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Study on heat conduction and adsorption/desorption characteristic of MIL-101/few layer graphene composite
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2021-04-03 , DOI: 10.1007/s10934-021-01074-4
Yu Yin , Junpeng Shao , Lin Zhang , Qun Cui , Haiyan Wang

Aiming at the poor heat conduction performance of porous MIL-101 applied in adsorption cooling process, few layer graphene (FLG) was selected as a promising thermal conductive additive to enhance thermal conductivity of MIL-101. The factors which influencing thermal conductivity of MIL-101/FLG composites were investigated. Thermal conductive mechanism of FLG for MIL-101 was discussed. Adsorption/desorption characteristics of water on the MIL-101/FLG composites were determined. Results show a two-dimensional structure of FLG with no defects and high degree of order is beneficial to the improvement of thermal conductivity for MIL-101/FLG composites. At 30 °C and bulk density of 0.55 g/cm3, thermal conductivity of MIL-101/20%FLG and MIL-101/25%FLG composite is 6.5 and 11.3 times higher than that of MIL-101. Thermal conductivity of MIL-101/FLG composites is related to the alignment direction of FLG and test direction of heat flow, and the interfacial thermal resistance between MIL-101 and FLG. Adding FLG in the MIL-101/FLG composites does not affect adsorption/desorption mechanism of water on the MIL-101. The addition of FLG can strengthen mass transfer and thermal diffusion process on the surface of MIL-101. Adsorption rate constant of water on the MIL-101/25%FLG composite is 2.05 times higher than that of MIL-101. The desorption temperatures and desorption activation energies of water on MIL-101/20%FLG and MIL-101/25%FLG composites are lower than those of MIL-101. It can provide basic research for the development of new adsorption water chiller working pair (MIL-101/FLG–water) with high efficiency.



中文翻译:

MIL-101 /几层石墨烯复合材料的导热与吸附/解吸特性的研究

针对吸附冷却过程中多孔MIL-101导热性能差的问题,很少选择石墨烯(FLG)作为增强MIL-101导热性的有前途的导热添加剂。研究了影响MIL-101 / FLG复合材料导热系数的因素。讨论了FL-MIL-101的导热机理。测定了水在MIL-101 / FLG复合材料上的吸附/解吸特性。结果表明,无缺陷且有序度高的FLG二维结构有利于提高MIL-101 / FLG复合材料的导热性。在30°C和0.55 g / cm 3的堆积密度下,MIL-101 / 20%FLG和MIL-101 / 25%FLG复合材料的热导率分别是MIL-101的6.5和11.3倍。MIL-101 / FLG复合材料的热导率与FLG的排列方向和热流的测试方向以及MIL-101和FLG之间的界面热阻有关。在MIL-101 / FLG复合材料中添加FLG不会影响水在MIL-101上的吸附/解吸机理。FLG的添加可以增强MIL-101表面的传质和热扩散过程。水在MIL-101 / 25%FLG复合材料上的吸附速率常数是MIL-101的2.05倍。MIL-101 / 20%FLG和MIL-101 / 25%FLG复合材料上水的解吸温度和解吸活化能低于MIL-101。

更新日期:2021-04-04
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