A comparative sonochemical reaction that is independent of the intensity of ultrasound and the geometry of the exposure apparatus

摘要

Sonolysis of aqueous solutions of n-alkyl anionic surfactants results in the formation of secondary carbon-centered radicals (—^•CH—). The yield of —^•CH— depends on the bulk surfactant concentration up to a maximum attainable radical yield (the ‘plateau yield’) where an increasing surfactant concentration (below the critical micelle concentration) no longer affects the —^•CH— yield. In an earlier study it was found that the ratio of —^•CH— detected following sonolysis of aqueous solutions of sodium pentane sulfonate (SPSo) to that of sodium dodecyl sulfate (SDS) (i.e., CHSPSo/CHSDS) depended on the frequency of sonolysis, but was independent of the ultrasound intensity, at the plateau concentrations (J. Phys. Chem. B 106 (2002) 12537-12548). In the current study, it was found that the CHSPSo/CHSDS ratio depended only on the ultrasound frequency and did not depend on the geometry of the ultrasound exposure apparatus considered.