Department News

The publication of Soft Matter journal and the selection of back cover under the theme of prediction of thermal conductivity of liquid metal composite.

관리자 2020.06.12

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Professor Seunghwa Ryu’s research team predicted the thermal conductivity of a liquid metal composite using micromechanics based homogenization method. Eshelby solution based Eshelby method, Mori-tanaka method, differential method, double inclusion method are applied and compared with experimental data. While a PDMS has a low thermal conductivity, liquid metal composite has high thermal conductivity and electrical insulation properties, so the liquid metal composite is attracting attention as a packaging material for soft robot or wearable devices. In addition, thanks to its flexible properties, it is expected to be utilized in thermoelectric modules to reduce contact heat resistance. When the liquid metal composite is stretched, the liquid particles therein resist deformation by surface tension, and the intensity of the resistance is determined depending on the size of particle. In this study, the change in thermal conductivity according to the tensile strain of a liquid metal composite was predicted by considering surface tension and particle size. Previous studies could not predict the changes in the behavior of thermal conductivity depending on particle size. This study showed that the smaller the particle size, the greater the influence of the surface tension, so that the particle tries to maintain the spherical shape, and accordingly the change in thermal conductivity decreases. This study was conducted in collaboration with Ph.D candidate Jiyoung Jung and Prof. Seunghwa Ryu of KAIST, Prof. Klas Hjort, and Ph.D. Seunghee Jeong of Uppsala university in Sweden. This paper is published in the journal Soft Matter titled as “Investigation of thermal conductivity for liquid metal composites using the micromechanics-based mean-field homogenization theory” and selected in the inside back cover.
 
 
<Paper information>
Jung, J., Jeong, S., Hjort, K.,& Ryu, S. (2020). Investigation of thermal conductivity for liquid metal composites using the micromechanics-based mean-field homogenization theory. Soft Matter.