Local transient rheological behavior of concentrated suspensions

Local transient rheological behavior of concentrated suspensions

Obtaining Reliable Transient Rheological Data on concentrated Short Fiber Suspensions using a Rotational Rheometer

Polyelectrolyte Effects on the Rheological Properties of Concentrated Cement Suspensions

Polyelectrolyte species, known as superplasticizers, dramatically affect the rheological properties of dense cement suspensions. We have studied the influence of sulfonated naphthalene formaldehyde condensate (SNF) and carboxylated acrylic ester (CAE) grafted copolymers of varying molecular architecture on the surface (e.g., adsorption behavior and zeta potential) and rheological properties of ...

The rheological behavior of concentrated colloidal dispersions

A simple model for the rheological behavior of concentrated colloidal dispersions is developed. For a suspension of Brownian hard spheres there are two contributions to the macroscopic stress: a hydrodynamic and a Brownian stress. For small departures from equilibrium, the hydrodynamic contribution is purely dissipative and gives the high-frequency dynamic viscosity. The Brownian contribution h...

Scaling of transient hydrodynamic interactions in concentrated suspensions.

The mean-square displacement 〈Δr2(τ)〉 of particles in concentrated suspensions is measured at times sufficiently short to observe the transient nature of hydrodynamic interactions. For all volume fractions φ, the velocity autocorrelation function decays as a power law R(τ)∼τ−3/2. A remarkable scaling with φ is observed for the time-dependent self-diffusion coefficient Ds(τ)=〈Δr2(τ)〉/6τ: If Ds(τ...