Ion exchange synthesis and thermal characteristics of some [N+4444] based ionic liquids

Bhatt, Vasishta; Gohil, Kuldip

doi:10.1016/j.tca.2013.01.003

Cited by 20 publications

(16 citation statements)

References 25 publications

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“…Thus, we did not use the thermal conductivity data in Bhatt and Gohil. 40 The reason why we did not use the data reported by Van Valkenburg et al 3 was explained in our previous work. 25 The AAD results are listed in Table 5 for both the training and testing sets (more details can be found in Supporting Information Table S5).…”

Section: Development Of the Methodsmentioning

confidence: 99%

“…Therefore, we took all the literature into account except two. 3,40 41 The thermal conductivities of the eight kinds of ILs are in the range of 0.381−0.954 W m −1 K −1 , which is extremely large since the thermal conductivities of most ILs are between 0.1000 and 0.2000 W m −1 K −1 . The error of the measurement of thermal conductivity mainly comes from the error in measurements of temperature.…”

Section: Development Of the Methodsmentioning

confidence: 99%

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Thermal Conductivity of Ionic Liquids at Atmospheric Pressure: Database, Analysis, and Prediction Using a Topological Index Method

Chen

2014

Ind. Eng. Chem. Res.

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Thermal conductivity is an important thermophysical property of ionic liquids (ILs). In this paper, a database for the thermal conductivity of ILs was established by collecting experimental data from literature covering the period from 2007 to 2013, including 359 data points, 45 ILs. The influences of temperature and the alkyl chain length of the cation on thermal conductivity were also discussed. A topological index method was proposed to estimate the thermal conductivity of ILs based on collected data which were divided into training (299 data points, 38 ILs) and testing (60 data points, 7 ILs) sets. The total average absolute deviation between the calculated and literature data was found to be 2.3%, with 2.1% for the training set and 2.9% for the testing set. The topological index method guarantees satisfactory precision with a simple form and can be easily expanded to new kinds of ILs.

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Section: Development Of the Methodsmentioning

confidence: 99%

Section: Development Of the Methodsmentioning

confidence: 99%

Thermal Conductivity of Ionic Liquids at Atmospheric Pressure: Database, Analysis, and Prediction Using a Topological Index Method

Chen

2014

Ind. Eng. Chem. Res.

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“…30 Many potential applications in materials and engineering such as heat transfer liquids, lubricants, fuels and electrolytes depend crucially on the fluidity of the IL, which is dependent on the H-bonding. [31][32][33][34][35] The ability to form mixtures of ILs and to combine ILs with polymers and other solvents has become increasingly important, and is a current area of intense activity. 36,37 The characteristics of mixtures formed with other liquids/solids such as methanol or ethylene glycol are heavily influenced by H-bonding interactions that take place.…”

Section: Ionic Liquidsmentioning

confidence: 99%

Hydrogen bonding in ionic liquids

2015

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Ionic liquids (IL) and hydrogen bonding (H-bonding) are two diverse fields for which there is a developing recognition of significant overlap. Doubly ionic H-bonds occur when a H-bond forms between a cation and anion, and are a key feature of ILs. Doubly ionic H-bonds represent a wide area of H-bonding which has yet to be fully recognised, characterised or explored. H-bonds in ILs (both protic and aprotic) are bifurcated and chelating, and unlike many molecular liquids a significant variety of distinct H-bonds are formed between different types and numbers of donor and acceptor sites within a given IL. Traditional more neutral H-bonds can also be formed in functionalised ILs, adding a further level of complexity. Ab initio computed parameters; association energies, partial charges, density descriptors as encompassed by the QTAIM methodology (ρBCP), qualitative molecular orbital theory and NBO analysis provide established and robust mechanisms for understanding and interpreting traditional neutral and ionic H-bonds. In this review the applicability and extension of these parameters to describe and quantify the doubly ionic H-bond has been explored. Estimating the H-bonding energy is difficult because at a fundamental level the H-bond and ionic interaction are coupled. The NBO and QTAIM methodologies, unlike the total energy, are local descriptors and therefore can be used to directly compare neutral, ionic and doubly ionic H-bonds. The charged nature of the ions influences the ionic characteristics of the H-bond and vice versa, in addition the close association of the ions leads to enhanced orbital overlap and covalent contributions. The charge on the ions raises the energy of the Ylp and lowers the energy of the X-H σ* NBOs resulting in greater charge transfer, strengthening the H-bond. Using this range of parameters and comparing doubly ionic H-bonds to more traditional neutral and ionic H-bonds it is clear that doubly ionic H-bonds cover the full range of weak through to very strong H-bonds.

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“…30 Ion exchange resins have been broadly used in wastewater treatment, and they have also been used as efficient adsorbents for the purication or recovery of ionic liquids in their synthesis and application. [31][32][33] However, few research works have been carried out on the adsorption of ILs by ion exchange resins from aqueous streams for the purpose of waste treatment. Sun et al evaluated the adsorption of 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) onto twelve different ion-exchange resins with different functional groups from aqueous solutions, and found that the uptake of [EMIM][OAc] was dependent on the types of the active groups on the resin, while the bead size and crosslinking degree was less important in the adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of imidazolium-based ionic liquids with different chemical structures onto various resins from aqueous solutions

Wang

2015

RSC Adv.

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Ion exchange synthesis and thermal characteristics of some [N+4444] based ionic liquids

Cited by 20 publications

References 25 publications

Thermal Conductivity of Ionic Liquids at Atmospheric Pressure: Database, Analysis, and Prediction Using a Topological Index Method

Thermal Conductivity of Ionic Liquids at Atmospheric Pressure: Database, Analysis, and Prediction Using a Topological Index Method

Hydrogen bonding in ionic liquids

Adsorption of imidazolium-based ionic liquids with different chemical structures onto various resins from aqueous solutions

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