Dynamics of water in NaxCoO2·yH2O

Niina Jalarvo; Heloisa N. Bordallo; Nadir Aliouane; Mark A. Adams; Jörg Pieper; Dimitri N. Argyriou

doi:10.1021/jp074398y

Dynamics of water in Na_xCoO₂·yH₂O

Niina Jalarvo, Heloisa N. Bordallo^*, Nadir Aliouane, Mark A. Adams, Jörg Pieper, Dimitri N. Argyriou

^*Corresponding author af dette arbejde

5 Citationer (Scopus)

Abstract

Incoherent inelastic neutron scattering experiments were performed on Na_0.7CoO₂ and Na_0.28CoO₂·1. 3H₂O in order to understand how the dynamics of the hydrogen-bond network of water is modified in the triangular crystalline lattice Na _xCoO₂·yH₂O. Using quasi-elastic neutron scattering (QENS), we were able to differentiate between two types of proton dynamics: a fast process (due to water strongly bound into the sodium cobalt oxyhydrate structure during the hydration process) and a slow process (likely attributable to a collective motion). High-resolution QENS experiments, carried out on Na_0.28CoO₂·1.3H₂O, show that, at temperatures above 310 K, the water dynamics can be well-described by a random jump diffusion model characterized by a diffusion constant equal to 0.9 × 10^-9m²/ s, which is significantly lower than the rate of diffusion for bulk water. Furthermore, our results indicate that, at room temperature, the sodium ions have no influence on the rotational dynamics of the "fast" water molecules.

Originalsprog	Engelsk
Tidsskrift	Journal of Physical Chemistry B
Vol/bind	112
Udgave nummer	3
Sider (fra-til)	703-709
Antal sider	7
ISSN	1520-6106
DOI	https://doi.org/10.1021/jp074398y
Status	Udgivet - 24 jan. 2008
Udgivet eksternt	Ja

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10.1021/jp074398y

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Citationsformater

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title = "Dynamics of water in NaxCoO2·yH2O",

abstract = "Incoherent inelastic neutron scattering experiments were performed on Na0.7CoO2 and Na0.28CoO2·1. 3H2O in order to understand how the dynamics of the hydrogen-bond network of water is modified in the triangular crystalline lattice Na xCoO2·yH2O. Using quasi-elastic neutron scattering (QENS), we were able to differentiate between two types of proton dynamics: a fast process (due to water strongly bound into the sodium cobalt oxyhydrate structure during the hydration process) and a slow process (likely attributable to a collective motion). High-resolution QENS experiments, carried out on Na0.28CoO2·1.3H2O, show that, at temperatures above 310 K, the water dynamics can be well-described by a random jump diffusion model characterized by a diffusion constant equal to 0.9 × 10-9m2/ s, which is significantly lower than the rate of diffusion for bulk water. Furthermore, our results indicate that, at room temperature, the sodium ions have no influence on the rotational dynamics of the {"}fast{"} water molecules.",

author = "Niina Jalarvo and Bordallo, {Heloisa N.} and Nadir Aliouane and Adams, {Mark A.} and J{\"o}rg Pieper and Argyriou, {Dimitri N.}",

year = "2008",

month = jan,

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doi = "10.1021/jp074398y",

language = "English",

volume = "112",

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journal = "Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical",

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TY - JOUR

T1 - Dynamics of water in NaxCoO2·yH2O

AU - Jalarvo, Niina

AU - Bordallo, Heloisa N.

AU - Aliouane, Nadir

AU - Adams, Mark A.

AU - Pieper, Jörg

AU - Argyriou, Dimitri N.

PY - 2008/1/24

Y1 - 2008/1/24

N2 - Incoherent inelastic neutron scattering experiments were performed on Na0.7CoO2 and Na0.28CoO2·1. 3H2O in order to understand how the dynamics of the hydrogen-bond network of water is modified in the triangular crystalline lattice Na xCoO2·yH2O. Using quasi-elastic neutron scattering (QENS), we were able to differentiate between two types of proton dynamics: a fast process (due to water strongly bound into the sodium cobalt oxyhydrate structure during the hydration process) and a slow process (likely attributable to a collective motion). High-resolution QENS experiments, carried out on Na0.28CoO2·1.3H2O, show that, at temperatures above 310 K, the water dynamics can be well-described by a random jump diffusion model characterized by a diffusion constant equal to 0.9 × 10-9m2/ s, which is significantly lower than the rate of diffusion for bulk water. Furthermore, our results indicate that, at room temperature, the sodium ions have no influence on the rotational dynamics of the "fast" water molecules.

AB - Incoherent inelastic neutron scattering experiments were performed on Na0.7CoO2 and Na0.28CoO2·1. 3H2O in order to understand how the dynamics of the hydrogen-bond network of water is modified in the triangular crystalline lattice Na xCoO2·yH2O. Using quasi-elastic neutron scattering (QENS), we were able to differentiate between two types of proton dynamics: a fast process (due to water strongly bound into the sodium cobalt oxyhydrate structure during the hydration process) and a slow process (likely attributable to a collective motion). High-resolution QENS experiments, carried out on Na0.28CoO2·1.3H2O, show that, at temperatures above 310 K, the water dynamics can be well-described by a random jump diffusion model characterized by a diffusion constant equal to 0.9 × 10-9m2/ s, which is significantly lower than the rate of diffusion for bulk water. Furthermore, our results indicate that, at room temperature, the sodium ions have no influence on the rotational dynamics of the "fast" water molecules.

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DO - 10.1021/jp074398y

M3 - Journal article

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SN - 1520-6106

VL - 112

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JO - Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical

JF - Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical

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