Characterization and Aggregation Behaviors of Mixed DDAB/SDS Solution With and Without Poly(4-styrenesulfonic Acid-Co-Maleic Acid) Sodium

Abstract

Synthetic vesicles are formed by cationic and anionic surfactants, didodecyldimethylammonium bromide (DDAB), and sodium dodecylsulfate (SDS). The morphology, size, and aqueous properties of cationic/anionic mixtures are investigated at various molar ratios between cationic and anionic surfactants. The charged vesicular dispersions made of DDAB/SDS are contacted or mixed with negatively charged polyelectrolyte, poly(4-styrenesulfonic acid-co-maleic acid) sodium (PSSAMA), to form complexes. Depending on DDAB/SDS molar ratio or PSSAMA/vesicle charge ratio, complexes flocculation or precipitation occur. Characterization of the cationic/anionic vesicles or complexes formed by the catanionic vesicles and polyelectrolytes is performed by transmission electron microscope (TEM), dynamic light scattering (DLS), conductivity, turbidity, and zeta potential measurements. The size, stability, and the surface charge on the mixed cationic/anionic vesicles or complexes are determined.

Keywords:

• Catanionic vesicle
• complexes
• didodecyldimethylammonium bromide (DDAB)
• polyelectrolyte
• sodium dodecylsulfate (SDS)

Acknowledgements

This work is supported by National Natural Science Foundation of China (NSFC, No. 20803044 and 21173127) and the Natural Science Foundation of Shandong Province (ZR2011BQ003).

Notes

Note: τ₁ is measured for the freshly prepared samples; τ₂ is measured for the samples kept for 45 days.

Note: τ₁ is measured for the freshly prepared samples; τ₂ is measured for the samples kept for 45 days.