scholarly journals Shear Thickening in Concentrated Soft Sphere Colloidal Suspensions: A Shear Induced Phase Transition

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Joachim Kaldasch ◽  
Bernhard Senge ◽  
Jozua Laven
Keyword(s):  
Phase Transition ◽  
Colloidal Particles ◽  
Critical Shear Stress ◽  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Local Strain ◽  
Soft Sphere ◽  
Dense Suspensions ◽  
Continuous Shear ◽  
Sphere Suspensions

A model of shear thickening in dense suspensions of Brownian soft sphere colloidal particles is established. It suggests that shear thickening in soft sphere suspensions can be interpreted as a shear induced phase transition. Based on a Landau model of the coagulation transition of stabilized colloidal particles, taking the coupling between order parameter fluctuations and the local strain-field into account, the model suggests the occurrence of clusters of coagulated particles (subcritical bubbles) by applying a continuous shear perturbation. The critical shear stress of shear thickening in soft sphere suspensions is derived while reversible shear thickening and irreversible shear thickening have the same origin. The comparison of the theory with an experimental investigation of electrically stabilized colloidal suspensions confirms the presented approach.

scholarly journals Hydrodynamic and Contact Contributions to Continuous Shear Thickening in Colloidal Suspensions

2015 ◽  
Vol 115 (22) ◽  
Author(s):  
Neil Y. C. Lin ◽  
Ben M. Guy ◽  
Michiel Hermes ◽  
Chris Ness ◽  
Jin Sun ◽  
...  
Keyword(s):  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Continuous Shear

scholarly journals Localized stress fluctuations drive shear thickening in dense suspensions

2017 ◽  
Vol 114 (33) ◽  
pp. 8740-8745 ◽  
Author(s):  
Vikram Rathee ◽  
Daniel L. Blair ◽  
Jeffrey S. Urbach
Keyword(s):  
Shear Thickening ◽  
High Viscosity ◽  
Critical Material ◽  
Particulate Suspensions ◽  
Spatially Resolved ◽  
Direct Measurements ◽  
Dense Suspensions ◽  
Continuous Shear ◽  
Viscosity Fluid ◽  
Fluid Phases

Dense particulate suspensions exhibit a dramatic increase in average viscosity above a critical, material-dependent shear stress. This thickening changes from continuous to discontinuous as the concentration is increased. Using direct measurements of spatially resolved surface stresses in the continuous thickening regime, we report the existence of clearly defined dynamic localized regions of substantially increased stress that appear intermittently at stresses above the critical stress. With increasing applied stress, these regions occupy an increasing fraction of the system, and the increase accounts quantitatively for the observed shear thickening. The regions represent high-viscosity fluid phases, with a size determined by the distance between the shearing surfaces and a viscosity that is nearly independent of shear rate but that increases rapidly with concentration. Thus, we find that continuous shear thickening arises from increasingly frequent localized discontinuous transitions between distinct fluid phases with widely differing viscosities.

scholarly journals Reentrant Phase Transition in Charged Colloidal Suspensions

1988 ◽  
Vol 60 (23) ◽  
pp. 2438-2441 ◽  
Author(s):  
Akhilesh K. Arora ◽  
B. V. R. Tata ◽  
A. K. Sood ◽  
R. Kesavamoorthy
Keyword(s):  
Phase Transition ◽  
Colloidal Suspensions

scholarly journals Viscous-like forces control the impact response of shear-thickening dense suspensions

2021 ◽  
Vol 923 ◽  
Author(s):  
Marc-Andre Brassard ◽  
Neil Causley ◽  
Nasser Krizou ◽  
Joshua A. Dijksman ◽  
Abram. H. Clark
Keyword(s):  
Shear Thickening ◽  
Impact Response ◽  
Dense Suspensions ◽  
The Impact

Abstract

scholarly journals Shear thickening behavior in dense repulsive and attractive suspensions of hard spheres

Soft Matter ◽  
2021 ◽  
Author(s):  
Vikram Rathee ◽  
Alessandro Monti ◽  
Marco Edoardo Rosti ◽  
Amy Q Shen
Keyword(s):  
Flow Curve ◽  
Hard Spheres ◽  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Thickening Behavior ◽  
The Stability

Shear thickening in stable dense colloidal suspensions is a reversible phenomenon and no hysteresis is observed in the flow curve measurements. However, a reduction in the stability of colloids promotes...

