Formation of monodispersed colloidal particles is a complex process: nuclei, produced rapidly in a supersaturated solution, grow to nanosize primary particles, which then aggregate (coagulate) to form much larger final colloids. This paper reviews a kinetic model that explains the formation of dispersions of narrow size distribution in such processes. Numerical simulations of the kinetic equati...

Significant aggregation takes place when nanoparticles are blended into a random amorphous polymeric medium, contrary to in situ generation which results in uniform size distributions. In the present paper, we propose a theoretical model to study the size and distribution of aggregates that take place when the particles are blended into a random amorphous mobile elastomeric medium. We test the ...

We have studied the effect of shear on the stability of suspensions made of non-Brownian solid particles. We demonstrate the existence of an irreversible transition where the solid particles aggregate at remarkably low volume fractions (phi approximately 0.1). This shear-induced aggregation is dramatic and exhibits a very sudden change in the viscosity, which increases sharply after a shear-dep...

Using laser tweezers, we study colloidal interactions of solid microspheres in the nematic bulk caused by elastic distortions around the particles with tangential surface anchoring. The interactions overcome the Brownian motion when the interparticle separation r-->p is less than 3 particle diameters. The particles attract when the angle theta between r-->p and the uniform far-field director n0...

We present results from recent simulations of the formation and evolution of clusters of galaxies in a ΛCDM cosmology. These simulations contain our most physically complete input physics to date including radiative cooling, star formation that transforms rapidly cooling material into aggregate star particles and we also model the thermal feedback from resulting supernovae in the star particles...

We report that a variety of ternary particle/liquid/liquid mixtures heavily aggregate or separate completely if (1) the particles are fully or almost fully wetted by one fluid, and (2) if the wetting fluid volume fraction is comparable to the particle volume fraction. Aggregation and separation do not happen if the particles are partially wetted by both fluids, in which case Pickering emulsions...

In the article the equations of a kinetics of coagulation of disperse systems and theory of a solvate layer of colloidal particles are given. 1. KINETIC EQUATION of COAGULATION The particles of colloids and suspensions in relation to molecules are macroobjects, and in matching with customary macroobjects have the microscopic sizes, i.e. take an intermediate standing in scale hierarchy. At the s...

This paper presents a novel reconstruction algorithm for binary tomography based on the movement of particles. Particle Aggregate Reconstruction Technique (PART) supposes that pixel values are particles, and that the particles can diffuse through the image, sticking together in regions of uniform pixel value known as aggregates. The algorithm is tested on four phantoms of varying sizes and numb...

This paper reports the geometrical characteristics and growth of aggregate silica particles generated in a premixed flame using thermophoretic sampling, light scattering technique, dynamics modeling only for flat condition. The area equivalent size morphology thermophoretically collected were analyzed through images taken from transmission electron microscope. particle stream flames was visuali...

Crumb rubber is basically tiny particles produced from scrap vehicle tires. This crumbled into uniform with the help of shredders. In present work, an attempt has been made to utilize as a partial substitute fine aggregates in fabricating cement concretes. Concrete mixture cement, coarse aggregates, and water. Rubber size ranging between 0.297 0.250 mm are used proportion 5, 10 15% by weight pa...