Effects of confinement on the dielectric response of water extends up to mesoscale dimensions

Sergio De Luca, Sridhar Kumar Kannam, B.D. Todd, Federico Frascoli, Jesper Schmidt Hansen, Peter J. Daivis

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

The extent of confinement effects on water is not clear in the literature. While some properties are affected only within a few nanometers from the wall surface, others are affected over long length scales, but the range is not clear. In this work, we have examined the dielectric response of confined water under the influence of external electric fields along with the dipolar fluctuations at equilibrium. The confinement induces a strong anisotropic effect which is evident up to 100 nm channel width, and may extend to macroscopic dimensions. The root-mean-square fluctuations of the total orientational dipole moment in the direction perpendicular to the surfaces is 1 order of magnitude smaller than the value attained in the parallel direction and is independent of the channel width. Consequently, the isotropic condition is unlikely to be recovered until the channel width reaches macroscopic dimensions. Consistent with dipole moment fluctuations, the effect of confinement on the dielectric response also persists up to channel widths considerably beyond 100 nm. When an electric field is applied in the perpendicular direction, the orientational relaxation is 3 orders of magnitude faster than the dipolar relaxation in the parallel direction and independent of temperature.
OriginalsprogEngelsk
TidsskriftLangmuir
Vol/bind32
Udgave nummer19
Sider (fra-til)4765-4773
ISSN0743-7463
DOI
StatusUdgivet - 2016

Citer dette

De Luca, Sergio ; Kannam, Sridhar Kumar ; Todd, B.D. ; Frascoli, Federico ; Hansen, Jesper Schmidt ; Daivis, Peter J. / Effects of confinement on the dielectric response of water extends up to mesoscale dimensions. I: Langmuir. 2016 ; Bind 32, Nr. 19. s. 4765-4773.
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abstract = "The extent of confinement effects on water is not clear in the literature. While some properties are affected only within a few nanometers from the wall surface, others are affected over long length scales, but the range is not clear. In this work, we have examined the dielectric response of confined water under the influence of external electric fields along with the dipolar fluctuations at equilibrium. The confinement induces a strong anisotropic effect which is evident up to 100 nm channel width, and may extend to macroscopic dimensions. The root-mean-square fluctuations of the total orientational dipole moment in the direction perpendicular to the surfaces is 1 order of magnitude smaller than the value attained in the parallel direction and is independent of the channel width. Consequently, the isotropic condition is unlikely to be recovered until the channel width reaches macroscopic dimensions. Consistent with dipole moment fluctuations, the effect of confinement on the dielectric response also persists up to channel widths considerably beyond 100 nm. When an electric field is applied in the perpendicular direction, the orientational relaxation is 3 orders of magnitude faster than the dipolar relaxation in the parallel direction and independent of temperature.",
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Effects of confinement on the dielectric response of water extends up to mesoscale dimensions. / De Luca, Sergio; Kannam, Sridhar Kumar; Todd, B.D.; Frascoli, Federico; Hansen, Jesper Schmidt; Daivis, Peter J.

I: Langmuir, Bind 32, Nr. 19, 2016, s. 4765-4773.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Effects of confinement on the dielectric response of water extends up to mesoscale dimensions

AU - De Luca, Sergio

AU - Kannam, Sridhar Kumar

AU - Todd, B.D.

AU - Frascoli, Federico

AU - Hansen, Jesper Schmidt

AU - Daivis, Peter J.

PY - 2016

Y1 - 2016

N2 - The extent of confinement effects on water is not clear in the literature. While some properties are affected only within a few nanometers from the wall surface, others are affected over long length scales, but the range is not clear. In this work, we have examined the dielectric response of confined water under the influence of external electric fields along with the dipolar fluctuations at equilibrium. The confinement induces a strong anisotropic effect which is evident up to 100 nm channel width, and may extend to macroscopic dimensions. The root-mean-square fluctuations of the total orientational dipole moment in the direction perpendicular to the surfaces is 1 order of magnitude smaller than the value attained in the parallel direction and is independent of the channel width. Consequently, the isotropic condition is unlikely to be recovered until the channel width reaches macroscopic dimensions. Consistent with dipole moment fluctuations, the effect of confinement on the dielectric response also persists up to channel widths considerably beyond 100 nm. When an electric field is applied in the perpendicular direction, the orientational relaxation is 3 orders of magnitude faster than the dipolar relaxation in the parallel direction and independent of temperature.

AB - The extent of confinement effects on water is not clear in the literature. While some properties are affected only within a few nanometers from the wall surface, others are affected over long length scales, but the range is not clear. In this work, we have examined the dielectric response of confined water under the influence of external electric fields along with the dipolar fluctuations at equilibrium. The confinement induces a strong anisotropic effect which is evident up to 100 nm channel width, and may extend to macroscopic dimensions. The root-mean-square fluctuations of the total orientational dipole moment in the direction perpendicular to the surfaces is 1 order of magnitude smaller than the value attained in the parallel direction and is independent of the channel width. Consequently, the isotropic condition is unlikely to be recovered until the channel width reaches macroscopic dimensions. Consistent with dipole moment fluctuations, the effect of confinement on the dielectric response also persists up to channel widths considerably beyond 100 nm. When an electric field is applied in the perpendicular direction, the orientational relaxation is 3 orders of magnitude faster than the dipolar relaxation in the parallel direction and independent of temperature.

U2 - 10.1021/acs.langmuir.6b00791

DO - 10.1021/acs.langmuir.6b00791

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VL - 32

SP - 4765

EP - 4773

JO - Langmuir

JF - Langmuir

SN - 0743-7463

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