López-Bueno C, Bugallo D, Leborán V, Rivadulla F
Centro de Investigación en Qumica Biolóxica e Materiais Moleculares (CIQUS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
Phys Chem Chem Phys. 2018 Mar 7;20(10):7277-7281. doi: 10.1039/c8cp00165k.
We present the analysis of the thermal conductivity, κ, and heat capacity, C, of a wide variety of liquids, covering organic molecular solvents, ionic liquids and water-polymer mixtures. These data were obtained from ≈0.6 μL samples, using an experimental development based on the 3ω method, capable of the simultaneous measurement of κ and C. In spite of the different type and strength of interactions, expected in a priori so different systems, the ratio of κ to the sound velocity is approximately constant for all of them. This is the consequence of a similar atomic density for all these liquids, notwithstanding their different molecular structures. This was corroborated experimentally by the observation of a C/V ≈ 1.89 × 10 J K m (≈3R/2 per atom), for all liquids studied in this work. Finally, the very small volume of the sample required in this experimental method is an important advantage for the characterization of systems like nanofluids, in which having a large amount of the dispersed phase is sometimes extremely challenging.
我们展示了对多种液体的热导率κ和热容C的分析，这些液体涵盖有机分子溶剂、离子液体和水 - 聚合物混合物。这些数据是使用基于3ω方法的实验技术从约0.6 μL的样品中获得的，该技术能够同时测量κ和C。尽管这些系统在类型和相互作用强度上有很大差异，但对于所有这些液体，κ与声速的比值大致恒定。这是由于所有这些液体具有相似的原子密度，尽管它们的分子结构不同。通过对本研究中所有液体观察到C/V ≈ 1.89 × 10 J K m（≈每个原子3R/2），这一点在实验上得到了证实。最后，这种实验方法所需的样品体积非常小，这对于表征诸如纳米流体之类的系统是一个重要优势，因为在纳米流体中获得大量分散相有时极具挑战性。
