The change of viscosity with concentration of suspended particles and a new concept of gelation

Abstract

The change in viscosity of a liquid with different concentrations (volume fractions) of suspended particles has been measured using a differential viscometer. The results support the recently introduced concept of gelation, in that the viscosity first diverges when the concentration of suspended particles reaches a critical value, and `gelation' comes after that.

Viscosity divergence and gelation

“…Realizing the difficulty in ascertaining the concentration of suspended clusters in gamma irradiated PDMS, we plan to measure viscosity change with varying concentration of suspended particles homogeneously mixed in PDMS. Experiments (Halder et al, 1995(Halder et al, , 1997 performed by measuring the change in viscosity in PDMS with varying concentrations of suspended particles of silicon and glass powder confirms the validity of Eq. (2).…”

“…The model has been tested and found to be true by separate experiments carried out with different concentrations of suspended particles in silicone fluid and measuring change in viscosity at each concentration. The model has been established on physical arguments using RRN model and is a simple way to include hydrodynamic interactions of suspended (1) to the data (Source: Halder et al (1997)). …”

“…This is commonly known as the random resistance network (RRN) model. Our model has been tested to be true by separate experiments by mixing fine powders of silicon and glass in PDHMS and measuring the change in viscosity (Halder et al, 1997). In other words, we differentiate two types of gels: inelastic gel which does not have shear elasticity but is immobile due to largeness of viscosity and the other is the conventional elastic gel which occurs at a much higher dose after the formation of inelastic gel.…”

Rheology and nano-crystallization of a Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass

“…(3) the value of c is related to hydrodynamic interaction between the particles. It is found to range from 2 [10] to 0.36 [15]. A plot of the relative viscosity versus volume fraction for three values of c is shown in Fig.…”

Constitutive Rheological Modeling of Flow Serration Behaviour in Metallic Glasses Showing Nanocrystallization during Deformation

“…As suggested in our previous work, shear bands can act as semisolid MG slurries since, as discussed in step 1, shear in metallic glasses generates free volume and heat, reduces viscosity, and leads to liquid-like behaviour in the shear bands with a possible rise in temperature. Under these conditions, the increase of the amount of nanocrystals in the shear zone can dramatically increase viscosity according to the correlation between viscosity and the fraction of nanocrystal solids (for semisolid behaviour) [54][55][56]…”