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 for this work

5 Citations (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.

Original language	English
Journal	Journal of Physical Chemistry B
Volume	112
Issue number	3
Pages (from-to)	703-709
Number of pages	7
ISSN	1520-6106
DOIs	https://doi.org/10.1021/jp074398y
Publication status	Published - 24 Jan 2008
Externally published	Yes

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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",

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doi = "10.1021/jp074398y",

language = "English",

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issn = "1520-6106",

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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

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SN - 1520-6106

VL - 112

SP - 703

EP - 709

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

IS - 3

ER -

Dynamics of water in Na_xCoO₂·yH₂O

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