Microstructure determination of IQ-WB clays: a direct procedure by small-angle X-ray scattering
(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
- Segad, Mo LU
- organization
- publishing date
- 2013
- 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, < 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.}}, 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}}, }