Colloidal Properties of Mixed Solutions of Anionic and Cationic Surfactants

Fabrication of vesicles from mixed cationic/anionic surfactants with additives

In this study, positively charged catanionic vesicles were fabricated from an ion pair amphiphile (IPA), hexadecyltrimethylammonium-dodecylsulfate (HTMA-DS), with the addition of a double-chained cationic surfactant, ditetradecyldimethylammonium bromide (DTDAB), and cholesterol by a mechanical dispersion process. The effects of the added cholesterol on physical stability of the catanionic vesic...

Interactions between cationic starch and mixed anionic surfactants

The interactions of cationic starch (CS, degree of substitution=0.8)/mixed anionic surfactant/water systems were investigated. The surfactants investigated were sodium dodecyl sulphate (SDS), sodium octanoate (NaOct), sodium decanoate (NaDe), sodium dodecanoate (NaDod), sodium oleate (NaOl ) and sodium erucate (NaEr). The concentration of CS varied from 0.001 to 10 wt.%. The effect of mixing on...

Interactions between Cationic Starch and Anionic Surfactants

Transitions of organized assemblies in mixed systems of cationic bolaamphiphile and anionic conventional surfactants.

The transition from vesicles to tubelike structures has been studied in mixed systems of cationic bolaamphiphile BPHTAB [biphenyl-4,4'-bis(oxyhexamethylenetrimethylammonium bromide)] and its oppositely charged conventional surfactants with transmission electron microscopy (TEM) and dynamic light scattering (DLS). This transition can be attributed to the fact that tube-like structures are more s...

Microstructure and Dynamics of Wormlike Micellar Solutions Formed by Mixing Cationic and Anionic Surfactants

Small-angle neutron scattering (SANS) and rheology are used to probe the wormlike micelles formed in mixtures of a cationic (cetyl trimethylammonium tosylate, CTAT) and an anionic surfactant (sodium dodecyl benzene sulfonate, SDBS). For a fixed composition of 97/3 CTAT/SDBS, the zero-shear viscosity η0 initially increases rapidly with surfactant concentration, but decreases beyond an intermedia...