Clay minerals are abundant natural materials used widely in coatings, construction materials, ceramics, as well as being a component of drilling fluids. Here, we present the effect of steady and oscillatory preshear on organophilic modified clay gels in synthetic oil. Both platelet and needlelike particles are used as viscosifiers in drilling fluid formulations. For both particles, the plateau modulus exhibits a similar concentration dependence, , whereas the yield strain is for the platelets and for the needles. Mixtures of the two follow an intermediate behavior: at low concentrations, their elasticity and yield strain follows that of needle particles while at higher concentrations they exhibit a weaker power-law dependence. Furthermore, upon varying the preshear history, the gel viscoelastic properties can be significantly tuned. At lower (higher) clay concentrations, preshear at specific oscillatory strain amplitudes or steady shear rates may induce a hardening (softening) of the dispersions and, at all concentrations, a lowering of the shear strain. Hence, in needle dispersions preshear resulted in changes in the volume fraction dependence of the elastic modulus from to and of the yield strain from to . However, small angle x-ray scattering showed not much structural changes, within the q-range covered. Our findings indicate ways to design colloidal organoclay dispersions with a mechanical response that can be tuned at will.
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September 2024
Research Article|
August 01 2024
Tuning the mechanical properties of organophilic clay dispersions: Particle composition and preshear history effects
Nikolaos A. Burger
;
Nikolaos A. Burger
1
IESL-FORTH
, P.O. Box 1527, GR-711 10 Heraklion, Greece
2
Department of Materials Science and Technology, University of Crete
, Heraklion 70013, Greece
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Benoit Loppinet
;
Benoit Loppinet
1
IESL-FORTH
, P.O. Box 1527, GR-711 10 Heraklion, Greece
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Andrew Clarke
;
Andrew Clarke
3
SLB, Schlumberger Cambridge Research Ltd.
, High Cross, Madingley Road, Cambridge CB3 0EL, United Kingdom
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George Petekidis
George Petekidis
a)
1
IESL-FORTH
, P.O. Box 1527, GR-711 10 Heraklion, Greece
2
Department of Materials Science and Technology, University of Crete
, Heraklion 70013, Greece
a)Author to whom correspondence should be addressed; electronic mail: [email protected]
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a)Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Rheol. 68, 695–707 (2024)
Article history
Received:
March 24 2024
Accepted:
July 13 2024
Citation
Nikolaos A. Burger, Benoit Loppinet, Andrew Clarke, George Petekidis; Tuning the mechanical properties of organophilic clay dispersions: Particle composition and preshear history effects. J. Rheol. 1 September 2024; 68 (5): 695–707. https://doi.org/10.1122/8.0000854
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