Solid-liquid interface thermal conductivity measurement system based on femtosecond laser pumping experiment system Recently, the Research Center for Heat and Mass Transfer of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences in collaboration with researchers at the University of Notre Dame has established a solid-liquid interface thermal conductivity measurement system based on a femtosecond laser pumping experiment system, and uses the system for multiple solids. The thermal conductivity at the interface with the liquid material is measured. Solid materials include metallic aluminum and metallic gold. Liquid materials include water, alcohol, hexadecane, and paraffin. The thermal transport properties of the solid-liquid interface play a crucial role in the application of composite polymer materials, nanofluids, thermal management of electronic devices, and nanoparticle-assisted therapy. For example, the thermal conductivity of nanofluids may be much higher than the corresponding liquid's thermal conductivity, so it is expected to be widely used in microelectronic devices, fuel cells, chemical pharmaceuticals, automotive engines and other fields. However, in nanomaterials such as nanofluids, the total surface area of ​​solid and liquid materials within a finite volume increases rapidly with the reduction of structural features, and the thermal transport properties of the solid-liquid interface affect the thermal input of the material in practical applications. The impact of transport performance is very significant. If the heat transfer within the material is analogized to the traffic on the road, then the solid-liquid interface is a crossroad on the road. The capacity of the intersection determines the capacity of the entire road, and self-assembly The monomolecular layer is an overpass that improves the crossroads capacity. Therefore, the research on the mechanism of the interface heat transport and the regulation of the thermal transport properties of the solid-liquid interface will play an important role in the development of the above-mentioned industries. Through the analysis of the solid-liquid interface thermal conductivity measurement results and the use of molecular dynamics simulation methods to calculate the thermal conductivity of the solid-liquid interface, the researchers conducted a systematic and detailed study of the mechanism and influencing factors of the solid-liquid interface heat transport, including solid The Influence of Liquid Interface Wettability and Molecular Vibration Dynamic Density Matching on the Heat Transport Performance of Solid - liquid Interface . Based on experimental and theoretical guidance, researchers further tried to regulate the heat transfer properties of the solid-liquid interface. The researchers used molecular self-assembly technology to prepare a series of self-assembled monolayers with similar molecular structure to liquid hexadecane on the surface of metallic gold, including mercaptan molecules with from 2 to 18 carbon atoms. These mercaptan molecules can The formation of covalent bonds with metallic gold also has a similar distribution of molecular vibrational dynamic density with liquid hexadecane, thus acting as a bridge in the heat transport process of metallic gold and liquid hexadecane. The researchers have greatly improved the use of this method. The thermal transport performance of the solid-liquid interface increases the interface thermal conductivity by a maximum of about 5 times. This method is expected to be applied to a wider range of industries and promote the practical application of micro/nano scale solid-liquid thermal management systems. (Yang Qi) Australia Toilet,small swim spa,swim tub,above ground swim spa,swim spa hot tub combo Guangzhou Aijingsi Sanitary Products Co.,Ltd , https://www.hottubdesign.com