The rheology of foams is a difficult subject due to the complexity of their structure and the nature of their components. It’s influenced by multiple factors including: liquid bulk properties, gas properties, air phase volume, liquid volume fraction, solution viscosity, interfacial thin film visco-elasticity, bubble size distribution, and bubble shape. A nature of the adsorbed surfactants or biosurfactants and state of adsorption layer also modified the properties of the thin liquid film. The physical measurements of foam rheological properties are also complicated by its inherently unstable nature. Therefore, this review is focused on rheological studies and comparisons between various surfactant based foams and biofoams having wellcharacterized and different properties.
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