Small Angle Neutron Scattering and Viscosity Measurements on Silicone, Ionic, and Nonionic Surfactant Mixed Systems in Aqueous Solutions

Abstract

The structural features of mixed micelles of a silicone surfactant (SS-1) with a comb-like structure, and three hydrocarbon surfactants (HS), sodium dodecyl sulfate, SDS, tetradecyl trimethylammonium bromide, DTAB, and t-octylphenoxy polyethoxyethanol, TX-100 in water were investigated using dilute solution phase characteristics, small angle neutron scattering (SANS) and solution viscosity measurements. The surfactants interact with the SS-1 micelles leading to the formation of highly hydrophilic complexes. The enhanced hydrophilicity shifts the unimer ↔ micelle in favor of former. The reduced viscosities of the mixed systems of SS-1—ionic surfactants in the very low SS-1 concentrations were high and show a curvature suggesting strong repulsive interactions among the complexes. The intrinsic viscosity of mixture solutions are more than the SS-1 micellar solutions indicating enhanced hydration. The hydrophilicity increased the cloud points of SS-1 in simple surfactants.

Keywords:

• Destabilization of micelles
• dilute solution phase characteristics
• hydrocarbon surfactants
• SANS
• silicone surfactant
• viscosity

Acknowledgments

The authors thank the UGC-DAE Consortium for Scientific Research. This work was done under Collaborative Research Scheme (Grant No. IUC/AO/MUM/CRS M-108/03/2581) of UGC-DAE CSR.

Notes

*The association numbers obtained was too high and hence model was not considered.

^a [23].

^b [24].

^c [21].

^d [25].

^e [22].

**No data can be obtained because solutions were founds turbid.

Additional information

Notes on contributors

S. H. Punjabi

S. H. Pubjabi is currently affiliated with the Department of Chemistry, NV Patel College of Pure and Applied Sciences, Vallabh Vidyanagar, Gujarat, India.