Gel trapping of dense colloids

Laxton, Peter B.; Berg, John C.

doi:10.1016/j.jcis.2004.11.006

Cited by 28 publications

(28 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In their work, Laxton and Berg (2005) observed sedimentation of colloids dispersed in a gel network that meets the yield parameter stability criterion proposed by Andres (1960). Laxton and Berg (2005) propose a second requirement for predicting the sedimentation stability of a system; the suspending medium must have tan δ < 1. The phase angle of the kaolin was measured with the Torque measurements as a function of vane depth for System I described in Table 3.2.…”

Section: Glass Bead Slurry Systemsmentioning

confidence: 69%

“…This might be explained by a combination of experimental variation and batch-tobatch variability in Systems I, J and G,H. Laxton and Berg (2005) discussed one explanation for this sedimentation discrepancy. In their work, Laxton and Berg (2005) observed sedimentation of colloids dispersed in a gel network that meets the yield parameter stability criterion proposed by Andres (1960).…”

Section: Glass Bead Slurry Systemsmentioning

confidence: 97%

“…Laxton and Berg (2005) discussed one explanation for this sedimentation discrepancy. In their work, Laxton and Berg (2005) observed sedimentation of colloids dispersed in a gel network that meets the yield parameter stability criterion proposed by Andres (1960). Laxton and Berg (2005) propose a second requirement for predicting the sedimentation stability of a system; the suspending medium must have tan δ < 1.…”

Section: Glass Bead Slurry Systemsmentioning

confidence: 99%

“…This indicates that viscous forces dominate elastic forces, and kaolin behaves more as a fluid than a gel. Hence, the stability criteria proposed by Laxton and Berg (2005) are not met, and the system is expected to sediment. While interesting, sedimentation of particles dispersed in a gel network is not the focus of this work.…”

Section: Glass Bead Slurry Systemsmentioning

confidence: 99%

See 3 more Smart Citations

Characterization and Correlation of Particle-Level Interactions to the Macroscopic Rheology of Powders, Granular Slurries, and Colloidal Suspensions

Poloski¹,

Daniel²,

Rector³

et al. 2006

Self Cite

View full text Add to dashboard Cite

Executive SummaryHanford TRU tank sludges are complex mixtures of undissolved minerals and salt solids in an aqueous phase of high ionic strength. They show complex rheological behavior resulting from interactions at the macroscopic level, such as interparticle friction between grains in the coarse fraction, as well as from interactions at the nano-scale level, such as the agglomeration of colloidal particles. An understanding of phenomena such as interparticle friction and aggregate stability under shear will allow better control of Hanford TRU tank sludges being processed for disposal.The project described in this report had two objectives. The first was to understand the physical properties and behavior of the Hanford transuranic (TRU) tank sludges under conditions that might exist during retrieval, treatment, packaging, and transportation for disposal at the Waste Isolation Pilot Plant (WIPP). The second objective was to develop a fundamental understanding of sludge physical properties by correlating the macroscopic behavior with interactions occurring at the particle/colloidal scale. These objectives were accomplished by: 1) measuring the physical and rheology properties of actual Hanford tank samples, 2) developing continuum models for coarse granular slurries, and 3) studying the behavior of colloidal agglomerates under shear and under ion irradiation.The shear strength of coarse granular powders and slurries was studied to determine ways of characterizing (quantifying) the effect of interparticle friction and cohesion on incipient motion. Additional studies were performed to develop and validate a continuum model for cohesionless granular powders and slurries undergoing three-dimensional shear. With regard to incipient motion in dense slurries, the immersion depth and containing vessel diameter significantly impact shear strength . A model accounting for the effects of interparticle friction, slurry cohesion, vane size and immersion depth, and container geometry was derived using a saturating vertical stress profile. This model was able to adequately explain experimental observations with regards to variations in container size and vane immersion depth. The functional form of the Janssen formula provides a potential scaling relationship to apply small-scale shear vane results to engineering-scale applications dealing with coarse-grained slurry systems.For granular systems undergoing three-dimensional flow, a constitutive model was developed to describe flows of cohesionless granular solids. The model is based on the postulate that the friction coefficient and the solids fraction in a moving granular material are exclusive functions of an inertial number, which represents the ratio of inertial to normal stress forces. The constitutive equation obtained has the same form as a multidimensional Bingham fluid model, albeit with an apparent viscosity and yield stress that depend on the vertical normal stress distribution. The model was applied to previously published experimental results dealing with three-dim...

show abstract

Section: Glass Bead Slurry Systemsmentioning

confidence: 69%

Section: Glass Bead Slurry Systemsmentioning

confidence: 97%

Section: Glass Bead Slurry Systemsmentioning

confidence: 99%

Section: Glass Bead Slurry Systemsmentioning

confidence: 99%

See 2 more Smart Citations

Characterization and Correlation of Particle-Level Interactions to the Macroscopic Rheology of Powders, Granular Slurries, and Colloidal Suspensions

Poloski¹,

Daniel²,

Rector³

et al. 2006

Self Cite

View full text Add to dashboard Cite

show abstract

“…1a. A logYlog plot of viscosity versus shear stress made the spotting of the yield stress easier, as opposed to stressYstrain curves (22). Two successive steady-state flow measurements were carried out with a two-minute interval to test if the shearing has an influence on the rheological parameters.…”

Section: Steady-state Flowmentioning

confidence: 99%

A Rheological Method to Evaluate the Physical Stability of Highly Viscous Pharmaceutical Oil-in-Water Emulsions

et al. 2006

View full text Add to dashboard Cite

show abstract

Camphene/polystyrene solutions: A rheological approach for material processing industry

Félix

Perez‐Puyana

Paúl

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Rheological properties of polymer-camphene solutions are very relevant as they affect their stability, and they have many implications in operation costs. This work elucidates the rheological properties of polystyrene (PS-camphene) solutions with industrial applications. Unfortunately, the assessment of the very low shear viscosities of camphene-based materials (below 0.005 Pa s) is still a challenge with commercial rheometers. Flow curves, stress growth tests, and small amplitude oscillatory shear (SAOS) measurements were carried out as a function of PS concentration (0, 2.5, 5.0, 10, and 20 wt % PS) to understand the rheological behavior of these systems. Results indicate that liquid camphene has a shear-thinning behavior (flow index = 0.99) when the increase of polymer concentration involves changes in the structure of these systems (flow index = 0.10 for 20 wt % PS). An increase in PS concentration leads to a forwarding in the shear-thinning zone, and the Newtonian region (from $1 s −1 , for 0 wt % PS, to 10 −3 s −1 for 20 wt % PS). Eventually, these results evidence the high dependence of η ∞ on PS concentration (from $1.16 AE 0.01 Pa s, for 0 wt % PS, to 631.5 AE 0.2 Pa s for 20 wt % PS).

show abstract

Gel trapping of dense colloids

Cited by 28 publications

References 7 publications

Characterization and Correlation of Particle-Level Interactions to the Macroscopic Rheology of Powders, Granular Slurries, and Colloidal Suspensions

Characterization and Correlation of Particle-Level Interactions to the Macroscopic Rheology of Powders, Granular Slurries, and Colloidal Suspensions

A Rheological Method to Evaluate the Physical Stability of Highly Viscous Pharmaceutical Oil-in-Water Emulsions

Camphene/polystyrene solutions: A rheological approach for material processing industry

Contact Info

Product

Resources

About