Abstract
The influence of pH between 7.5 and 10.5, for 5% and 6.42% aqueous Wyoming bentonite dispersions and of NaCl for 2%, 5% and 6.42% of Wyoming-bentonite in water for a range of salt concentrations up to 1.0 M has been investigated. The dispersions were prepared according to American Petroleum Institute procedures and rheological data were obtained with a Couette viscometer. Data were represented very well by the Herschel-Bulkley model for all experimental conditions. The effect of pH and electrolyte concentration is significant, affecting the type of association of the montmorillonite particles thus influencing the rheology, the three Herschel-Bulkley parameters and the apparent viscosity. There is a maximum of the yield stress, flow consistency index and apparent viscosity at the natural pH of the dispersions, while there is monotonous decrease of these parameters with increasing salt concentration. Various scenarios of particle associations are discussed and comparison with similar data from literature is also performed.
| Original language | English |
|---|---|
| Pages (from-to) | 86-96 |
| Number of pages | 11 |
| Journal | Applied Clay Science |
| Volume | 38 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Dec 2007 |
| Externally published | Yes |
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Keywords
- Effect of pH
- Effect of salt
- Herschel-Bulkley
- Wyoming bentonite dispersions
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geology
Cite this
Effect of pH and electrolyte on the rheology of aqueous Wyoming bentonite dispersions. / Kelessidis, Vassilios C.; Tsamantaki, Christina; Dalamarinis, Panayiotis.
In: Applied Clay Science, Vol. 38, No. 1-2, 12.2007, p. 86-96.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of pH and electrolyte on the rheology of aqueous Wyoming bentonite dispersions
AU - Kelessidis, Vassilios C.
AU - Tsamantaki, Christina
AU - Dalamarinis, Panayiotis
PY - 2007/12
Y1 - 2007/12
N2 - The influence of pH between 7.5 and 10.5, for 5% and 6.42% aqueous Wyoming bentonite dispersions and of NaCl for 2%, 5% and 6.42% of Wyoming-bentonite in water for a range of salt concentrations up to 1.0 M has been investigated. The dispersions were prepared according to American Petroleum Institute procedures and rheological data were obtained with a Couette viscometer. Data were represented very well by the Herschel-Bulkley model for all experimental conditions. The effect of pH and electrolyte concentration is significant, affecting the type of association of the montmorillonite particles thus influencing the rheology, the three Herschel-Bulkley parameters and the apparent viscosity. There is a maximum of the yield stress, flow consistency index and apparent viscosity at the natural pH of the dispersions, while there is monotonous decrease of these parameters with increasing salt concentration. Various scenarios of particle associations are discussed and comparison with similar data from literature is also performed.
AB - The influence of pH between 7.5 and 10.5, for 5% and 6.42% aqueous Wyoming bentonite dispersions and of NaCl for 2%, 5% and 6.42% of Wyoming-bentonite in water for a range of salt concentrations up to 1.0 M has been investigated. The dispersions were prepared according to American Petroleum Institute procedures and rheological data were obtained with a Couette viscometer. Data were represented very well by the Herschel-Bulkley model for all experimental conditions. The effect of pH and electrolyte concentration is significant, affecting the type of association of the montmorillonite particles thus influencing the rheology, the three Herschel-Bulkley parameters and the apparent viscosity. There is a maximum of the yield stress, flow consistency index and apparent viscosity at the natural pH of the dispersions, while there is monotonous decrease of these parameters with increasing salt concentration. Various scenarios of particle associations are discussed and comparison with similar data from literature is also performed.
KW - Effect of pH
KW - Effect of salt
KW - Herschel-Bulkley
KW - Wyoming bentonite dispersions
UR - http://www.scopus.com/inward/record.url?scp=36749000431&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=36749000431&partnerID=8YFLogxK
U2 - 10.1016/j.clay.2007.01.011
DO - 10.1016/j.clay.2007.01.011
M3 - Article
AN - SCOPUS:36749000431
VL - 38
SP - 86
EP - 96
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
IS - 1-2
ER -