基于TDTR技术水合物热导率测量方法

Thermal conductivity measurement of hydrate based on TDTR technology

四氢呋喃水合物(THF)是典形的笼形水合物,目前有关其热导率的报道较少,且都存在测量样品不是单一相、测量过程水合物发生分解等问题。采用基于飞秒脉冲激光的时域热反射法(TDTR)测量THF热导率。根据样品常温下是流体的特点,设计了可同时适用样品制备及TDTR测量的温控台,实现THF热导率非接触原位测量。获得THF热导率为0.6W/(m·K),Al/THF界面热导为90.3MW/(m^2·K)。该实验结果有助于理解并完善固体水合物微观导热机理,明晰水分子笼子和客体分子的耦合关系。

Tetrahydrofuran (THF) hydrate is a typical cage structure hydrate, and there are few reports on the thermal conductivity of THF, meanwhile, there are many problems such as the measurement sample is not a single phase and the hydrate is decomposed during the measurement process. In this paper, time domain thermal reflectance (TDTR) technique based on femtosecond pulse laser is employed to measure the thermal conductivity of tetrahydrofuran hydrate. According to the characteristic that the sample is fluid at room temperature, a temperature control platform which can be used for both sample preparation and TDTR measurement is designed to realize the non-contact in-situ measurement of THF thermal conductivity. The result of THF thermal conductivity is 0.6 W/(m·K), and interface thermal conductivity between Al and THF is 90.3 MW/(m^2·K). The experimental results obtained in this paper have great significance on understanding the microcosmic heat conduction mechanism of solid hydrates and clarifying the coupling relationship between the water molecules cage and guest molecules.