A strategy of imidazole ionic liquids containing metallic element [Cneim][SbF6] (n = 4, 5) as innovative media in sustainable heat transfer processes. (January 2023)

• Record Type: Journal Article
• Authors: Wei, Jie; Ren, Caixia; Zhang, Yuxin; Liang, Kunhao; Fang, Dawei; Gao, Peizhen
• Is Part Of: International communications in heat and mass transfer. Volume 140(2023)
• Publication Date: 2023-01
• Subjects: Hexafluoride antimonite ionic liquids -- Heat capacity -- Energy storage density -- Thermal conductivity -- Heat-transfer fluids; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Heat -- Transmission; Mass transfer; Periodicals; 621.4022
• DOI: 10.1016/j.icheatmasstransfer.2022.106541
• Languages: English
• ISSNs: 0735-1933

Abstract

Abstract: As everyone knows, ionic liquids have excellent properties, which is potential for applying to alternatives to environment-hagardous heat-transfer fluids in practical application. Two imidazole-based ionic liquids containing metallic element Sb, [C n eim][SbF6 ] ( n = 4, 5) were designed and characterized. The heat capacity was precisely measured from (80 to 393) K. In view of experimental data, the average glass transition temperatures are 176.494 ± 0.355 K for [C4 eim][SbF6 ] and 181.946 ± 0.519 K for [C5 eim][SbF6 ]. Compared with reported ILs and commercial HTFs, [C4 eim][SbF6 ] and [C5 eim][SbF6 ] have a comparable or even wider operating temperature ranges. More importantly, the ILs remain liquid at about −16 °C for [C4 eim][SbF6 ] and about −30 °C for [C5 eim][SbF6 ], which is a preponderance of working in cold natural environments. The standard molar heat capacities were also obtained. Then, the thermal conductivity and dynamic viscosities were measured and Prandtl number were calculated and its range of 2204–379 are observable in 293.15 K - 323.15 K for [C n eim][SbF6 ] ( n = 4, 5), and they are most similar to Marlotherm SH and Therminol 66, respectively. Combined with density and surface tension values reported in our previous work, the isochoric molar heat capacity and thermal storage density were figured out. Meanwhile, the corresponding properties were compared with that of commercial ones and discussed. Finally, the heat transfer coefficient and the heat transfer area are explored in the specific heat transfer process. The results suggest that [C n eim][SbF6 ] ( n = 4, 5) could be promising heat-transfer fluids.