Dynamics of water intercalation fronts in a nano-layered synthetic silicate: A synchrotron X-ray scattering study

We performed synchrotron X-ray scattering studies of the dynamics of the water intercalation front in a Na–Fluorohectorite clay. Like other smectite clays, fluorohectorite particles can swell due to intercalation of successive water layers. Monitoring the intensities of Bragg peaks of the known 1- a...

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Published in:Physica. B, Condensed matter Condensed matter, 2005-12, Vol.370 (1), p.90-98
Main Authors: Løvoll, G., Sandnes, B., Méheust, Y., Måløy, K.J., Fossum, J.O., da Silva, G.J., Mundim, M.S.P., Droppa Jr, R., Fonseca, D.M.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Clay
Diffusion
Exact sciences and technology
Nano-layered materials
Water intercalation
WAXS
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cited_by cdi_FETCH-LOGICAL-c430t-1d5b44f8bbee084f6fbc14485e09b378f2beb9a239fed1458c1b3544f37983703
cites cdi_FETCH-LOGICAL-c430t-1d5b44f8bbee084f6fbc14485e09b378f2beb9a239fed1458c1b3544f37983703
container_end_page 98
container_issue 1
container_start_page 90
container_title Physica. B, Condensed matter
container_volume 370
creator Løvoll, G.
Sandnes, B.
Méheust, Y.
Måløy, K.J.
Fossum, J.O.
da Silva, G.J.
Mundim, M.S.P.
Droppa Jr, R.
Fonseca, D.M.
description We performed synchrotron X-ray scattering studies of the dynamics of the water intercalation front in a Na–Fluorohectorite clay. Like other smectite clays, fluorohectorite particles can swell due to intercalation of successive water layers. Monitoring the intensities of Bragg peaks of the known 1- and 2-water-layer hydration states at different positions in the sample enabled spatial and temporal measurement of the proportions of the different hydration states. From experiments with controlled temperature and an imposed humidity gradient on a quasi one-dimensional powder sample, we were able to localize the intercalation front and demonstrate that the width of this front was smaller than 2 mm after penetrating 9 mm into the sample. The speed at which the intercalation front advanced through the sample during the diffusion process was shown to decrease with time. The diffraction signature of random water intercalation in the vicinity of the intercalation front also provided information on the changes in the water content of the mesopores around clay particles.
doi_str_mv 10.1016/j.physb.2005.09.026
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subjects Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Clay
Diffusion
Exact sciences and technology
Nano-layered materials
Water intercalation
WAXS
title Dynamics of water intercalation fronts in a nano-layered synthetic silicate: A synchrotron X-ray scattering study
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