Theoretical study of the ambient-pressure dependence of sonochemical reactions

Abstract

A study on measurement technique for amount of generated acoustic cavitation-investigation of broadband integrated voltage by comparing with sound pressure and sonochemical luminescence-AIP Conf.The range of ambient radius for an active bubble in sonoluminescence and sonochemical reactions

The ultrasonic electropolymerization of an 5-[o-(4-bromine amyloxy)phenyl]-10,15,20-triphenylporphrin (o-BrPETPP) film electrode and its electrocatalytic properties to dopamine oxidation in aqueous solution

“…The electrical properties of porphyrin film are based on their unique structure with conjugated and highly delocalized -bonds; therefore, the electropolymerization degree is crucial to its conductivity. As reported previously [17], OH radicals and other oxidants may be created in the cavitation bubbles and dispersed in the liquid solution to induce various reactions. Thus, the above differences in CV curves can mainly be ascribed to the influence of ultrasonic irradiation, which changed the electrosynthesis conditions and subsequently modified the microstructure of the as-formed o-BrPETPP film.…”

“…Considering the absence of metal ions in this porphyrin and the fact that a broad potential region is needed to actualize the polymerization, ultrasonic irradiation is applied during the electropolymerization process to form a compact functional film with high reactivity on the surface of the carbon substrate. In previous studies [15][16][17], it was reported that the application of ultrasound in a liquid medium allowed the generation of cavitation bubbles, which grow and collapse, greatly changing the pressure and temperature inside the bubbles. Thus, it appears the reactions take place inside bubbles.…”

The effect of ultrasonic irradiation during electropolymerization of polypyrrole on corrosion prevention of the coated steel

“…Due to the high temperature, many kinds of chemical reactions take place inside bubble as well as vaporization. For example, OH radicals and accompanied other oxidants can be created at the cavitation bubbles and dispersed in liquid solution to induce various reactions [21]. The above phenomena may change the synthesis or electrosynthesis conditions for the CP preparation to modify the structure of the CP films.…”

Enhancing the aggressive intensity of hydrodynamic cavitation through a Venturi tube by increasing the pressure in the region where the bubbles collapse

“…8 Furthermore, it has been reported that multibubble sonoluminescence induced by acoustic cavitation has a peak at a pressure lower than atmospheric 9 and a theoretical study of the effect of the ambient pressure on the sonochemical reaction has also been reported. 10 A system to generate acoustic cavitation at ambient pressures in excess of 30 MPa has been developed. 11 However, some studies have reported that the intensity of hydrodynamic cavitation could be increased with less energy compared with that required for acoustic cavitation.…”