Shear Fracture in Cone‐Plate Rheometry

Tanner, Roger I.; Keentok, M.

doi:10.1122/1.549698

Cited by 113 publications

(69 citation statements)

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“…Elastic shear fracture or edge fracture [15,16] manifests itself in a rapid drop off in stress (or increase in shear rate for a stress controlled rheometer) when shearing a highly elastic sample. This is due to the effective shearing radius decreasing as the fracture grows.…”

Section: General Errorsmentioning

confidence: 99%

Thin film and high shear rheology of multiphase complex fluids

Davies

Stokes

2008

Journal of Non-Newtonian Fluid Mechanics

112

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Section: General Errorsmentioning

confidence: 99%

Thin film and high shear rheology of multiphase complex fluids

Davies

Stokes

2008

Journal of Non-Newtonian Fluid Mechanics

112

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“…When the inertial forces exceed the surface tension of the fluid at the rheometer edge, the sample will eventually be ejected from between the two plates. For radial migration to be present, the centripetal force from the rheometer must exceed the confining surface tension of the fluid (Tanner and Keentok 1983;Pipe et al 2008):…”

Section: Flow Instabilitiesmentioning

confidence: 99%

Shear thickening of chemical mechanical polishing slurries under high shear

et al. 2012

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Chemical mechanical polishing (CMP) is a fundamental technology used in the semiconductor manufacturing industry to polish and planarize electronic materials. During the high shear (≥1,000,000 s −1 ) polishing process, it is hypothesized that individual slurry particles begin to interact and collide with one another forming large agglomerates (≥0.5 μm). These agglomerates are suspected of causing defects such as scratches or gouges during polishing, which costs the semiconductor industry billions of dollars annually. We have developed a method for investigating the shear thickening behavior of fumed silica slurries (20-34 wt.%) under high shear using a parallel-plate geometry in a conventional rotating rheometer. The CMP slurries displayed irreversible thickening at shear rates exceeding 10,000 s −1 . Viscous heating and sample evaporation are shown to be inconsequential to the witnessed shear thickening behavior. Also, the observed thickening is not a result of a critical rheometer speed, as the thickening was independent of the experimental gap height. In agreement with previous work, the slurries thickened at lower shear rates as silica concentration was increased. The shear thickening of the fumed N. Crawford · M. Liberatore (B) silica slurries is truly shear-induced, and therefore, the thickening of CMP slurries can be examined using a rotational rheometer at small gap heights (≤100 μm).

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“…Additionally, macroscale rheometry is often confounded by the onset of edge fracture, flow instabilities and air entrainment [Fardin et al (2009);Tanner & Keentok (1983);Wheeler et al (1998)], limiting the maximum observable shear rates to valuesγ ≤γ 2 . Microfluidic devices, however, offer a means of overcoming this limit in observable deformation rates, facilitating investigation of the connection between flow kinematics and microstructual feature of worm-like micellar systems in the non-linear regime.…”

Section: A Macroscale Shear Flows and Shear-bandingmentioning

confidence: 99%

Spatially resolved quantitative rheo-optics of complex fluids in a microfluidic device

Ober¹,

Soulages²,

McKinley³

2011

Journal of Rheology

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In this study, we use micro-particle image velocimetry (µ-PIV) and adapt a commercial birefringence microscopy system for making full-field, quantitative measurements of flow-induced birefringence (FIB) for the purpose of microfluidic, opticalrheometry of two worm-like micellar solutions. In combination with conventional rheometric techniques, we use our microfluidic rheometer to study the properties of a shear-banding solution of cetylpyridinium chloride (CPyCl) with sodium salicylate (NaSal) and a nominally shear thinning system of cetyltrimethylammonium bromide (CTAB) with NaSal across many orders of magnitude of deformation rates (10 −2 ≤γ ≤ 10 4 s −1 ). We use µ-PIV to quantify the local kinematics and use the birefringence microscopy system in order to obtain high-resolution measurements of the changes in molecular orientation in the worm-like fluids under strong deformations in a microchannel. The FIB measurements reveal that the CPyCl system exhibits regions of localized, high optical anisotropy indicative of shear bands near the channel walls, whereas the birefringence in the shear-thinning CTAB system varies more smoothly across the width of the channel as the volumetric flow rate is increased. We compare the experimental results to the predictions of a simple constitutive model, and we document the break-down in the stress optical rule as the characteristic rate of deformation is increased.

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Shear Fracture in Cone‐Plate Rheometry

Cited by 113 publications

References 0 publications

Thin film and high shear rheology of multiphase complex fluids

Thin film and high shear rheology of multiphase complex fluids

Shear thickening of chemical mechanical polishing slurries under high shear

Spatially resolved quantitative rheo-optics of complex fluids in a microfluidic device

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