种子辅助水热合成单分散 Au@C 核壳纳米结构以增强水基纳米流体的热扩散率

IF 2.5 4区 工程技术 Q3 CHEMISTRY, PHYSICAL
E. Cadena-Torres, Ma. de L. Ruiz-Peralta, J. F. Sanchez-Ramirez, A. R. Vilchis-Nestor, J. L. Jiménez-Pérez, R. Gutiérrez-Fuentes, R. Vela-Vázquez, A. Escobedo-Morales
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引用次数: 0

摘要

以葡萄糖为碳源,通过低温种子辅助水热法合成了 Au@C 核壳纳米结构(Au@C-NS)。材料表征和化学分析证实,该合成方法可以获得由结晶金属内核和无定形碳外壳构成的均匀的核壳纳米结构。根据合成条件的不同,它们的平均尺寸从 146 纳米到 342 纳米不等,相对标准偏差低至 7%。据推测,这种特征性的单分散性是由于碳相在液固界面上的高成核率造成的。获得的单分散 Au@C-NS 被用于制备具有优异热传导性能的水基纳米流体。热透镜分析表明,在颗粒浓度为 285 × 1011 ml-1 时,Au@C 纳米流体的热扩散率分别比对应的 Au 纳米流体和纯水高 9.5 % 和 31.3 %。在金属芯和碳壳界面上与声子相关的相互作用被认为是 Au@C 水性纳米流体热扩散率提高背后的热传导机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seed-Assisted Hydrothermal Synthesis of Monodispersed Au@C Core–Shell Nanostructures for Enhancing Thermal Diffusivity of Water-Based Nanofluids

Au@C core–shell nanostructures (Au@C-NS) were synthesized through a low-temperature seed-assisted hydrothermal approach using glucose as carbon source. The material characterization and chemical analysis confirm that the synthesis method allows to obtain uniform core–shell nanostructures constituted by a crystalline metal core and an amorphous carbon shell. Depending on the synthesis conditions, their average size ranges from 146 nm to 342 nm with relative standard deviation as low as 7 %. It is proposed that the characteristic monodispersity results due to a high nucleation rate of the carbon phase at the liquid–solid interface. The obtained monodisperse Au@C-NS were used to prepare water-based nanofluids with superior heat transport properties. The thermal lens analysis shows that the thermal diffusivity of Au@C nanofluids is 9.5 % and 31.3 % higher than their Au nanofluids counterparts and pure water, respectively, at particle concentration of 285 × 1011 ml−1. Phonon-related interactions at the metal cores and carbon shells interfaces are proposed as the heat transport mechanism behind the thermal diffusivity enhancement of the Au@C water-based nanofluids.

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来源期刊
CiteScore
4.10
自引率
9.10%
发文量
179
审稿时长
5 months
期刊介绍: International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.
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