Rheology of aqueous carbon black dispersions

Barrie, Claire L.; Griffiths, Peter Charles; Abbott, R. J.; Grillo, Isabelle; Kudryashov, Evgeny; Smyth, Cormac

doi:10.1016/j.jcis.2003.12.004

Cited by 54 publications

(37 citation statements)

References 17 publications

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“…The double yielding behavior (i.e., the presence of two yield stresses) for the intermediate polymer content was observed in the prior work. 25 The second yielding, which occurs at a higher shear stress, was attributed in the prior work to the interaction of the polymer film on the carbon black with the polymer in the water. For lower or higher polymer contents, only single yielding was observed.…”

Section: Introductionmentioning

confidence: 92%

“…25 The double yielding in the CB pastes is probably related to the aggregate structure of the carbon black. The first yielding may be due to the shear of one aggregate relative to another, whereas the second yielding may be due to the shear of one particle relative to another.…”

Section: Plastic Viscosity and Shear Yield Stress Determined By Shearmentioning

confidence: 99%

“…Prior work involving rheometry has involved carbon black (15 vol.%) aqueous dispersions, 25 which are not suitable for use as thermal pastes due to the volatility of water and the requirement for thermal pastes to withstand elevated temperatures. The double yielding behavior (i.e., the presence of two yield stresses) for the intermediate polymer content was observed in the prior work.…”

Section: Introductionmentioning

confidence: 99%

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Rheological Behavior of Thermal Interface Pastes

Lin

Chung

2009

Journal of Elec Materi

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Polyol-ester-based thermal pastes containing carbon black, fumed alumina or nanoclay exhibit Bingham plastic behavior with shear thinning. Carbon black gives double yielding, but fumed alumina and nanoclay give single yielding. The plastic viscosity increases with the solid content. Antioxidants increase the plastic viscosity and yield stresses. Nanoclay (1.0 vol.%) gives low shear moduli, high critical shear strain, and high loss tangent, thus resulting in low bond-line thickness and high thermal contact conductance for smooth (0.009 lm) proximate surfaces. Carbon black (Tokai, 8.0 vol.%) gives high moduli, low critical strain, and low loss tangent, thus resulting in high bondline thickness, though the high thermal conductivity due to the high solid content results in high thermal contact conductance for rough (15 lm) proximate surfaces. Antioxidants enhance the solid-like character, increase the yield stress, plastic viscosity, and bond-line thickness, and decrease the thermal contact conductance.

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Section: Introductionmentioning

confidence: 92%

Section: Plastic Viscosity and Shear Yield Stress Determined By Shearmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rheological Behavior of Thermal Interface Pastes

Lin

Chung

2009

Journal of Elec Materi

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“…On the basis of zeta potential, the shifting from negative to positive sign indicates an excess amine presence beyond the complete coverage of pigment surface. In the literature, an excess amount of dispersant can only cause a bridge effect leading to an unnecessarily high viscosity [23]. Overall, the performances such as transparency and fine particle size can be correlated to the copolymer structure of molecular weight and amine multiplicity.…”

Section: Viscosity and Optical Properties Of The Dispersion Relating mentioning

confidence: 99%

Synthesis of acrylic copolymers consisting of multiple amine pendants for dispersing pigment

Chen

Hsu

Lin

et al. 2009

Journal of Colloid and Interface Science

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“…Hence, it comes as no surprise that experiments that probe yielding itself show the transition to be more progressive and to have an intrinsic timedependence. For example, creep testing reveals viscoelasticity at stresses below yielding followed by time-dependent yield over a range of stresses rather than at a single stress (Barrie et al 2004;Gibaud et al 2010; Le Grand and Petekidis 2008;Uhlherr et al 2005). Other descriptions of yield such as critical strain energy W y or yield strain γ y may be more appropriate for suspension behaviour (ten Brinke et al 2008) compared to yield stress.…”

Section: Introductionmentioning

confidence: 99%

The effect of premature wall yield on creep testing of strongly flocculated suspensions

et al. 2015

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Measuring yielding in cohesive suspensions is often hampered by slip at measurement surfaces. This paper presents creep data for strongly-flocculated suspensions obtained using vane-in-cup tools with differing cup-to-vane diameter ratios. The three suspensions were titania and alumina aggregated at their isoelectric points and polymer-flocculated alumina.The aim was to find the diameter ratio where slip or premature yielding at the cup wall had no effect on the transient behaviour. The large diameter ratio results showed readily understandable material behaviour comprising linear viscoelasticity at low stresses, strainsoftening close to yielding, time-dependent yield across a range of stresses and then viscous flow. Tests in small ratio geometries however showed more complex responses. Effects attributed to the cup wall included delayed softening, slip, multiple yielding and stick-slip events, and unsteady flow. The conclusion was that cups have to be relatively large to eliminate wall artefacts. A diameter ratio of three was sufficient in practice, although the minimum ratio must be material dependent.

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Rheology of aqueous carbon black dispersions

Cited by 54 publications

References 17 publications

Rheological Behavior of Thermal Interface Pastes

Rheological Behavior of Thermal Interface Pastes

Synthesis of acrylic copolymers consisting of multiple amine pendants for dispersing pigment

The effect of premature wall yield on creep testing of strongly flocculated suspensions

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