Laser-Induced Pretransitional Ordering And Nonlinear Optical Properties Of Rigid-Rod Polymer Suspensions

1993 ◽  
Vol 328 ◽  
Author(s):  
Boris E. Vugmeister ◽  
Michelle S. Malcuit ◽  
John C. Kralik ◽  
Colleen Stevens
Keyword(s):  
Phase Transition ◽  
Colloidal Particles ◽  
Volume Fraction ◽  
Orientational Order ◽  
Critical Value ◽  
Orientational Relaxation ◽  
First Order ◽  
First Order Phase Transition ◽  
Rigid Rod ◽  
First Order Phase

ABSTRACTWe investigate the pretransitional behavior in laser-induced alignment of rigid rod-like polytetraflouroethylene (PTFE) suspensions. Using a laser-induced birefringence experiment, we measure both the orientational order parameter and the orientational relaxation time. We find that both increase as the volume fraction of colloidal particles approaches the critical value for the isotropic-nematic phase transition. Experimental results are compared with theory which takes into account the possibility of a first-order phase transition induced by a laser electric field.

Aggregation of binary colloidal suspensions on attractive walls

2016 ◽  
Vol 18 (4) ◽  
pp. 3073-3079 ◽  
Author(s):  
Aleena Laganapan ◽  
Davide Bochicchio ◽  
Marguerite Bienia ◽  
Arnaud Videcoq ◽  
Riccardo Ferrando
Keyword(s):  
Solid Surface ◽  
Colloidal Particles ◽  
Biological Systems ◽  
Colloidal Suspensions ◽  
Fundamental Importance

The adsorption of colloidal particles from a suspension on a solid surface is of fundamental importance to many physical and biological systems.

scholarly journals Mixed-order phase transition in a colloidal crystal

2017 ◽  
Vol 114 (49) ◽  
pp. 12906-12909 ◽  
Author(s):  
Ricard Alert ◽  
Pietro Tierno ◽  
Jaume Casademunt
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Colloidal Particles ◽  
Colloidal Crystal ◽  
Equilibrium Phase ◽  
Mean Field ◽  
Critical Dimension ◽  
Colloidal System ◽  
Test Bed ◽  
Mixed Order

Mixed-order phase transitions display a discontinuity in the order parameter like first-order transitions yet feature critical behavior like second-order transitions. Such transitions have been predicted for a broad range of equilibrium and nonequilibrium systems, but their experimental observation has remained elusive. Here, we analytically predict and experimentally realize a mixed-order equilibrium phase transition. Specifically, a discontinuous solid–solid transition in a 2D crystal of paramagnetic colloidal particles is induced by a magnetic field H. At the transition field Hs, the energy landscape of the system becomes completely flat, which causes diverging fluctuations and correlation length ξ∝|H2−Hs2|−1/2. Mean-field critical exponents are predicted, since the upper critical dimension of the transition is du=2. Our colloidal system provides an experimental test bed to probe the unconventional properties of mixed-order phase transitions.

scholarly journals Directional freezing of binary colloidal suspensions: a model for size fractionation of graphene oxide

Soft Matter ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 243-251 ◽  
Author(s):  
Xin Xu ◽  
Luofu Liu ◽  
Hongya Geng ◽  
Jianjun Wang ◽  
Jiajia Zhou ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Theoretical Model ◽  
Colloidal Particles ◽  
Colloidal Suspensions ◽  
Size Fractionation ◽  
Preferential Adsorption ◽  
Directional Freezing ◽  
Ice Phase

A theoretical model of a binary colloid suspension was developed by incorporating both the moving freezing boundary and the preferential adsorption of colloidal particles to the ice phase.

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