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Impact of hierarchical water dipole orderings on the dynamics of aqueous salt solutions.

ABSTRACT: Ions exhibit highly ion-specific complex behaviours when solvated in water, which remains a mystery despite the fundamental importance of ion solvation in nature, science, and technology. Here we explain these ion-specific properties by the ion-induced hierarchical dipolar, translational, and bond-orientational orderings of ion hydration shell under the competition between ion-water electrostatic interactions and inter-water hydrogen bonding. We first characterise this competition by a new length λ_HB(q), explaining the ion-specific effects on solution dynamics. Then, by continuously tuning ion size and charge, we find that the bond-orientational order of the ion hydration shell highly develops for specific ion size and charge combinations. This ordering drastically stabilises the hydration shell; its degree changes the water residence time around ions by 11 orders of magnitude for main-group ions. These findings are fundamental to ionic processes in aqueous solutions, providing a physical principle for electrolyte design and application.

SUBMITTER: Shi R

PROVIDER: S-EPMC10406952 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature

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Impact of hierarchical water dipole orderings on the dynamics of aqueous salt solutions.

Shi Rui R Cooper Anthony J AJ Tanaka Hajime H

Nature communications 20230807 1

Ions exhibit highly ion-specific complex behaviours when solvated in water, which remains a mystery despite the fundamental importance of ion solvation in nature, science, and technology. Here we explain these ion-specific properties by the ion-induced hierarchical dipolar, translational, and bond-orientational orderings of ion hydration shell under the competition between ion-water electrostatic interactions and inter-water hydrogen bonding. We first characterise this competition by a new lengt ...[more]

PMID: 37550299

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Dataset Information

Impact of hierarchical water dipole orderings on the dynamics of aqueous salt solutions.

Publications

Impact of hierarchical water dipole orderings on the dynamics of aqueous salt solutions.

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