A new method of application of Stokesian dynamics, which can efficiently simulate movements of up to 500 particles with interparticle interactions in reasonable computational times, has been developed for the purpose of investigating particle-cluster aggregation in aqueous systems. The method is applied to monodisperse non-Brownian spherical particles aggregating in differential settling, while...

We consider a system of particles that simultaneously move on a two-dimensional periodic lattice at discrete times steps. Particles remember their last direction of movement and may either choose to continue moving in this direction, remain stationary, or move toward one of their neighbors. The form of motion is chosen based on predetermined stationary probabilities. Simulations of this model r...

Nanoscale zerovalent iron (NZVI), promising for in situ degradation of many environmental contaminants, has been shown to aggregate reducing reactivity and mobility. Aggregation is attributed to the magnetic attractive forces between particles. In this study an alternating gradient force magnetometer (AGFM) is used to measure magnetic properties of NZVI. The magnetization curve is modeled accor...

The interlocking and packing of aggregate particles play a key role in achieving high level linear viscoelastic properties rutting resistance asphalt mix for sustainable pavements. In this study, the quantitative effect fractured (FAPs) on loading (i.e., 500 kPa normal stress), along with resilience mixes, was evaluated. Linear nonlinear stress behaviors aggregates (from direct shear test) mixe...

We consider the following problem in one-dimensional diffusionlimited aggregation (DLA). At time t, we have an “aggregate” consisting of Z ∩ [0,R(t)] [with R(t) a positive integer]. We also have N(i, t) particles at i, i > R(t). All these particles perform independent continuous-time symmetric simple random walks until the first time t > t at which some particle tries to jump from R(t)+1 to R(t...

Experimental approaches in concrete technology are time-consuming, laborious and thus expensive. Developments in computer facilities render possible nowadays realistically simulating the particulate structure and microstructure of cementitious materials. For that purpose, discrete element methods (DEM) are required because of more correctly simulating particle dispersion. Dynamic DEMs like Delf...

Abst rac t -Previous work (b.~ us and others) has shown that sediment trap fluxes do not correlate well with the total particulate mass concentration as determined with a t ransmlssometer Sediment traps are thought to collect the settling particles in the marine snow size range (d > 0 5 mm) Cameras ha,~e been developed to quantitatively image particles in the marine snow size range but a correl...

We study the phase ordering colloids suspended in a thermotropic nematic liquid crystal below the clearing point Tni and the resulting aggregated structure. Small (150 nm) PMMA particles are dispersed in a classical liquid crystal matrix, 5CB or MBBA. With the help of confocal microscopy we show that small colloid particles densely aggregate on thin interfaces surrounding large volumes of clean...