Foam properties and stabilizing mechanism of sodium fatty alcohol polyoxyethylene ether sulfate-welan gum composite systems

- The foam stability of composite system is better than for either single component.
- There exist optimum foaming concentrations for AES and welan gum.
- A network structure is formed in the AES/welan gum composite system.
- High interfacial elasticity is required to stabilize the interfacial layer.