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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of formation of 'long range' secondary dendritic nanostructures in molten salt nanofluids on the values of specific heat capacity
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Effect of formation of 'long range' secondary dendritic nanostructures in molten salt nanofluids on the values of specific heat capacity

机译：熔盐纳米流体中“长程”二级树枝状纳米结构的形成对比热容值的影响

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摘要

Several studies in recent literature have demonstrated the enhancement of specific heat capacity (Cp) of molten-salts on doping with minute concentration of nanoparticles, especially when the synthesis conditions enabled the formation of stable colloidal suspensions (which are also known as "molten-salt nanofluids"). In this study we present additional evidence in support of theory proposed earlier in the literature that stable colloidal suspensions of nanoparticles in a molten-salt medium induces the preferential surface adsorption of the constitutive chemical species in the salt mixture which in turn leads to the nucleation of solid phase of the molten salt (with perhaps a different chemical composition than in the bulk phase) on the nanoparticle surface. The surface adsorbed salt species leads to the nucleation and growth of a semi-solid layer of dendritic shaped phase (dendritic shaped secondary "long range" nanostructures). Incidentally, such nanostructures were not observed in electron microscopy images for samples of pure molten-salt mixtures subjected to control experiments (i.e., without nanoparticles). Hence, this study conclusively demonstrates that the existence of these nanostructures is primarily responsible for the enhancement of specific heat capacity. In this study, three different types of nanoparticles are dispersed in the same molten-salt mixture ("base fluid") and the experimentally measured values of specific heat capacity enhancements obtained in this study are correlated to the formation of dendritic nanostructures that are observed in the images obtained from the electron microscopy of the molten-salt nano-material samples.
机译：最近的几项研究表明，掺杂微小浓度的纳米粒子后，熔融盐的比热容（Cp）会提高，尤其是在合成条件下能够形成稳定的胶体悬浮液（也称为“熔融盐”）时纳米流体”）。在这项研究中，我们提供了更多的证据来支持先前在文献中提出的理论，即纳米颗粒在熔融盐介质中的稳定胶体悬浮液会诱导盐混合物中本构化学物种的优先表面吸附，进而导致成核物质的成核。纳米颗粒表面上熔盐的固相（化学成分可能与本体相不同）。表面吸附的盐物质导致树突状相（树突状次级“长程”纳米结构）的半固态层的成核和生长。顺便提及，在经受对照实验（即，没有纳米颗粒）的纯熔融盐混合物的样品的电子显微镜图像中未观察到这种纳米结构。因此，这项研究最终证明了这些纳米结构的存在主要是由于比热容的提高。在这项研究中，将三种不同类型的纳米颗粒分散在同一熔融盐混合物（“基础流体”）中，并且在本研究中获得的比热容增强的实验测量值与在纳米管中观察到的树枝状纳米结构的形成相关。从熔融盐纳米材料样品的电子显微镜获得的图像。

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