Local correlated motions in aqueous solution of sodium chloride

Shinohara, Yuya; Dmowski, Wojciech; Iwashita, Takuya; Ishikawa, Daisuke; Baron, Alfred Q. R.; Egami, T.

doi:10.1103/physrevmaterials.3.065604

Cited by 20 publications

(23 citation statements)

References 45 publications

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“…15 Because of the exceptionally large incoherent scattering cross section of hydrogen atoms, it has mostly been employed to investigate the single-particle dynamics. 16 However, using deuterated materials it is possible to study the collective dynamics of materials, i. which has been recently indicated to be of fundamental significance, 17,18 providing insights on the lifetime of structural organization, as for example, noticeably, hydrogen bond networks. 19 Such insights are generally, albeit with notable exceptions, 17 not available from other scattering techniques which lack the opportune spatial (e.g., light scattering) or temporal (e.g., X-ray scattering) resolution.…”

mentioning

confidence: 99%

Influence of Kosmotrope and Chaotrope Salts on Water Structural Relaxation

Luo

Zhang

Şenses

et al. 2020

J. Phys. Chem. Lett.

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The structural relaxation in water solutions of kosmotrope (structure maker) and chaotrope (structure breaker) salts, namely sodium chloride, potassium chloride, and cesium chloride, were studied through quasielastic neutron scattering measurements. We found that the collective dynamics relaxation time at the structure factor peak obtained using heavy water solutions shows a distinctively different behavior in the kosmotrope as opposed to the chaotrope solutions, increasing with the salt concentration in the former and decreasing in the latter. In both cases the trends are proportional to the concentration dependence of the relative viscosity of the solutions. These results indicate that kosmotropes and chaotropes influence the solution's viscosity by impacting in opposite ways the hydrogen bond network of water, strengthening it in one case and softening it in the other.

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confidence: 99%

Influence of Kosmotrope and Chaotrope Salts on Water Structural Relaxation

Luo

Zhang

Şenses

et al. 2020

J. Phys. Chem. Lett.

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“…To go beyond this limit, we have to resort either to neutron scattering which offers better energy resolution or to develop the method of X-ray photon correlation spectroscopy (XPCS) with free-electron X-ray laser [26]. At the 12)) [25].…”

Section: Limitations Of the Methodsmentioning

confidence: 99%

“…Therefore it is important to know how salt affects the properties of 0 and R 1 00 ) was used to calculate the area, A(t), of the first neighbor. The upper limit of this range is changed within the gray-shaded area to estimate the uncertainties [25].…”

Section: Van Hove Function Of Salty Watermentioning

confidence: 99%

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Atomic Dynamics in Real Space and Time

Egami¹

2020

Inelastic X-Ray Scattering and X-Ray Powder Diffraction Applications

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Atomic and molecular dynamics in strongly disordered matter, such as liquid, cannot be fully described in terms of phonons, because they are marginalized and often overdamped. Their dynamic and transport properties depend on local atomic rearrangements which are strongly correlated. To describe such local dynamics, the usual representation in momentum (Q) and energy (E) space in terms of the dynamic structure factor, S(Q, E), is not effective. We discuss an alternative approach in real space (r) and time (t), with the van Hove function, G(r, t), and show how this approach facilitates understanding of real-space local dynamics of liquids and other disordered systems in the length scale of Å and time scale of picosecond.

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“…G ( R , t ) is directly related to an intermediate scattering function, F ( Q , t ), and the dynamic structure functions, S ( Q , E ), via the Fourier transformation; thus, the quasi-elastic and inelastic scattering of X-ray and neutron can be used to obtain the VHF experimentally if the Fourier transform can be reliably carried out. Thanks to the recent progress in high-resolution inelastic X-ray scattering (IXS), , the VHF can be determined experimentally, being utilized to identify correlated motions in liquids. − This technique has shown the relationship between the decay behavior of the first neighboring peak and macroscopic viscosity in pure water. , Furthermore, it has shown the slowing-down of the local correlated dynamics of water in the hydration shells around Cl – ions in the aqueous solution of sodium chloride . Still, there remained uncertainty about the detailed water–ion correlated motions owing to the intrinsic broad width of the correlation profiles.…”

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confidence: 99%

Identifying Water–Anion Correlated Motion in Aqueous Solutions through Van Hove Functions

Shinohara

Matsumoto

Thompson

et al. 2019

J. Phys. Chem. Lett.

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Electrolyte solutions are ubiquitous in materials in daily use and in biological systems. However, the understanding of their molecular and ionic dynamics, particularly those of their correlated motions, are elusive despite extensive experimental, theoretical, and numerical studies. Here we report the real-space observations of the molecular/ionic-correlated dynamics of aqueous salt (NaCl, NaBr, and NaI) solutions using the Van Hove functions obtained by high-resolution inelastic X-ray scattering measurement and molecular dynamics simulation. Our results directly depict the distance-dependent dynamics of aqueous salt solutions on the picosecond time scale and identify the changes in the anion−water correlations. This study demonstrates the capability of the real-space Van Hove function analysis to describe the local correlated dynamics in aqueous salt solutions.

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Local correlated motions in aqueous solution of sodium chloride

Cited by 20 publications

References 45 publications

Influence of Kosmotrope and Chaotrope Salts on Water Structural Relaxation

Influence of Kosmotrope and Chaotrope Salts on Water Structural Relaxation

Atomic Dynamics in Real Space and Time

Identifying Water–Anion Correlated Motion in Aqueous Solutions through Van Hove Functions

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