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Reactivity, swelling and aggregation of mixed-size silicate nanoplatelets

Segad, M.; Cabane, B. and Jönsson, Bo LU (2015) In Nanoscale 7(39). p.16290-16297
Abstract
Montmorillonite is a key ingredient in a number of technical applications. However, little is known regarding the microstructure and the forces between silicate platelets. The size of montmorillonite platelets from different natural sources can vary significantly. This has an influence on their swelling behavior in water as well as in salt solutions, particularly when tactoid formation occurs, that is when divalent counterions are present in the system. A tactoid consists of a limited number of platelets aggregated in a parallel arrangement with a constant separation. The tactoid size increases with platelet size and with very small nanoplatelets, similar to 30 nm, no tactoids are observed irrespectively of the platelet origin and... (More)
Montmorillonite is a key ingredient in a number of technical applications. However, little is known regarding the microstructure and the forces between silicate platelets. The size of montmorillonite platelets from different natural sources can vary significantly. This has an influence on their swelling behavior in water as well as in salt solutions, particularly when tactoid formation occurs, that is when divalent counterions are present in the system. A tactoid consists of a limited number of platelets aggregated in a parallel arrangement with a constant separation. The tactoid size increases with platelet size and with very small nanoplatelets, similar to 30 nm, no tactoids are observed irrespectively of the platelet origin and concentration of divalent ions. The formation and dissociation of tactoids seem to be reversible processes. A large proportion of small nanoplatelets in a mixed-size system affects the tactoid formation, reduces the aggregation number and increases the extra-lamellar swelling in the system. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
7
issue
39
pages
16290 - 16297
publisher
Royal Society of Chemistry
external identifiers
  • wos:000362350700020
  • scopus:84942897137
ISSN
2040-3372
DOI
10.1039/c5nr04615g
language
English
LU publication?
yes
id
07ee9919-5820-4c2e-9729-d2eb3733b454 (old id 8220650)
date added to LUP
2015-11-30 08:08:55
date last changed
2017-01-01 03:43:03
@article{07ee9919-5820-4c2e-9729-d2eb3733b454,
  abstract     = {Montmorillonite is a key ingredient in a number of technical applications. However, little is known regarding the microstructure and the forces between silicate platelets. The size of montmorillonite platelets from different natural sources can vary significantly. This has an influence on their swelling behavior in water as well as in salt solutions, particularly when tactoid formation occurs, that is when divalent counterions are present in the system. A tactoid consists of a limited number of platelets aggregated in a parallel arrangement with a constant separation. The tactoid size increases with platelet size and with very small nanoplatelets, similar to 30 nm, no tactoids are observed irrespectively of the platelet origin and concentration of divalent ions. The formation and dissociation of tactoids seem to be reversible processes. A large proportion of small nanoplatelets in a mixed-size system affects the tactoid formation, reduces the aggregation number and increases the extra-lamellar swelling in the system.},
  author       = {Segad, M. and Cabane, B. and Jönsson, Bo},
  issn         = {2040-3372},
  language     = {eng},
  number       = {39},
  pages        = {16290--16297},
  publisher    = {Royal Society of Chemistry},
  series       = {Nanoscale},
  title        = {Reactivity, swelling and aggregation of mixed-size silicate nanoplatelets},
  url          = {http://dx.doi.org/10.1039/c5nr04615g},
  volume       = {7},
  year         = {2015},
}