Glass Transition Temperature and Density Scaling in Cumene at Very High Pressure

Ransom, T. C.; Oliver, W. F.

doi:10.1103/physrevlett.119.025702

Cited by 24 publications

(22 citation statements)

References 47 publications

(48 reference statements)

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“…While the scaling exponent γ is allowed to vary, we observe that for cumene γ = 4.8 (Ref. 30) works well within the experimental uncertainty that we have to work with. The γ-value of cumene is fairly high, meaning that density plays a much larger role for the dynamics, as compared to the hydrogen-bonding liquid DPG, where the scaling exponent is just γ = 1.5 (Ref.…”

Section: Discussionsupporting

confidence: 71%

Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

Hansen

Frick

Capaccioli

et al. 2018

The Journal of Chemical Physics

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The relaxation dynamics in two van der Waals bonded and one hydrogen-bonding molecular liquids is studied as a function of pressure and temperature by incoherent neutron scattering using simultaneous dielectric spectroscopy. The dynamics is studied in a range of alpha relaxation times from nano-to milliseconds, primarily in the equilibrium liquid state. In this range we find that isochronal superposition and density scaling work not only for the two van der Waals liquids, but also for the hydrogen-bonding liquid, though the density scaling exponent is much smaller for the latter. Density scaling and isochronal superposition are seen to break down for intra-molecular dynamics when it is separated in time from the alpha relaxation in close agreement with previous observations from molecular dynamics simulations.

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Section: Discussionsupporting

confidence: 71%

Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

Hansen

Frick

Capaccioli

et al. 2018

The Journal of Chemical Physics

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“…This equation has been verified for a large number of materials by many different experimental groups. [20,21,22,23,24,25,26] Although the AA equation was originally introduced empirically, It has been also derived from theoretical models. [27,28] The dependence of the density from pressure and temperature is well described by the Tait equation of state (EoS) [29].…”

Section: Methodsmentioning

confidence: 99%

On the pressure dependence of the thermodynamical scaling exponent γ

Casalini

Ransom

2020

Soft Matter

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Since its initial discovery more than fifteen years ago, the thermodynamical scaling of the dynamics of supercooled liquids has been used to provide many new important insights in the physics of liquids, particularly on the link between dynamics and intermolecular potential. A question that has long been discussed is whether the scaling exponent  is a constant or it depends on pressure. Here we offer a simple method to determine the pressure dependence of  using only the pressure dependence of the glass transition and the equation of state.Using this new method we find that for the six non-associated liquids investigated  always decreases with increasing pressure. Importantly in all cases the value of  remains always larger than 4. Liquids having  closer to 4 at low pressure show a smaller change in  with pressure. We argue that this result has very important consequences for the experimental determination of the functional form of the repulsive part of the potential in liquids.

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“…13,27 On the other hand, in the literature we can also nd some evidence that it can be valid even up to 4.55 GPa (for cumene). 28 Apart from the high-pressure studies, a valuable source of information on the glass transition dynamics is the measurements carried out in conned geometry. It is well-established that the dynamics of the liquids conned to nanometer pores is much different from that in the bulk state.…”

Section: Introductionmentioning

confidence: 99%

Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol

2019

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Glass Transition Temperature and Density Scaling in Cumene at Very High Pressure

Cited by 24 publications

References 47 publications

Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

Isochronal superposition and density scaling of the α-relaxation from pico- to millisecond

On the pressure dependence of the thermodynamical scaling exponent γ

Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol

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