scholarly journals Unravelling the role of phoretic and hydrodynamic interactions in active colloidal suspensions

Soft Matter ◽  
2020 ◽  
Vol 16 (38) ◽  
pp. 8893-8903
Author(s):  
Andrea Scagliarini ◽  
Ignacio Pagonabarraga
Keyword(s):  
Colloidal Suspensions ◽  
Hydrodynamic Interactions ◽  
Aggregation Kinetics ◽  
Cluster Growth ◽  
Cluster Morphology

We study numerically suspensions of self-diffusiophoretic colloids for various colloid–solute affinities. We show that hydrodynamics affects the aggregation kinetics and the cluster morphology, significantly hindering cluster growth.

Aggregation in Colloidal Suspensions: Evaluation of the Role of Hydrodynamic Interactions by Means of Numerical Simulations

2013 ◽  
Vol 117 (46) ◽  
pp. 14509-14517 ◽  
Author(s):  
A. Tomilov ◽  
A. Videcoq ◽  
M. Cerbelaud ◽  
M. A. Piechowiak ◽  
T. Chartier ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Colloidal Suspensions ◽  
Hydrodynamic Interactions

scholarly journals Hydrodynamics can determine the optimal route for microswimmer navigation

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Abdallah Daddi-Moussa-Ider ◽  
Hartmut Löwen ◽  
Benno Liebchen
Keyword(s):  
Flow Field ◽  
Hydrodynamic Interactions ◽  
Optimal Trajectories ◽  
Optimal Route ◽  
Active Particles ◽  
Navigation Strategy ◽  
Navigation Strategies

AbstractAs compared to the well explored problem of how to steer a macroscopic agent, like an airplane or a moon lander, to optimally reach a target, optimal navigation strategies for microswimmers experiencing hydrodynamic interactions with walls and obstacles are far-less understood. Here, we systematically explore this problem and show that the characteristic microswimmer-flow-field crucially influences the navigation strategy required to reach a target in the fastest way. The resulting optimal trajectories can have remarkable and non-intuitive shapes, which qualitatively differ from those of dry active particles or motile macroagents. Our results provide insights into the role of hydrodynamics and fluctuations on optimal navigation at the microscale, and suggest that microorganisms might have survival advantages when strategically controlling their distance to remote walls.

Observation of the Pinning-Induced Crystal-Hexatic-Glass Transition in Two-Dimensional Colloidal Suspensions

2021 ◽  
Vol 38 (10) ◽  
pp. 106101
Author(s):  
Xiaoyan Sun ◽  
Huaguang Wang ◽  
Hao Feng ◽  
Zexin Zhang ◽  
Yuqiang Ma
Keyword(s):  
Glass Transition ◽  
Colloidal Suspensions ◽  
Two Dimensional ◽  
Colloidal Systems ◽  
Fundamental Understanding ◽  
New Strategy ◽  
Glassy Materials ◽  
Colloidal Glass ◽  
Orientational Correlation

Identification of the glass formation process in various conditions is of importance for fundamental understanding of the mechanism of glass transitions as well as for developments and applications of glassy materials. We investigate the role of pinning in driving the transformation of crystal into glass in two-dimensional colloidal suspensions of monodisperse microspheres. The pinning is produced by immobilizing a fraction of microspheres on the substrate of sample cells where the mobile microspheres sediment. Structurally, the crystal-hexatic-glass transition occurs with increasing the number fraction of pinning ρ pinning, and the orientational correlation exhibits a change from quasi-long-range to short-range order at ρ pinning = 0.02. Interestingly, the dynamics shows a non-monotonic change with increasing the fraction of pinning. This is due to the competition between the disorder that enhances the dynamics and the pinning that hinders the particle motions. Our work highlights the important role of the pinning on the colloidal glass transition, which not only provides a new strategy to prevent crystallization forming glass, but also is helpful for understanding of the vitrification in colloidal systems.

Machine learning of lubrication correction based on GPR for the coupled DPD-DEM simulation of colloidal suspensions

Soft Matter ◽  
2021 ◽  
Author(s):  
Yi Wang ◽  
Jie Ouyang ◽  
Xiaodong Wang
Keyword(s):  
Machine Learning ◽  
Colloidal Suspensions ◽  
Hydrodynamic Interactions ◽  
Dem Simulation ◽  
Molecular Fluids ◽  
Close Range

Hydrodynamic interactions have a major impact on the suspension properties, but they are absent in atomic and molecular fluids due to a lack of intervening medium at close range. To...

Formation of hybrid colloids by suspension polycondensation in the presence of hydrophilic block copolymers

2002 ◽  
Vol 726 ◽  
Author(s):  
Corine Gerardin ◽  
Valérie Buissette ◽  
François Gaudemet ◽  
Olivier Anthony ◽  
Nicolas Sanson ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Colloidal Suspensions ◽  
Surface Charges ◽  
Inorganic Particles ◽  
Hydrous Oxides ◽  
Stabilization Phase ◽  
Metal Ratio ◽  
Forced Hydrolysis ◽  
Hydrolysis Of

AbstractDouble hydrophilic block copolymers were used to control the growth of inorganic particles and directly prepare hybrid colloidal suspensions. Colloids of metal hydrous oxides were obtained by forced hydrolysis of metal ions in presence of the copolymers. The block copolymers contain a metal-complexing polyelectrolyte block and a stabilizing neutral block. The role of the first block is to ensure a controlled growth of the inorganic phase, while simultaneously, the second block ensures the colloidal stabilization. Phase diagrams presenting the conditions under which precipitation is inhibited are established. The nanoparticles are then characterized in terms of sizes, morphologies and surface charges. The main parameters controlling the size were identified: the copolymer-to-metal ratio and the metal prehydrolysis ratio. The synthesis steps were characterized. First, a key step of induced micellization of the hydrophilic copolymers leads to hybrid core-shell assemblies. The second step consists in mineralization of the micellar core. The suspension polycondensation leads to hairy particles whose morphologies depend on the nature of the metal and on synthesis parameters.

Dynamics of polymers in solution: the role of time-dependent hydrodynamic interactions

1991 ◽  
Vol 24 (22) ◽  
pp. 5997-6005 ◽  
Author(s):  
J. Bonet Avalos ◽  
J. M. Rubi ◽  
D. Bedeaux
Keyword(s):  
Time Dependent ◽  
Hydrodynamic Interactions

Increasing aspect ratio of particles suppresses buckling in shells formed by drying suspensions

Soft Matter ◽  
2020 ◽  
Vol 16 (42) ◽  
pp. 9643-9647
Author(s):  
Ahmed Al Harraq ◽  
Bhuvnesh Bharti
Keyword(s):  
Aspect Ratio ◽  
Particle Shape ◽  
Colloidal Suspensions ◽  
Shape Anisotropy

The article identifies the role of particle shape anisotropy in suppressing the buckling of drying droplets of colloidal suspensions.

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