Fragility of ionic liquids measured by Flash differential scanning calorimetry

Tao, Ran; Gurung, Eshan; Cetin, M. Mustafa; Mayer, M.; Quitevis, Edward L.; Simon, Sindee L.

doi:10.1016/j.tca.2017.05.008

Cited by 35 publications

(52 citation statements)

References 73 publications

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“…These are relatively large values for the fragility index and reflect some degree of fragility in this class of compounds [the larger m, the more fragile is the compound, according to the definition proposed by Angell (1985, 1991), Böhmer and Angell (1992), Böhmer et al (1993). The trend toward decreasing fragility (m) upon increasing alkyl chain length in ILs has been shown elsewhere, e.g., Sippel et al (2015), Leys et al (2008), Tao et al (2017), where m values for a series of [C n mim]-based ILs with [BF 4 ] and [PF 6 ] anions have been reported and its relevance for energy applications highlighted.…”

Section: Resultsmentioning

confidence: 58%

Microscopic Structural and Dynamic Features in Triphilic Room Temperature Ionic Liquids

et al. 2019

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Here we report a thorough investigation of the microscopic and mesoscopic structural organization in a series of triphilic fluorinated room temperature ionic liquids, namely [1-alkyl,3-methylimidazolium][(trifluoromethanesulfonyl)(nonafluorobutylsulfonyl)imide], with alkyl = ethyl, butyl, octyl ([C n mim][IM 14 ], n = 2, 4, 8), based on the synergic exploitation of X-ray and Neutron Scattering and Molecular Dynamics simulations. This study reveals the strong complementarity between X-ray/neutron scattering in detecting the complex segregated morphology in these systems at mesoscopic spatial scales. The use of MD simulations delivering a very good agreement with experimental data allows us to gain a robust understanding of the segregated morphology. The structural scenario is completed with determination of dynamic properties accessing the diffusive behavior and a relaxation map is provided for [C 2 mim][IM 14 ] and [C 8 mim][IM 14 ], highlighting their natures as fragile glass formers.

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Section: Resultsmentioning

confidence: 58%

Microscopic Structural and Dynamic Features in Triphilic Room Temperature Ionic Liquids

et al. 2019

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“…To determine

, we compared the difference of the heat capacity of the liquid and glassy states using the area matching method established by Moynihan et al ( 31 ) for fast cooling rates and an extrapolation method for slow cooling rates, for which we observe that

lies below the onset of devitrification ( Fig. 3B ; see Materials and Methods for details) ( 32 , 33 ). For the ABC ternary mixture, for instance, we observe that

increases from −26° to −7.5°C as q changes from −0.1 to −1000 K s −1 ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Vitrification of octonary perylene mixtures with ultralow fragility

et al. 2021

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Strong glass formers with a low fragility are highly sought-after because of the technological importance of vitrification. In the case of organic molecules and polymers, the lowest fragility values have been reported for single-component materials. Here, we establish that mixing of organic molecules can result in a marked reduction in fragility. Individual bay-substituted perylene derivatives display a high fragility of more than 70. Instead, slowly cooled perylene mixtures with more than three components undergo a liquid-liquid transition and turn into a strong glass former. Octonary perylene mixtures display a fragility of 13 ± 2, which not only is a record low value for organic molecules but also lies below values reported for the strongest known inorganic glass formers. Our work opens an avenue for the design of ultrastrong organic glass formers, which can be anticipated to find use in pharmaceutical science and organic electronics.

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“…Glass transitions do not occur at a specified fixed temperature as they are not first-order changes (Brandrup et al, 1999), and are kinetically dependent. The dependence of Tg of ILs on the scan rate has thoroughly been investigated (Goḿez et al, 2013; Tao et al, 2017).…”

Section: Ils As Glass Forming Materialsmentioning

confidence: 99%

Anomalous and Not-So-Common Behavior in Common Ionic Liquids and Ionic Liquid-Containing Systems

et al. 2019

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This work highlights unexpected, not so well known responses of ionic liquids and ionic liquid-containing systems, which are reported in a collective manner, as a short review. Examples include: (i) Minima in the temperature dependence of the isobaric thermal expansion coefficient of some ILs; (ii) Viscosity Minima in binary mixtures of IL + Molecular solvents; (iii) Anomalies in the surface tension within a family of ILs; (iv) The constancy among IL substitution of C p /V m at and around room temperature; (v) ILs as glass forming liquids; (vi) Alternate odd-even side alkyl chain length effects; (vii) Absolute negative pressures in ILs and IL-containing systems; (viii) Reversed-charged ionic liquid pairs; (ix) LCST immiscibility behavior in IL + solvent systems.

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Fragility of ionic liquids measured by Flash differential scanning calorimetry

Cited by 35 publications

References 73 publications

Microscopic Structural and Dynamic Features in Triphilic Room Temperature Ionic Liquids

Microscopic Structural and Dynamic Features in Triphilic Room Temperature Ionic Liquids

Vitrification of octonary perylene mixtures with ultralow fragility

Anomalous and Not-So-Common Behavior in Common Ionic Liquids and Ionic Liquid-Containing Systems

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