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Intercalation of smectite with liquid ethylene glycol - Resolved in time and space by synchrotron X-ray diffraction

Svensson, Daniel LU and Hansen, Staffan LU (2010) In Applied Clay Science 48(3). p.358-367
Abstract
Using synchrotron X-ray powder diffraction we studied the reaction of liquid ethylene glycol and smectite, i.e. (i) the time-resolved glycolation of Mg-smectite (Georgian Ibeco Seal M-90) films equilibrated to form hydrates with 0-3 water layers, and (ii) time and spatially resolved glycolation of homoionic Li-, Na-, K-, Mg-, and Ca-montmorillonite powders (Wyoming MX80) equilibrated to ambient atmosphere and packed in glass capillaries. The films in (i) were approximately 65 run thick and complete reaction was achieved within minutes. The relative intensity of the 17 angstrom-smectite-glycolate varied linearly with the square root of time and the effective diffusion coefficients were determined to be of the order of 10(-11) m(2)/s. In the... (More)
Using synchrotron X-ray powder diffraction we studied the reaction of liquid ethylene glycol and smectite, i.e. (i) the time-resolved glycolation of Mg-smectite (Georgian Ibeco Seal M-90) films equilibrated to form hydrates with 0-3 water layers, and (ii) time and spatially resolved glycolation of homoionic Li-, Na-, K-, Mg-, and Ca-montmorillonite powders (Wyoming MX80) equilibrated to ambient atmosphere and packed in glass capillaries. The films in (i) were approximately 65 run thick and complete reaction was achieved within minutes. The relative intensity of the 17 angstrom-smectite-glycolate varied linearly with the square root of time and the effective diffusion coefficients were determined to be of the order of 10(-11) m(2)/s. In the one-layer hydrate experiment the basal spacing increased from 12.5 to 14.5 angstrom during the reaction, which indicated a redistribution of water in the sample. The capillaries in (ii) were 1.5 mm in diameter and were investigated along their length using a 1 x 1 mm X-ray beam. The wet part contained the 17 angstrom-montmorillonite-glycolate in all cases. In the dry part, close to the wetting front, a 0.5-2 mm zone with increased basal spacing was observed in all cases, except for the K-form. The zone with increased hydration contained: more two-layer-hydrate (Li, Na), four-layer-hydrate (Mg) and three-layer-hydrate (Mg, Ca). Further from the liquid the montmorillonite was present in its original hydration state as one-layer-hydrate (Li, Na,K) or two-layer-hydrate (Mg, Ca). The transport of liquid glycol into the montmorillonite in the tube was thus coupled to a transport of water on the mm-scale. (C) 2010 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Montmorillonite, Smectite, Intercalation, Glycol, XRD, Time-resolved
in
Applied Clay Science
volume
48
issue
3
pages
358 - 367
publisher
Elsevier
external identifiers
  • wos:000277847200010
  • scopus:77951093120
ISSN
1872-9053
DOI
10.1016/j.clay.2010.01.006
language
English
LU publication?
yes
id
bfe11343-cd19-4e82-8594-b661ac18d95e (old id 1617622)
date added to LUP
2010-06-21 12:44:31
date last changed
2018-05-29 11:50:14
@article{bfe11343-cd19-4e82-8594-b661ac18d95e,
  abstract     = {Using synchrotron X-ray powder diffraction we studied the reaction of liquid ethylene glycol and smectite, i.e. (i) the time-resolved glycolation of Mg-smectite (Georgian Ibeco Seal M-90) films equilibrated to form hydrates with 0-3 water layers, and (ii) time and spatially resolved glycolation of homoionic Li-, Na-, K-, Mg-, and Ca-montmorillonite powders (Wyoming MX80) equilibrated to ambient atmosphere and packed in glass capillaries. The films in (i) were approximately 65 run thick and complete reaction was achieved within minutes. The relative intensity of the 17 angstrom-smectite-glycolate varied linearly with the square root of time and the effective diffusion coefficients were determined to be of the order of 10(-11) m(2)/s. In the one-layer hydrate experiment the basal spacing increased from 12.5 to 14.5 angstrom during the reaction, which indicated a redistribution of water in the sample. The capillaries in (ii) were 1.5 mm in diameter and were investigated along their length using a 1 x 1 mm X-ray beam. The wet part contained the 17 angstrom-montmorillonite-glycolate in all cases. In the dry part, close to the wetting front, a 0.5-2 mm zone with increased basal spacing was observed in all cases, except for the K-form. The zone with increased hydration contained: more two-layer-hydrate (Li, Na), four-layer-hydrate (Mg) and three-layer-hydrate (Mg, Ca). Further from the liquid the montmorillonite was present in its original hydration state as one-layer-hydrate (Li, Na,K) or two-layer-hydrate (Mg, Ca). The transport of liquid glycol into the montmorillonite in the tube was thus coupled to a transport of water on the mm-scale. (C) 2010 Elsevier B.V. All rights reserved.},
  author       = {Svensson, Daniel and Hansen, Staffan},
  issn         = {1872-9053},
  keyword      = {Montmorillonite,Smectite,Intercalation,Glycol,XRD,Time-resolved},
  language     = {eng},
  number       = {3},
  pages        = {358--367},
  publisher    = {Elsevier},
  series       = {Applied Clay Science},
  title        = {Intercalation of smectite with liquid ethylene glycol - Resolved in time and space by synchrotron X-ray diffraction},
  url          = {http://dx.doi.org/10.1016/j.clay.2010.01.006},
  volume       = {48},
  year         = {2010},
}