Sonoluminescence quenching in aqueous solutions of aliphatic diols and glycerol

Abstract

The multibubble sonoluminescence (MBSL) signals that were generated using 358 kHz ultrasound in aqueous solutions of ethylene glycol, 1,3-propanediol, 1,4-butanediol and glycerol, over a range of concentrations, have been studied. It was found that the intensity of the MBSL was either reduced or enhanced, relative to the signal in water, depending on the concentration of the solute. It was concluded that the reduction in the MBSL intensity was dependent on the strength of the intermolecular forces, in particular hydrogen bonding, between the solute molecules and water. The enhancement in the MBSL signal was ascribed to presence of the solute molecules at the bubble/solution interface that hinder the coalescence of the bubbles in the multibubble clouds produced at the antinodes in the system.

Reaction of Ferricyanide and Methyl Viologen with Free Radicals Produced by Ultrasound in Aqueous Solutions

“… a Calculated using surface tension (γ) data from refs − , and the Szyszkowski equation, γ 0 – γ = Γ m RT ln( K [alcohol] + 1), and a limiting area of 23 ± 4 Å 2 /alcohol molecule for the linear alcohols , and 32 ± 5 Å 2 /alcohol molecule for the branched alcohols b Ref . c Ref . …”

“…Consequently, on bubble implosion, more molecules are subjected to the extreme thermal conditions in the core and therefore more radicals are produced. (It is interesting to note that the specific volatility of the alcohols, which changes significantly with increasing alkyl chain length, does not seem to be a contributing factor. This is consistent with what we have previously found in our studies on both SL quenching by alcohols , and from the reduction of various metal ion complexes. − )…”

“…(It is interesting to note that the specific volatility of the alcohols, which changes significantly with increasing alkyl chain length, does not seem to be a contributing factor. This is consistent with what we have previously found in our studies on both SL quenching by alcohols , and from the reduction of various metal ion complexes. − )…”

Influence of Microbubbles on Free Radical Generation by Ultrasound in Aqueous Solution: Dependence of Ultrasound Frequency

“…It has been reported that the addition of alcohol to an aqueous solution greatly reduces sonoluminescence relative to that in pure water. − They suggested that alcohol adsorbs on the surface of bubbles and stabilizes the pulsation of bubbles. On the other hand, Sunartio et al .…”

The effect of ultrasound treatment in combination with nisin on the inactivation of Listeria innocua and Escherichia coli

“…As noted above, transient cavitation is believed to be one of the main mechanisms for microbial inactivation, thus the efficacy of inactivation treatment could be impacted. The effect of viscosity on bubble oscillation and cavitation has been investigated both theoretically and experimentally [36] , [37] , [38] , [39] , [40] , [41] , [42] , [43] . However, a systematic study on the effect of viscosity on ultrasound inactivation of bacteria has not yet been conducted.…”