抄録
The effects of surfactant additives on the intensity of both sonoluminescence and sonochemical luminescence have been investigated. The surfactants are a cationic one of cetyltrimethylammonium bromide (CTAB) and an anionic one of sodium dodecyl sulfate (SDS). The intensity of luminescence was measured at various concentrations of the two surfactants while changing the driving frequency of ultrasound. In the intensity of sonoluminescence from distilled water, additives of the two surfactants had similar effects. At higher concentrations than the critical micelle concentration, the intensity was increased at a specific frequency of 129 kHz but decreased in the other frequency range. In the intensity of sonochemical luminescence from the luminol solution, quite different behavior between the two surfactants was observed. In the presence of 10 mM SDS, sonochemical luminescence due to chemical reaction of luminol was entirely shut out. Possible mechanisms resposible for the different behavior in the sonochemical luminescence are discussed.
