1.5 ^m. For the 1.5 ^m diamond, it was found that the time required to heat the local volume of water by 10°C and reach thermodynamic equilibrium is approximately 5.2 ^s, while the relaxation to environmental conditions takes longer, around 116 ^s. Subsequently, the rate of thermal transport significantly increases with decreasing particle size. For the smallest nanodiamond, the rise and relaxation times were determined to be 90 ns and 1.6 ^s, respectively. An order of magnitude superiority of rising rate over relaxation one might be connected with fast heating of nanocrystal separately from water due to higher thermal conductivity of diamond compared to water. Our results allow for an accurate assessment of the thermal properties at the interface, providing insights that are critical for advancing nanotechnology and improving the thermal management of nanoscale systems.
This work was supported by Russian Science Foundation, grant No 23-14-00129 (https://rscf.ru/project/23 -14-00129/).
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