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Swelling transition of a clay induced by heating

Hansen, Elisabeth; Hemmen, Henrik Hemmen; Fonseca, Davi; Coutant, C; Knudsen, K. D.; Plivelic, Tomás LU and Bonn, D. (2012) In Scientific Reports 2.
Abstract
Clays are of paramount importance for soil stability, but also in applications ranging from oil recovery to composites and hydrogels. Generically, clays are divided into two subclasses: macroscopically swelling, ‘active’ clays that have the capacity for taking up large amounts of water to form stable gels, and ‘passive’ or non-swelling clays; the former stabilize soils whereas the latter are known to lead to landslides. However, it has been unclear so far what mechanisms underlie clay swelling. Here, we report the first observation of a temperature-induced transition from a passive to an active, swelling clay. We propose a simple description of the swelling transition; while net attractive interactions are dominant at low temperatures so... (More)
Clays are of paramount importance for soil stability, but also in applications ranging from oil recovery to composites and hydrogels. Generically, clays are divided into two subclasses: macroscopically swelling, ‘active’ clays that have the capacity for taking up large amounts of water to form stable gels, and ‘passive’ or non-swelling clays; the former stabilize soils whereas the latter are known to lead to landslides. However, it has been unclear so far what mechanisms underlie clay swelling. Here, we report the first observation of a temperature-induced transition from a passive to an active, swelling clay. We propose a simple description of the swelling transition; while net attractive interactions are dominant at low temperatures so that the clay particles remain attached to each other in stacks, at higher temperatures it is energetically favourable for the clay to swell due to the entropy that is gained by counterions which are liberated during swelling. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
clays, swelling, X-ray scattering, Rheology
in
Scientific Reports
volume
2
publisher
Nature Publishing Group
external identifiers
  • wos:000308427800003
  • scopus:84866093379
ISSN
2045-2322
DOI
10.1038/srep00618
language
English
LU publication?
yes
id
2081416d-2cd7-4f66-b6d1-906a5dc2123c (old id 3048215)
date added to LUP
2012-09-04 11:24:45
date last changed
2017-07-23 04:06:21
@article{2081416d-2cd7-4f66-b6d1-906a5dc2123c,
  abstract     = {Clays are of paramount importance for soil stability, but also in applications ranging from oil recovery to composites and hydrogels. Generically, clays are divided into two subclasses: macroscopically swelling, ‘active’ clays that have the capacity for taking up large amounts of water to form stable gels, and ‘passive’ or non-swelling clays; the former stabilize soils whereas the latter are known to lead to landslides. However, it has been unclear so far what mechanisms underlie clay swelling. Here, we report the first observation of a temperature-induced transition from a passive to an active, swelling clay. We propose a simple description of the swelling transition; while net attractive interactions are dominant at low temperatures so that the clay particles remain attached to each other in stacks, at higher temperatures it is energetically favourable for the clay to swell due to the entropy that is gained by counterions which are liberated during swelling.},
  author       = {Hansen, Elisabeth and Hemmen, Henrik Hemmen and Fonseca, Davi and Coutant, C and Knudsen, K. D. and Plivelic, Tomás and Bonn, D.},
  issn         = {2045-2322},
  keyword      = {clays,swelling,X-ray scattering,Rheology},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Swelling transition of a clay induced by heating},
  url          = {http://dx.doi.org/10.1038/srep00618},
  volume       = {2},
  year         = {2012},
}