High-pressure phase behavior of the room temperature ionic liquid 1-ethyl-3-methylimidazolium nitrate

Yoshimura, Yukihiro; Takekiyo, Takahiro; Abe, Hiroshi; Hamaya, Nozomu

doi:10.1016/j.molliq.2015.02.010

Cited by 20 publications

(12 citation statements)

References 28 publications

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“…In our previous contributions to the scientific community focused on high-pressure systems, − we confirmed that, depending on the combination of cation and anion, some ILs formed a superpressed liquid state (metastable glassy); however, some ILs crystallized under pressure. Moreover, as an alternative to pressure-induced crystallization, we determined that such a metastable liquid exhibited crystal polymorphism during the decompression process.…”

Section: Introductionsupporting

confidence: 74%

“…Moreover, as an alternative to pressure-induced crystallization, we determined that such a metastable liquid exhibited crystal polymorphism during the decompression process. The previously reported high-pressure behavior of ILs can be classified into, at least, four patterns: (1) pressure-induced crystallization, (2) superpressurized (glassy) state upon compression, − (3) decompression-induced crystallization from superpressurized glass, and (4) pressure-induced amorphous state from compression-induced crystallization …”

Section: Introductionmentioning

confidence: 99%

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Peculiar High-Pressure Phase Behavior of 1-Butyl-3-methylimidazolium Iodide

Takekiyo

Yoshimura

2020

J. Phys. Chem. B

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We investigated the stability of the liquid phase of 1butyl-3-methylimidazolium iodide (hereafter abbreviated as [C 4 mim]-[I]) up to 16.7 GPa at room temperature. We observed a peculiar phase transition behavior in the [C 4 mim][I] sample. In particular, a glassy state was formed at ∼1.3 GPa; however, the reddish-brown precipitate was formed probably due to concentrated I 3 − or I 2 − species that were formed above 12 GPa; [C 4 mim][I] showed a pressure-induced partial crystallization from the glassy state. We concluded that the conformation of [C 4 mim] + is essential in iterative modulation to control the environmental formation of iodide precipitate.

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Section: Introductionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Peculiar High-Pressure Phase Behavior of 1-Butyl-3-methylimidazolium Iodide

Takekiyo

Yoshimura

2020

J. Phys. Chem. B

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“…Phase transitions have been identified by various methods: a slope change of the pressure dependence of some vibrational wavenumbers; the broadening of the fluorescence lines emitted from the ruby spheres used for measuring pressure; the appearance of a frozen dynamics below 100 cm −1 , in the case of glass transition; and the change in the population of different conformers of ions . As to the latter method, most studies were performed on ILs containing imidazolium‐based cations, which possess isomers, and anions, which do not possess conformers, such as BF 4 , PF 6 , NO 3 , and TfO . Indeed, the alkyl chain attached to the imidazole ring has many flexible CC bonds, and, therefore, a large number of conformers are present in the ILs.…”

Section: Introductionmentioning

confidence: 99%

Pressurizing the mixtures of two ionic liquids: Crystallization versus vetrification

Capitani

Trequattrini

Palumbo³

et al. 2017

J Raman Spectroscopy

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A series of mixtures prepared with different content of the ionic liquids N‐trimethyl‐N‐propylammonium bis(trifluoromethylsulfonyl)imide (TMPA‐TFSI) and N‐trimethyl‐N‐hexylammonium bis(trifluoromethylsulfonyl)imide (TMHA‐TFSI), namely, (TMPA‐TFSI)100−x (TMHA‐TFSI)x, is investigated by means of Raman spectroscopy as a function of pressure at room temperature. Both pure TMPA‐TFSI and the x = 2 mixture crystallize under an applied pressure lower than 1 GPa. On the contrary, for x > 7, none of the investigated mixtures crystallize, but they undergo a glass transition over the 1–2 GPa pressure range. We suggest that the disorder induced by the high number of possible configurations for the longer alkyl chain of TMHA‐TFSI in a compressed environment is a key factor in the suppression of the crystallization process.

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“…[17] Essas diversas combinações geram assinaturas estruturais que implicam em modificações nos espectros vibracionais e seus padrões de espalhamento de raios-X, tanto por gerarem diferentes fases cristalinas, quanto fases amorfas distintas. [18]- [20] Implicavam também em diferentes comportamentos térmicos (evidenciados por calorimetria diferencial de varredura, DSC, e análise termogravimétrica, TGA) além das propriedades físico-químicas mencionadas anteriormente. Sendo que este conjunto de técnicas (Raman, infravermelho, difração de raios-X, DSC e TGA), além de ressonância magnética nuclear, são usualmente empregadas na caracterização de novos líquidos.…”

Section: Histórico E Propriedadesunclassified

“…Entretanto, uma particularidade dos líquidos iônicos é que estes sistemas possuem uma faixa ampla de temperaturas e pressões nas quais permanecem na fase líquida. [18]- [20], [22], [48] São valores típicos de temperatura (a pressão ambiente) da ordem de 180 K até temperaturas superiores a 500 K, sendo o limite inferior, normalmente, a temperatura de transição vítrea e o superior um valor típico para a temperatura de decomposição térmica. Para taxas de resfriamento típicas de 5 K por minuto ou maiores, estes sistemas são bons formadores de vidros.…”

Section: Histórico E Propriedadesunclassified

Dinâmica coletiva de líquidos iônicos

Paschoal¹

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In this work the structure and the collective dynamics of ionic liquids in their liquid and glassy phases in different points of their phase diagram was studied combining experimental and computational techniques. Starting from quantum chemistry calculations for force field parameter refinement, classical molecular dynamics simulations were performed, which allowed characterizing the structure of pure ionic liquids, as well as, their solutions with Li +. Furthermore, these systems optical and acoustic dispersion curves were obtained, as well as, relaxational parameters. Experimentally, techniques such as light and X-ray Brillouin scattering (performed at the University of Perugia and Advanced Photon Source, APS, respectively), X-ray diffraction (performed at the National Synchrotron Light Laboratory, LNLS) and Raman spectroscopy (performed at the Molecular Spectroscopy Laboratory, LEM) were employed to study these liquids. With these experiments, it was possible to study dynamical and structural properties of ionic liquids across their phase diagram (at low temperatures or high pressures). With the aid of Frenkel's phonon theory of liquids, it was possible to justify different dynamical aspects of the dynamics of liquids, ground on microscopic observations from either simulations or experiments. Furthermore, by employing this theory to the analysis of experimental data, it was possible to obtain a new perspective related to the glass transition process of the studied samples.

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High-pressure phase behavior of the room temperature ionic liquid 1-ethyl-3-methylimidazolium nitrate

Cited by 20 publications

References 28 publications

Peculiar High-Pressure Phase Behavior of 1-Butyl-3-methylimidazolium Iodide

Peculiar High-Pressure Phase Behavior of 1-Butyl-3-methylimidazolium Iodide

Pressurizing the mixtures of two ionic liquids: Crystallization versus vetrification

Dinâmica coletiva de líquidos iônicos

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