Experimental investigation of thermo-physical properties of geminal dicationic ionic compounds for latent thermal energy storage

Liu, Jianlian; Yang, Wenge; Li, Zhuo; Ren, Fei; Hao, Hong

doi:10.1016/j.molliq.2020.112994

Cited by 19 publications

(19 citation statements)

References 27 publications

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“…The values of DILs are 30-40 °C higher than their monocationic counterparts [134][135][136]. Other studies have obtained similar conclusions, which are ascribed to higher charges, higher molecular weight, and greater intermolecular interactions of DILs [6,129,137]. Due to their stronger electrostatic interactions, DILs often demonstrate higher melting points than monocationic ILs, which limits their applications [69].…”

Section: Dicationic Ilsmentioning

confidence: 85%

“…Due to their unique properties, dicationic ILs (DILs) have been widely used in thermal storage [67,129], organic synthesis [130], anti-corrosion [131], or as surface-active agents [132], and they are less toxic than their monocationic counterparts [133]. Figure 16.…”

Section: Dicationic Ilsmentioning

confidence: 99%

“…Moreover, Figure 17 suggests that the longer the alkyl side chains are, the lower the thermal stability of DILs are. The reduced thermal stability is attributed to the decreasing symmetry of cations with the increase of the number of carbon atoms in the alkyl side chains, which hinders the crystal effective accumulation [129,139]. Table 14 demonstrates that the decomposition temperatures of DILs with some functional groups are higher than those of DILs without corresponding functional groups.…”

Section: Dicationic Ilsmentioning

confidence: 99%

“…Recently, DILs with m-xylyl, pyridine functional groups, and dioxane linkage chain have been synthesized, and all of them have a low melting point and high thermal stability [140][141][142]. Similar to monocationic ILs, anions have a major influence in the thermal stability of DILs, and Table 15 reveals that the thermal stability order is as follows: [129,141]. The [NTf2] -DILs also have high thermal stability and low melting point [37,138,140].…”

Section: Dicationic Ilsmentioning

confidence: 99%

“…Thermal decomposition temperature of [C2(CnIM)2][Br]2 and [C4(CnIM)2][Br]2 at a heating rate of 10 °C /min in nitrogen atmosphere[129,139] (n = 1-4).…”

mentioning

confidence: 99%

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Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Cheng

2021

Processes

111

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Ionic liquids (ILs) are the safest solvent in various high-temperature applications due to their non-flammable properties. In order to obtain their thermal stability properties, thermogravimetric analysis (TGA) is extensively used to analyze the kinetics of the thermal decomposition process. This review summarizes the different kinetics analysis methods and finds the isoconversional methods are superior to the Arrhenius methods in calculating the activation energy, and two tools—the compensation effect and master plots—are suggested for the calculation of the pre-exponential factor. With both parameters, the maximum operating temperature (MOT) can be calculated to predict the thermal stability in long-term runnings. The collection of thermal stability data of ILs with divergent cations and anions shows the structure of cations such as alkyl side chains, functional groups, and alkyl substituents will affect the thermal stability, but their influence is less than that of anions. To develop ILs with superior thermal stability, dicationic ILs (DILs) are recommended, and typically, [C4(MIM)2][NTf2]2 has a decomposition temperature as high as 468.1 °C. For the convenience of application, thermal stability on the decomposition temperature and thermal decomposition activation energy of 130 ILs are summarized at the end of this manuscript.

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Section: Dicationic Ilsmentioning

confidence: 85%

Section: Dicationic Ilsmentioning

confidence: 99%

Section: Dicationic Ilsmentioning

confidence: 99%

Section: Dicationic Ilsmentioning

confidence: 99%

“…Thermal decomposition temperature of [C2(CnIM)2][Br]2 and [C4(CnIM)2][Br]2 at a heating rate of 10 °C /min in nitrogen atmosphere[129,139] (n = 1-4).…”

mentioning

confidence: 99%

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Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Cheng

2021

Processes

111

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Dicationic Imizadolium‐Based Tetrafluoroborate Ionic Liquids: Synthesis and Hydrothermal Stability Study

Cheng

2022

ChemistrySelect

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Six novel dicationic imizadolium‐based tetrafluoroborate ionic liquids were synthesized, with four of which contained hydroxyl groups. Their chemical structures were identified by FTIR and 1H NMR, and their onset decomposition temperatures (Tonset) were measured by thermogravimetric analysis (TGA). For investigating the hydrothermal stability, all DILs were mixed with water and heated for 1, 5, and 9 hours to 240 °C in an airtight kettle.The results show that DILs with hydroxyls have a higher Tonset but they exhibit evident changes in chemical structures after heating with water for 9 hours. The conflicts between Tonset and long‐term stability tests is ascribed to the reason that water forms new hydrogen bonds with hydroxyls and therefore weakens the intramolecular interaction between the cation and anion.

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Experimental and theoretical studies of physicochemical properties of Gemini imidazolium ionic liquids: hydroxyl group in spacer chain and alkyl chain length of cation

Wang,

Zhang,

Chen

et al. 2024

Ionics

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Experimental investigation of thermo-physical properties of geminal dicationic ionic compounds for latent thermal energy storage

Cited by 19 publications

References 27 publications

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

Dicationic Imizadolium‐Based Tetrafluoroborate Ionic Liquids: Synthesis and Hydrothermal Stability Study

Experimental and theoretical studies of physicochemical properties of Gemini imidazolium ionic liquids: hydroxyl group in spacer chain and alkyl chain length of cation

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