Nature of flocculation and tactoid formation in montmorillonite: the role of pH.
(2015) In Physical Chemistry Chemical Physics 17(44). p.29608-29615- Abstract
- The dissolution and swelling properties of montmorillonite at different pH have been studied, using small angle X-ray scattering (SAXS), imaging and osmotic stress methods combined with Monte Carlo simulations. The acidity of montmorillonite dispersions has been varied as well as the counterions to the net negatively charged platelets. At low pH, Na montmorillonite dissolves and among other species Al(3+) is released, hydrated, polymerized and then it replaces the counterions in the clay. This dramatically changes the microstructure of Na montmorillonite, which instead of having fully exfoliated platelets, turns into a structure of aggregated platelets, so-called tactoids. Montmorillonite dispersion still has a significant extra-lamellar... (More)
- The dissolution and swelling properties of montmorillonite at different pH have been studied, using small angle X-ray scattering (SAXS), imaging and osmotic stress methods combined with Monte Carlo simulations. The acidity of montmorillonite dispersions has been varied as well as the counterions to the net negatively charged platelets. At low pH, Na montmorillonite dissolves and among other species Al(3+) is released, hydrated, polymerized and then it replaces the counterions in the clay. This dramatically changes the microstructure of Na montmorillonite, which instead of having fully exfoliated platelets, turns into a structure of aggregated platelets, so-called tactoids. Montmorillonite dispersion still has a significant extra-lamellar swelling among the tactoids due to the presence of very small nanoplatelets. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8149054
- author
- Segad, M ; Åkesson, Torbjörn LU ; Cabane, B and Jönsson, Bo LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Chemistry Chemical Physics
- volume
- 17
- issue
- 44
- pages
- 29608 - 29615
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:26477672
- wos:000364639700020
- scopus:84946763339
- pmid:26477672
- ISSN
- 1463-9084
- DOI
- 10.1039/c5cp04007h
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)
- id
- 985db844-faf9-4ab2-8059-c5ad32efcf63 (old id 8149054)
- date added to LUP
- 2016-04-01 10:10:29
- date last changed
- 2023-01-17 17:06:26
@article{985db844-faf9-4ab2-8059-c5ad32efcf63,
abstract = {{The dissolution and swelling properties of montmorillonite at different pH have been studied, using small angle X-ray scattering (SAXS), imaging and osmotic stress methods combined with Monte Carlo simulations. The acidity of montmorillonite dispersions has been varied as well as the counterions to the net negatively charged platelets. At low pH, Na montmorillonite dissolves and among other species Al(3+) is released, hydrated, polymerized and then it replaces the counterions in the clay. This dramatically changes the microstructure of Na montmorillonite, which instead of having fully exfoliated platelets, turns into a structure of aggregated platelets, so-called tactoids. Montmorillonite dispersion still has a significant extra-lamellar swelling among the tactoids due to the presence of very small nanoplatelets.}},
author = {{Segad, M and Åkesson, Torbjörn and Cabane, B and Jönsson, Bo}},
issn = {{1463-9084}},
language = {{eng}},
number = {{44}},
pages = {{29608--29615}},
publisher = {{Royal Society of Chemistry}},
series = {{Physical Chemistry Chemical Physics}},
title = {{Nature of flocculation and tactoid formation in montmorillonite: the role of pH.}},
url = {{http://dx.doi.org/10.1039/c5cp04007h}},
doi = {{10.1039/c5cp04007h}},
volume = {{17}},
year = {{2015}},
}