Influence of cations on foaming characteristics and interfacial properties of sodium dodecyl sulfate

Abstract

Metal cations are one of the important factors affecting the performance of anionic foaming agent.In this paper,based on the different metal cations with sodium dodecyl sulfate (SDS) solution system,the influence of cations on foaming characteristics and interfacial properties of sodium dodecyl sulfate were investigated.The foaming ability and foam stability of different SDS solution systems were analyzed by foam scanner. The foam morphology,diameter and distribution were statistical analyzed by image analysis method.By utilizing of interfacial tension/rheometer,and the interfacial viscoelasticity were tested.The results showed that the cations can reduce the foaming ability and the influence order is Al3+ > Mg2+ > Na+.The half-life of foam decreased firstly and then tends to be gently with the increase concentration of Mg2+ and Na+,but the half-life of foam decreased firstly and then increased,finally tends to be gentle with the increase of Al3+.The adverse effect of Al3+ on the foam structure is much larger than that of Na+ and Mg2+.The ability of Al3+ which reduce the foam diameter significantly.The composite solution surface is viscoelastic,and the effects of cations on dilational modulus is Al3+ > Mg2+ > Na+.

Keywords

• sodium dodecyl sulfate
• foaming property
• half-life
• dilational modulus