Collective dynamics of liquid acetone investigated by inelastic X-ray scattering

Hosokawa, Shinya; Kamiyama, Takashi; Yoshida, Kōji; Yamaguchi, Toshio; Tsutsui, Satoshi; Baron, Alfred Q. R.

doi:10.1016/j.molliq.2021.115825

Cited by 7 publications

(9 citation statements)

References 56 publications

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“…The thick dashed and solid lines indicate the hydrodynamic predictions obtained from the adiabatic sound velocities of 1322 m s −1 at 140 • C and 1275 m s −1 at 180 • C [56], respectively. As clearly seen in the figure, large positive deviations are observed in both the liquid phases, similarly to molecular liquids [37][38][39][40][41] but unlike liquid metals [42].…”

Section: Resultsmentioning

confidence: 60%

“…The sulphur sample was contained in a thin-walled (∼0.25 mm) single-crystal sapphire cell with the sample thickness of about 1 mm [45], which was shown in figure 2 of [37] and is a slight modification of the so-called Tamura-type cell [46]. The sapphire cell is inactive against the corrosive sulphur sample and almost transparent to hard x-rays.…”

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

“…The obtained IXS spectra were analysed by a GLF method with simple sparse modelling for the fitting parameters. Since the details of the data analysis were already presented in previous papers on molecular liquids [37,39,41], only a digest is given in this paper. The GLF analysis starts from an intermediate scattering function defined as…”

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

“…As seen in figure 1 of [39,41], the features of the IXS spectra, such as the height and width of quasielastic and phonon peaks as well as the phonon excitation energy, depend on many parameters, and thus, the parameters frequently interfere with one another, leading to scattered Q dependences, as shown in figure 3 of [40]. Since the fitting parameters are assumed to gradually change with Q, sparse modeling can be applied to data fitting as done for liquid acetone [37], CCl 4 [39], and benzene [41]. The analytical technique is called 'least absolute shrinkage and selection operator (LASSO)' proposed by Tibshirani [50].…”

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

“…We have interpreted IXS spectra of some molecular liquids, such as acetone [37], CCl 4 [38,39], and benzene [40,41]. These molecular liquids exhibit large positive deviations of sound velocity of about 55% as in the present liquid sulphur, which is much larger than those of liquid metals of 15%-20% [42].…”

Section: Introductionmentioning

confidence: 97%

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Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Hosokawa,

Katayama,

Tsutsui

et al. 2024

J. Phys.: Condens. Matter

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Inelastic x-ray scattering (IXS) experiments on liquid sulphur were carried out below (140◦C) and above (180◦C) the polymerisation temperature Tλ of about 159◦C to investigate changes in the collective dynamics of this unique liquid, that exhibits a liquid‒liquid transition. As reported earlier, broad longitudinal acoustic excitation signals were observed at both temperatures, and only the width of the quasielastic peaks slightly decreased when the temperature crossed the transition temperature. A model analysis was performed using a generalised Langevin formalism with a memory function having one thermal and two viscoelastic decay channels with the help of simple sparse modelling, and large positive deviations from the hydrodynamic sound velocity by 51‒54% were observed. The fast viscoelastic relaxation time τµis close to the correlation times of intermolecular stretching and bending motions of local sulphur connections in both ring and chain structures, and is similar to those of other molecular liquids. The small contrasts in the IXS spectra across the λ transition result in large changes in only the slow viscoelastic decay time τα of the memory function. The τα value at 140◦C matches the mixed internal/external torsional modes of S8 molecules well, whereas that at 180◦C has no corresponding molecular motion mode. The kinematic viscosity values at thesmaller than the minimum values of macroscopic shear viscosity, in⃗dicating that largeQ 0 limit are much changes in relaxation dynamics are expected with Q in the GHz and MHz excitation regimes.

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Section: Resultsmentioning

confidence: 60%

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Hosokawa,

Katayama,

Tsutsui

et al. 2024

J. Phys.: Condens. Matter

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Structure and Dynamics of Solutions Studied by X‐Ray and Neutron Scattering

Yamaguchi

2022

Encyclopedia of Analytical Chemistry

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X‐ray and neutron scattering techniques give us direct information of the microscopic structure (interatomic distance and coordination number) and dynamic properties (vibrational, translational, and rotational motions) of ions and solvents in solutions. Firstly, theoretical background in X‐ray and neutron scattering and empirical potential structure refinement modeling is described, followed by instrumentation of laboratory‐scale and synchrotron radiation X‐ray sources and pulsed neutron sources. Coherent X‐ray and neutron scattering methods of solutions are exemplified for the microscopic structure determination of ion solvation and solutions under pressure. Inelastic X‐ray and neutron scattering methods, such as quasi‐elastic neutron scattering and neutron spin‐echo methods, are described in theory and instrumentation. The dynamic properties of supercritical methanol and water confined in mesoporous materials are described. Finally, conclusions and perspectives are represented.

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A possible origin of the very fast sound in terahertz region in liquid benzene

Hosokawa,

Yoshida

2023

Journal of Molecular Liquids

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Collective dynamics of liquid acetone investigated by inelastic X-ray scattering

Cited by 7 publications

References 56 publications

Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Structure and Dynamics of Solutions Studied by X‐Ray and Neutron Scattering

A possible origin of the very fast sound in terahertz region in liquid benzene

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