Second Harmonic Generation Spectroscopy to Investigate Kinetics of Detergent Molecules Transferring between Emulsion Particles Elsa C. Y. Yan, Department of chemistry, Yale University. New Haven, CT 06520 Emulsion System
Transport Kinetics of Surfactant Molecules
Method: Second Harmonic Generation Spectroscopy • Surface/interface selectivity • In situ kinetic study
Oil Water • Oil industry: crude oil transportation and refinery • Environmental protection: oil spill cleanup • Drug industry: pharmaceutical formulation
Detergent and Emulsion
Results and Discussion
Oil phase: n-tetradecane
Oil
Aqueous phase: water Sodium dodecylsulfate 1-dodecanol
Water
MG, MG-octyl-1 or MG-butyl-1
Results: The transfer rate of MG is 5 time faster than that of MG-butyl-1 and the rate of MG-butyl-1 is ~700 times faster than that of MG-octyl-l. Conclusion: A combination of SHG spectroscopy, molecular design and synthesis of Sp introduces an in situ and real-time technique to study kinetics of detergent molecules transfer in colloidal emulsion systems. This method is expected to be useful for further investigations of molecular mechanism and energetics of the transfer process.
