Rheology of Dilute Suspensions of Hard Platelike Colloids

Kooij, F.M. van der; Boek, Edo S.; Philipse, Albert P.

doi:10.1006/jcis.2000.7336

Cited by 45 publications

(28 citation statements)

References 30 publications

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“…The other one is a more realistic representation which includes the spherical detail and could be called a rough sphere model; it has been used before in simulation studies. [8][9][10][11] In the rough sphere model, the sphere can be defined by a local freezing of fluid particles. The particles comprising a solid sphere remain at a fixed relative position.…”

Section: Simulations Of the Sphere By Dpdmentioning

confidence: 99%

“…For higher solid volume fractions, it is necessary to increase the system size to avoid finite size and resolution effects. Van der Kooij et al 11 studied the rheology of dilute suspensions of hard plate-like colloids by combining rheological measurements on suspensions of sterically stabilized plate-like colloids with dissipative particle dynamics simulation for disks, obtained good results for the intrinsic viscosity of hard plate suspension. Whittle and Dickinson 12 discussed the application of DPD to the study of colloidal systems composed of spherical particles, and developed a new model based on DPD particles with a central core and considered the effects of various parameters.…”

Section: Introductionmentioning

confidence: 97%

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Flow around spheres by dissipative particle dynamics

et al. 2006

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The dissipative particle dynamics (DPD) method is used to study the flow behavior past a sphere. The sphere is represented by frozen DPD particles while the surrounding fluids are modeled by simple DPD particles (representing a Newtonian fluid). For the surface of the sphere, the conventional model without special treatment and the model with specular reflection boundary condition proposed by Revenga et al. [Comput. Phys. Commun. 121–122, 309 (1999)] are compared. Various computational domains, in which the sphere is held stationary at the center, are investigated to gage the effects of periodic conditions and walls for Reynolds number (Re)=0.5 and 50. Two types of flow conditions, uniform flow and shear flow are considered, respectively, to study the drag force and torque acting on the stationary sphere. It is found that the calculated drag force imposed on the sphere based on the model with specular reflection is slightly lower than the conventional model without special treatment. With the conventional model the drag force acting on the sphere is in better agreement with experimental correlation obtained by Brown and Lawler [J. Environ. Eng. 129, 222 (2003)] for the case of larger radius up to Re of about 5. The computed torque also approaches the analytical Stokes value when Re<1. For a force-free and torque-free sphere, its motion in the flow is captured by solving the translational and rotational equations of motion. The effects of different DPD parameters (a, γ, and σ) on the drag force and torque are studied. It shows that the dissipative coefficient (γ) mainly affects the drag force and torque, while random and conservative coefficient have little influence on them. Furthermore the settling of a single sphere in square tube is investigated, in which the wall effect is considered. Good agreement is found with the experiments of Miyamura et al. [Int. J. Multiphase Flow 7, 31 (1981)] and lattice-Boltzmann simulation results of Aidun et al. [J. Fluid Mech. 373, 287 (1998)].

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Section: Simulations Of the Sphere By Dpdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Flow around spheres by dissipative particle dynamics

et al. 2006

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“…The size of the particles can be varied slightly by varying the reaction conditions. Particles prepared following this method are used as model colloids for studies on dynamics [18,19] and phase behavior of platelets [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Seeded growth of monodisperse gibbsite platelets to adjustable sizes

Wijnhoven

2005

Journal of Colloid and Interface Science

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Nanosized hexagonal gibbsite seeds are grown from a mixture of dissolved alumina alkoxides at 85 • C. Centrifugation reduces the polydispersity by 30%. The seeds can be grown further by adding them to a fresh alkoxide mixture and heating it. This procedure was repeated several times to obtain particles of 570 nm ± 11% diameter and a thickness of 47 ± 23%. No indications of a size limit were observed. The thus obtained particles may form easily a columnar phase. Individual gibbsite particles in solution can be seen by confocal microscope.  2005 Elsevier Inc. All rights reserved.

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“…Suspensions of non-magnetic rod-like or disk-like particles have vigorously been investigated by many researchers: for example, regarding rheological properties [21][22][23][24][25] and orientational characteristics [26][27][28][29]. In the present study, however, we focus on a suspension composed of magnetic rod-like particles in order to discuss aggregation phenomena in such a suspension.…”

Section: Introductionmentioning

confidence: 96%

On aggregate structures in a rod-like haematite particle suspension by means of Brownian dynamics simulations

Satoh

2014

Molecular Physics

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We have investigated aggregation phenomena in a suspension composed of rod-like haematite particles by means of Brownian dynamics simulations. The magnetic moment of the haematite particles lies normal to the particle axis direction and therefore the present Brownian dynamics method takes into account the spin rotational Brownian motion about the particle axis. We have investigated the influence of the magnetic particle-field and particle-particle interactions, the shear rate and the volumetric fraction of particles on the particle aggregation phenomena. Snapshots of aggregate structures are used for a qualitative discussion and the cluster size distribution, radial distribution function and the orientational correlation functions of the direction of particle axis and magnetic moment are the focus for a quantitative discussion. The significant formation of raft-like clusters is found to occur at a magnetic particle-particle interaction strength much larger than that required for a magnetic spherical particle suspension. This is because the rotational Brownian motion has a significant influence on the formation of clusters in a suspension of rod-like particles with a large aspect ratio. An applied magnetic field enhances the formation of raft-like clusters. A shear flow does not have a significant influence on the internal structure of the clusters, but influences the cluster size distribution of the raft-like clusters.

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Rheology of Dilute Suspensions of Hard Platelike Colloids

Cited by 45 publications

References 30 publications

Flow around spheres by dissipative particle dynamics

Flow around spheres by dissipative particle dynamics

Seeded growth of monodisperse gibbsite platelets to adjustable sizes

On aggregate structures in a rod-like haematite particle suspension by means of Brownian dynamics simulations

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