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Microstructure determination of IQ-WB clays: a direct procedure by small-angle X-ray scattering

Segad, Mo LU (2013) In Journal of Applied Crystallography 46. p.1316-1322
Abstract
An accurate characterization of the microstructure of raw and pure homoionic clays from Wadi Bashira in Iraq (IQ-WB) has been carried out experimentally, using small-angle X-ray scattering (SAXS) and dynamic light scattering. The structures of lamellar IQ-WB dispersions were identified by these techniques and by complementary free swelling and dialysis experiments. SAXS measurements were used to resolve the characteristic distance, h(s), between individual platelets in Na IQ-WB and between platelets inside tactoids formed in Ca clays. The tactoids in raw and Ca IQ-WB have well formed lamellar structures where h(s) = 1.9 nm. The average lateral size, < D >, of a platelet is determined to be a few hundred nanometres. Analysis of the... (More)
An accurate characterization of the microstructure of raw and pure homoionic clays from Wadi Bashira in Iraq (IQ-WB) has been carried out experimentally, using small-angle X-ray scattering (SAXS) and dynamic light scattering. The structures of lamellar IQ-WB dispersions were identified by these techniques and by complementary free swelling and dialysis experiments. SAXS measurements were used to resolve the characteristic distance, h(s), between individual platelets in Na IQ-WB and between platelets inside tactoids formed in Ca clays. The tactoids in raw and Ca IQ-WB have well formed lamellar structures where h(s) = 1.9 nm. The average lateral size, < D >, of a platelet is determined to be a few hundred nanometres. Analysis of the SAXS peaks, based on the Scherrer relation, revealed a small difference in the average number of platelets per tactoid, < N > = 6-9, depending on platelet size and the concentrations of divalent counter-ions. It was also found that the average tactoid size can be estimated from an empirical relation as follows: < N > similar or equal to delta + alpha < D >, where delta is a constant and alpha the slope. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Applied Crystallography
volume
46
pages
1316 - 1322
publisher
International Union of Crystallography
external identifiers
  • wos:000324764500009
  • scopus:84884578817
ISSN
1600-5767
DOI
10.1107/S0021889813020931
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
153a6db2-8497-4dee-aeb1-3a68ae49151a (old id 4095892)
date added to LUP
2016-04-01 10:59:20
date last changed
2023-02-28 21:25:34
@article{153a6db2-8497-4dee-aeb1-3a68ae49151a,
  abstract     = {{An accurate characterization of the microstructure of raw and pure homoionic clays from Wadi Bashira in Iraq (IQ-WB) has been carried out experimentally, using small-angle X-ray scattering (SAXS) and dynamic light scattering. The structures of lamellar IQ-WB dispersions were identified by these techniques and by complementary free swelling and dialysis experiments. SAXS measurements were used to resolve the characteristic distance, h(s), between individual platelets in Na IQ-WB and between platelets inside tactoids formed in Ca clays. The tactoids in raw and Ca IQ-WB have well formed lamellar structures where h(s) = 1.9 nm. The average lateral size, &lt; D &gt;, of a platelet is determined to be a few hundred nanometres. Analysis of the SAXS peaks, based on the Scherrer relation, revealed a small difference in the average number of platelets per tactoid, &lt; N &gt; = 6-9, depending on platelet size and the concentrations of divalent counter-ions. It was also found that the average tactoid size can be estimated from an empirical relation as follows: &lt; N &gt; similar or equal to delta + alpha &lt; D &gt;, where delta is a constant and alpha the slope.}},
  author       = {{Segad, Mo}},
  issn         = {{1600-5767}},
  language     = {{eng}},
  pages        = {{1316--1322}},
  publisher    = {{International Union of Crystallography}},
  series       = {{Journal of Applied Crystallography}},
  title        = {{Microstructure determination of IQ-WB clays: a direct procedure by small-angle X-ray scattering}},
  url          = {{http://dx.doi.org/10.1107/S0021889813020931}},
  doi          = {{10.1107/S0021889813020931}},
  volume       = {{46}},
  year         = {{2013}},
}