Volume viscosity and ultrasonic relaxation of ethanol–water mixtures studied by molecular dynamics simulations

Yamaguchi, Tsuyoshi

doi:10.1039/d2cp00856d

Phys. Chem. Chem. Phys.

2022

DOI: 10.1039/d2cp00856d

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Volume viscosity and ultrasonic relaxation of ethanol–water mixtures studied by molecular dynamics simulations

Tsuyoshi Yamaguchi

Abstract: The volume viscosity of ethanol water mixtures at various compositions were calculated by means of equilibrium molecular dynamics simulation, and the results were compared with acoustic experiments. The volume viscosity...

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Cited by 4 publications

References 32 publications

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Enhanced Self–Assembly and Spontaneous Separation for Ultrathin, Air‒Floating Graphene Macrofilms and their Application in Ultrasensitive In‐Site Growth Sensors

Ding,

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et al. 2024

Advanced Materials

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Self‐assembled graphene films at air‐liquid interface have great potential for multiple applications. However, the large size and ultrathin thickness for graphene‐based films are hardly achieved simultaneously because of poor assembly ability of graphene oxide (GO) and cautious film transfer process (FTP). Herein, the ethanol‐based binary solution with supramolecular clusters and weak polarity is introduced to enhance the assembly performance of GO. In this regime, GO film is formed within 52 s, and its formation temperature can be as low as −20 °C. More importantly, the attractive force between the formed GO film and this binary solution is 62% lower than that between GO film and traditional aqueous solution. On this basis, for the first time a spontaneous separation of the self‐assembled GO film from solution is reported, and the air‒floating graphene films (AGFs) with nanoscale thickness and centimeter‐scale diameter are prepared without FTP. By means of this separation behavior, the in situ growth AGFs sensors are fabricated, and they express fast response and ultrahigh sensitivity to imperceptible change in temperature and disturbances that are hardly recognized by common sensors. Therefore, a new accessible strategy is demonstrated to prepare ultrathin graphene macrofilms, which can be the excellent candidates for multifunctional, ultrasensitive sensors.

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Enhanced Self–Assembly and Spontaneous Separation for Ultrathin, Air‒Floating Graphene Macrofilms and their Application in Ultrasensitive In‐Site Growth Sensors

Ding,

Yang,

Chen

et al. 2024

Advanced Materials

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Metal recovery from industrial solid waste by ultrasonic-assisted hydrometallurgical leaching: a review

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Li,

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et al. 2024

Environ Chem Lett

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Comparison between longitudinal viscoelastic relaxation and sound dispersion of molecular liquids on the molecular scale

Yamaguchi

2022

The Journal of Chemical Physics

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Molecular dynamics simulation on some molecular liquids was performed to study sound dispersion on the molecular scale. The sound velocity was determined from the intermediate scattering function, and the relation between longitudinal modulus and frequency was compared with the frequency-dependent longitudinal modulus in the q = 0 limit evaluated by the Kubo-Green theory. The sound dispersion of a monoatomic liquid up to qσ ≅ 2 was almost quantitatively explained by the viscoelasticity in the q = 0 limit when the wavenumber dependence of the heat capacity ratio was taken into account. The situation was similar for a polyatomic molecular liquid for which the intramolecular degrees of freedom were fixed. For a polyatomic liquid with intramolecular degrees of freedom, the sound dispersion on the molecular scale was connected to the high-frequency limit of the ultrasonic relaxation mode assigned to the vibrational energy relaxation. After subtracting the contribution of the vibrational energy relaxation, both the longitudinal viscoelasticity and the sound dispersion depended little on the presence of intramolecular degrees of freedom.

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Volume viscosity and ultrasonic relaxation of ethanol–water mixtures studied by molecular dynamics simulations

Abstract: The volume viscosity of ethanol water mixtures at various compositions were calculated by means of equilibrium molecular dynamics simulation, and the results were compared with acoustic experiments. The volume viscosity...

Cited by 4 publications

References 32 publications

Enhanced Self–Assembly and Spontaneous Separation for Ultrathin, Air‒Floating Graphene Macrofilms and their Application in Ultrasensitive In‐Site Growth Sensors

Enhanced Self–Assembly and Spontaneous Separation for Ultrathin, Air‒Floating Graphene Macrofilms and their Application in Ultrasensitive In‐Site Growth Sensors

Metal recovery from industrial solid waste by ultrasonic-assisted hydrometallurgical leaching: a review

Comparison between longitudinal viscoelastic relaxation and sound dispersion of molecular liquids on the molecular scale

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