ABSTRACT
Stabilization of aqueous foams or emulsions by various solid particles was noticed by researchers more than one hundred years ago. However, during the last century, researchers mostly focused on emulsions. Therefore, the "stabilization of foams by particles" is a relatively new subject in this discipline of science. People are still gathering new data and try to find general rules describing the stability and rheology of "particle-laden foams". The stabilization effects of rod-like particles are also connected with the lower three phase contact angle as compared with those for spherical particles. Some degree of hydrophobicity of particles is necessary to generate stable foams. This can be established by permanent or "in situ" methods. Highly hydrophilic particles do not attach on foam film surfaces but remain dispersed in the bulk of the foam films. However, partially hydrophilic particles can improve the stability of foam.
