Communication: Two measures of isochronal superposition

Roed, Lisa Anita; Gundermann, Ditte; Dyre, Jeppe C.; Niss, Kristine

doi:10.1063/1.4821163

Cited by 44 publications

(42 citation statements)

References 27 publications

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“…Extensive computer simulations have shown [15,[17][18][19][20][21][25][26][27][28][29][30], however, that the predicted isomorph invariants apply to a good approximation for a wide variety of systems. A few experimental predictions of the isomorph theory have been confirmed, as well [29,31,32]. This paper first discusses the case of general Roskilde-simple liquids, including mixtures [21,28,30] and molecular systems [17].…”

Section: Introductionmentioning

confidence: 99%

Isomorphs, hidden scale invariance, and quasiuniversality

Dyre

2013

Phys. Rev. E

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This paper first establishes an approximate scaling property of the potential-energy function of a classical liquid with good isomorphs (a Roskilde-simple liquid). This "pseudohomogeneous" property makes explicit that -and in which sense -such a system has a hidden scale invariance. The second part gives a potential-energy formulation of the quasiuniversality of monatomic Roskilde-simple liquids, which was recently rationalized in terms of the existence of a quasiuniversal single-parameter family of reduced-coordinate constant-potential-energy hypersurfaces [J. C. Dyre, Phys. Rev. E 87, 022106 (2013)]. The new formulation involves a quasiuniversal reduced-coordinate potential-energy function. A few consequences of this are discussed.

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Section: Introductionmentioning

confidence: 99%

Isomorphs, hidden scale invariance, and quasiuniversality

Dyre

2013

Phys. Rev. E

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“…The glass-formers community has widely exploited the imaginary part of the complex dielectric permittivity because of its high sensitivity to external factors such as temperature and pressure, and also to microscopic properties of the substance such as its degree of order, physical interactions with the surroundings, and geometrical confinement among others [7][8][9][10][11][12][13] . Glycerol (propane-1,2,3-triol) is one of the most studied molecular glass-formers, principally for its extremely low tendency to crystallize [14][15][16][17][18][19][20] . Since glycerol normally forms a highly stable supercooled liquid (large viscosity upon melting 17 ), little attention has been paid to its crystalline phase.…”

Section: Introductionmentioning

confidence: 99%

Liquid dynamics in partially crystalline glycerol

Sanz

Niss

2017

The Journal of Chemical Physics

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We present a dielectric study on the dynamics of supercooled glycerol during crystallization. We explore the transformation into a solid phase in real time by monitoring the temporal evolution of the amplitude of the dielectric signal. Neither the initial nucleation or the crystal growth influence the liquid dynamics visibly. For one of the samples studied, a tiny fraction of glycerol remained in the disordered state after the end of the transition. We examined the nature of the α relaxation in this frustrated crystal and find that it is virtually identical to the bulk dynamics. In addition, we have found no evidence that supercooled glycerol transforms into a peculiar phase in which either a new solid amorphous state or nano-crystals dispersed in a liquid matrix are formed.

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“…For comparison, we have included the shear-mechanical data from Refs. 23 and 47 for 2-ethyl-1-hexanol and polyphenyl ether (5PPE) which represent two limiting cases, i.e., a strongly hydrogen bonding liquid and a van der Waals bonded simple Roskilde-type 51,52 liquid. In Fig.…”

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confidence: 99%

Communication: Slow supramolecular mode in amine and thiol derivatives of 2-ethyl-1-hexanol revealed by combined dielectric and shear-mechanical studies

Adrjanowicz

Jakobsen

Hecksher

et al. 2015

The Journal of Chemical Physics

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In this paper, we present results of dielectric and shear-mechanical studies for amine (2-ethyl-1-hexylamine) and thiol (2-ethyl-1-hexanethiol) derivatives of the monohydroxy alcohol, 2-ethyl-1-hexanol. The amine and thiol can form hydrogen bonds weaker in strength than those of the alcohol. The combination of dielectric and shear-mechanical data enables us to reveal the presence of a relaxation mode slower than the α-relaxation. This mode is analogous to the Debye mode seen in monohydroxy alcohols and demonstrates that supramolecular structures are present for systems with lower hydrogen bonding strength. We report some key features accompanying the decrease in the strength of the hydrogen bonding interactions on the relaxation dynamics close to the glass-transition. This includes changes (i) in the amplitude of the Debye and α-relaxations and (ii) the separation between primary and secondary modes.

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Communication: Two measures of isochronal superposition

Cited by 44 publications

References 27 publications

Isomorphs, hidden scale invariance, and quasiuniversality

Isomorphs, hidden scale invariance, and quasiuniversality

Liquid dynamics in partially crystalline glycerol

Communication: Slow supramolecular mode in amine and thiol derivatives of 2-ethyl-1-hexanol revealed by combined dielectric and shear-mechanical studies

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