TEMPERATURE EFFECTS IN ULTRASONICALLY ACTIVATED CHEMICAL-REACTIONS

The temperature effects on the yield of a sonoactivated model reaction has been investigated, to establish the role played by some physical parameters in determining either the resonant conditions for ultrasonic cavitation as well as the related enhancement of reaction rate in sonochemistry. It has been found that the statical pressure at which the resonant phenomena occur increases straightly with temperature and is related to the «resonant volume» of the cavitating bubbles, at a given frequency of the ultrasounds. Comparison with our previous results confirms the possibility of driving the liquid-phase reacting system into resonant conditions, by varying the static pressure and/or the temperature, thus increasing the reaction rate and yield of the model chemical reaction chosen, i.e. the KMnO4 oxidation of indane to indan-1-one. © 1990 Società Italiana di Fisica.