An experimental study of thermal diffusivity of Au nanoparticles: effects of concentration particle size
An experimental study of thermal diffusivity of Au nanoparticles: effects of concentration particle size
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Au纳米颗粒热扩散率的实验研究：浓度粒径的影响
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Raeisi
中科院分区：
文献类型：
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作者：
E. Shahriari;M. Moradi;M. Raeisi
在本文中，通过伽马辐射在不同浓度的聚乙烯吡咯烷酮（PVP）溶液中制备了金纳米颗粒。将溶液以 50 kGy 的剂量进行辐照，以制成不同的尺寸。使用nanopox机器测量制备的样品中颗粒的平均尺寸。采用双光束模式失配热透镜（TL）方法研究了样品热扩散率的影响。 TL 测量分别使用绿色二极管激光器（波长 532 nm，60 mW）和 He-Ne 激光器（波长 632.8 nm，0.5 mW）作为激发源和探测光束进行。结果表明，样品的热扩散率随着粒径和溶液密度的增大而增强。这种增量可归因于颗粒-液体界面处的声子散射以及纳米颗粒与周围液体之间的接触。
In this article, Au nanoparticles in polyvinylpyrrolidone (PVP) solution were prepared by gamma radiation at different concentrations. The solutions were irradiated at doses of 50 kGy for making different sizes. The average sizes of particle in the prepared samples were measured using the nanophox machine. A dual-beam mode-mismatched thermal lens (TL) method was used to investigate the effect of thermal diffusivity of samples. The TL measurement was carried out using a green diode laser (wavelength 532 nm, 60 mW) and a He–Ne laser (wavelength 632.8 nm, 0.5 mW) for excitation source and probe beam, respectively. The results showed that the thermal diffusivity of samples enhances with the growth of particle size and density of solutions. This increment can be attributed to phonon scattering at interface of particles–liquid and contact between the nanoparticles and surrounded liquid.