The applicability of some constitutive equations for the solid stress tensor used in mixture model to describe shear-induced migration neutrally buoyant particles Newtonian fluids is investigated. It shown that moderately dense suspensions, where direct particle contacts and interparticle forces are negligible, must be due lubrication between particles. Results highlight accounting these part f...

I. ABSTRACT A practical 1 imitation ·of the application of Smoluchowski 1 s classical estimate for the collision probability of two diffusing spherical particles in Brownian motion is the non-consideration of interparticle forces. For suspended particles in water such forces can arise from the disturbance the particle causes in the fluid {hydrodynamic forces), from the cloud of ions which surro...

In a jammed solid of granular particles, the applied stress is in-homogeneously distributed within the packing. A full experimental characterization requires measurement of all the interparticle forces, but so far such measurements are limited to a few systems in two and even fewer in three dimensions. Particles with the topology of (elastic) shells are good local force sensors as relatively la...

The interaction between the solid particles and the pore fluid in granular materials affects various interparticle forces. The change in any one of these forces triggers the response of the granular skeleton, causes strain and even important fabric changes. Coupling phenomena that result in skeletal strains are related to fluid properties, electrical-chemical interactions, and thermal effects. ...

Optical forces acting on metallic nanoparticles can be used to organize mesoscale arrays for various applications. Here, we show that silver nanoparticles can be deposited as ordered arrays and chains on chemically modified substrates using a simple and facile optical trapping approach that we term “optical printing”. The deposited patterns show preferred separations between nanoparticles resul...

The flow and adhesion behavior of fine powders (approx. less than 10 microm) is significantly affected by the magnitude of attractive interparticle forces. Hence, the relative humidity and magnitude of capillary forces are critical parameters in the processing of these materials. In this investigation, approximate theoretical formulae are developed to predict the magnitude and onset of capillar...