Thermophysical Properties of 1-Ethyl-3-methylimidazolium Ethylsulfate and 1-Butyl-3-methylimidazolium Methylsulfate Ionic Liquids

Fernandez, Angela; Torrecilla, José S.; García, Julián; Rodrı́guez, Francisco

doi:10.1021/je7002786

Cited by 158 publications

(127 citation statements)

References 17 publications

(64 reference statements)

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“…7 shows that OmimPF 6 started to decompose at 350 • C and it decomposed almost completely at 500 • C, without any char formation. Figure 7 reports DSC results for OmimPF 6 showing two exothermic peaks, which were assigned to PF 6 anion at 370 • C and subsequently imidazolium cation at 400 • C, consistently with previous TGA observations and the difference in molar mass of the counterions (Fernandez et al 2007). Figure 8a shows the TGA curves of the supports after being subjected to oven drying at 105 • C for 2 hours.…”

Section: Figsupporting

confidence: 84%

“…Even though the decomposition temperature of pure IL is above the process temperature, the interaction with the support may lead to reduced stability. As a first approach, the thermal stability of pure IL was examined by TGA and DSC within range of 50-600 • C. Previous works showed that common imidazolium-based ILs, such as OmimPF 6 , have very high thermal decomposition temperature and that the anion decomposes before the cation (Fernandez et al 2007). The TGA curve in Fig.…”

Section: Figmentioning

confidence: 99%

“…In addition, results on the thermal stability of SILP materials at high temperature by means of TGA and DSC analysis are collected herein together for the first time. To the best of our knowledge, only thermal studies of ILs have been so far reported (Fernandez et al 2007;Holbrey et al 2002;Karna et al 2009), but without analyzing the relationship between IL and support, except two recent works where a thermal study of SILP materials has been reported (Vangeli et al 2010;Kohler et al 2010). Some of the works published in the literature (Zhang et al 2009a;Vangeli et al 2010;Kohler et al 2010;Muldoon 2010;Kim et al 2002) showed SILP applications at high temperatures based on different supports.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Supported Ionic Liquid Phase (SILP) materials prepared from different supports

et al. 2011

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Supported ionic liquid phase (SILP) materials are a recent concept where a film of ionic liquid (IL) is immobilized on a solid phase, combining the advantages of ILs (non volatility, high solvent capacity, etc.) with those of heterogeneous support materials. In this work, new SILP materials were prepared using a series of supports with different porosity and chemical nature. An imidazolium-based IL, 1-methyl-3-octylimidazolium hexafluorophosphate (OmimPF 6 ), was confined at variable contents (5-60% w/w) in three different activated carbons (ACs), silica (SiO 2 ), alumina (Al 2 O 3 ) and titania (TiO 2 ).For the first time, a systematic characterization of different SILP systems has been carried out applying a variety of analytical and spectroscopic techniques to provide information of interest on these materials. Elemental analysis (EA), adsorption-desorption isotherms of N 2 at 77 K, mercury porosimetry, termogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electronic microscopy (SEM) and energy dispersive X-ray (EDX) were conducted to explore confinement effects. The results demonstrate that EA is a useful tool for quantifying the amount of imidazolium-based IL incorporated on support, independently of the nature of the solid. An excellent correlation has been obtained between the percentage of elemental nitrogen and the IL loaded on the support. The combination of nitrogen adsorption-desorption isotherms at 77 K and mercury porosimetry measurements was used to characterize the pore structure of both supports and SILP materials. It was found that depending on the available pores in the solid support, the IL tends to fill micropores firstly, then mesopores and lately in macropores. Thermal properties of SILP materials were studied herein by using both TGA and DSC methods, evidencing that the stability of SILP materials and the decomposition mechanism are strongly dependent on the surface chemistry of the solid support. SEM and EDX provided evidences of external surface coverage by ILs and filling of macropores at high IL load.

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Section: Figsupporting

confidence: 84%

Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Supported Ionic Liquid Phase (SILP) materials prepared from different supports

et al. 2011

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“…The first range (40-71 • C) corresponds to a dehydration process and can probably be originated from minor water molecules impurity in the sample. Next step of the thermal decomposition in the temperature range (253-320 • C) corresponds to the decomposition of anion [NTf to 400 • C [15][16][17]. In our case, we considered the temperature corresponding to the second degradation step (Td 2 ) as the operational limit for the studied ionic liquid.…”

Section: Thermal Decomposition Studiesmentioning

confidence: 99%

Bis-methyl imidazolium methylidene bis(trifluoromethanesulfonyl)imide, crystal structure, thermal and dielectric studies

et al. 2016

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A new geminal di-cationic ionic liquid (IL) containing a central cationic unit methylidene capped by a basic functionality (imidazole) is synthesized. The compound was characterized by means of 1 H, 13 C, 19 F NMR, IR and Raman spectroscopies and its crystal structure is confirmed by single crystal X-ray diffraction method. The X-ray studies on ([M(CH 2 )IM 2+ ][2NTf −2 ]) show that it crystallizes in monoclinic system with space group: P 21/c. Thermal properties were investigated in the temperature range from 0 to 400 • C by using differential thermal (DTA) and thermogravimetric (TGA) analyses. The frequency-dependent electrical data are discussed using complex dielectric permittivity in the frequency range of (10 −2 -10 6 Hz) and in the temperature range of −50 • to 20 • C. The outstanding dielectric and thermal properties make this IL as promising candidate for electrochemical devices.

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“…The high agreement in the first steps of degradation for the IL mixture evaluated should be completed with a higher collection of this kind of data in order to find a general trend. This aspect would be of interest in order to quickly predict several stability parameters only by knowing pure IL dynamic thermogravimetric analysis (TG) data, which are widely available in the literature [26][27][28][29][30][31][32]. Also other thermal properties of binary mixtures of ILs could be also measured, looking for useful predictive models [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Thermal stability and specific heats of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} mixed ionic liquid solvents

Navarro

Larriba

Beigbeder

et al. 2014

J Therm Anal Calorim

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In the last years, mixing ionic liquids (ILs) is a common trend looking for IL-based solvents with high extractive properties in the liquid-liquid extraction of aromatics from alkanes. The aim of mixing ILs is to find intermediate extractive properties between ILs which showed good selectivity and those with high aromatic capacity of extraction. In addition to this, there are several thermophysical properties that are of interest to evaluate an IL-based solvent. Therefore, many studies have been carried out focusing on the knowledge of density, viscosity, or surface tension behavior of IL mixture, proposing several mixing rules that could correctly predict these magnitudes from pure IL data in most of the mixtures studied. However, only a few measurements of thermal stabilities and specific heats for IL binary mixtures have been recently realized. The present study was aimed to evaluate the thermal stability of {[bpy][BF 4 ] ? [bpy][Tf 2 N]} and {[bpy][BF 4 ] ? [4bmpy][Tf 2 N]} IL mixtures by thermogravimetric analysis. Also specific heats of the IL mixtures were determined using differential scanning calorimetry.

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Thermophysical Properties of 1-Ethyl-3-methylimidazolium Ethylsulfate and 1-Butyl-3-methylimidazolium Methylsulfate Ionic Liquids

Cited by 158 publications

References 17 publications

Characterization of Supported Ionic Liquid Phase (SILP) materials prepared from different supports

Characterization of Supported Ionic Liquid Phase (SILP) materials prepared from different supports

Bis-methyl imidazolium methylidene bis(trifluoromethanesulfonyl)imide, crystal structure, thermal and dielectric studies

Thermal stability and specific heats of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} mixed ionic liquid solvents

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