Stability and rheology of foams containing microbial polysaccharide and particles of silica and bentonite clay

Effect of bentonite slurry on the function of foam for changing the permeability characteristics of sand under high hydraulic gradients

“…On the other hand, fine bentonite particles are adsorbed at the air-liquid interface of foam bubbles, increasing the flow resistance of water on the foam film (Zhao et al 2016;Guillermic et al 2009). In addition, the existence of bentonite particles on the foam film and the permeability channels parallel to the surface of the foam film hinder air exchange between foam bubbles, slowing down the coarsening and dissipation of foam (Erasov et al 2015). For example, with P=1.9 m, w=10%, and FIR=10%, the growth rate of the permeability coefficient decreased from 4.93×10 -7 m/s to 4.08×10 -7 m/s per hour for sand with an increase in the BIR from 5% to 10%.…”

“…With contact between small and large foam bubbles, the air in small bubbles entered the large bubbles through the foam film, and foam coarsening occurred. However, with the addition of bentonite slurry, fine bentonite particles occurred between the liquid film of the foam bubbles and formed a steric barrier to limit liquid film drainage to the plateau channels and prevent the foam from coarsening or dissipating (Erasov et al 2015). Two mechanisms of stabilizing foam by bentonite particles are as follows.…”

Hydrophobisation of Silica Nanoparticles Using Lauroyl Ethyl Arginate and Chitosan Mixtures to Induce the Foaming Process

“…Carbon particles can also initially stabilise foam and later destroy it with ultraviolet radiation [ 38 ]. The viscoelastic response of particle-stabilised foams is different from that of classic foams [ 33 , 39 ], which typically show viscous behaviour without an elastic modulus or yield stress. The presence of yield stress in particle-laden foams is connected with the irreversible attachment of the particles to the foam film surfaces.…”

“…The variations in the viscoelasticity with the solid volume fraction were in qualitative agreement with that predicted by an effective medium rigidity particle concentration model. The network of uniform and equal springs relevant for classical foams was transformed into another structure consisting of very strong springs generated by rigid bonds between particles [ 33 , 39 ]. It was also found that there is a maximum concentration of particles above which the viscoelastic properties are no longer improved.…”