Analysis of the ‘new electrical model’ of sonoluminescence

Lepoint-Mullie, Françoise; Pauw, Damien De; Lepoint, T.

doi:10.1016/1350-4177(95)00034-8

Cited by 22 publications

(10 citation statements)

References 17 publications

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“…However, this theory based on a double layer model has been the target of much criticism. 29,35,36 Perhaps the major objection lies in the fact that, hydrated electrons, e 2 (aq) , which would be generated by electrical discharge, have not been unambiguously detected. Solvated electrons may be formed by the interaction of high-energy radiation with liquids, the initial step being the production of ionized and excited solvent molecules.…”

Section: Temperatures Of Cavitationmentioning

confidence: 99%

Power ultrasound in organic synthesis: moving cavitational chemistry from academia to innovative and large-scale applications

2006

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Ultrasound, an efficient and virtually innocuous means of activation in synthetic chemistry, has been employed for decades with varied success. Not only can this high-energy input enhance mechanical effects in heterogeneous processes, but it is also known to induce new reactivities leading to the formation of unexpected chemical species. What makes sonochemistry unique is the remarkable phenomenon of cavitation, currently the subject of intense research which has already yielded thought-provoking results. This critical review is aimed at discussing the present status of cavitational chemistry and some of the underlying phenomena, and to highlight some recent applications and trends in organic sonochemistry, especially in combination with other sustainable technologies. (151 references.).

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Section: Temperatures Of Cavitationmentioning

confidence: 99%

Power ultrasound in organic synthesis: moving cavitational chemistry from academia to innovative and large-scale applications

2006

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“…However, Prosperetti (1997) has considered the effects of jet impingement upon the rear surface of the bubble and uses the concepts of 'fracture' of the liquid and solvation of rare-gas atoms into water as explanation for the light emission by fractoemission. Additionally Lepointmullie has hypothesized jet-breakup into droplets, charge separation and subsequent electrical discharge as being responsible for light emission (Lepointmullie et al . 1996).…”

Section: Introductionmentioning

confidence: 99%

Shock–induced collapse and luminescence by cavities

Bourne

Field²

1999

Philosophical Transactions of the Royal Society of London. Seri

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Recent observations of the collapse of single bubbles or clouds of cavities trapped within stationary acoustic fields have shown the production of light and these phenomena have been dubbed single-or multiple-bubble sonoluminescence. The experimental observation of the variations in the bubble radius with time, with simultaneous measurement of the light emission from the bubble, shows short pulses of light correlated closely with the point of minimum radius of the bubble. Results will be presented showing experimental observations of light produced from shock-collapsed cavities. The role of shock waves generated within the bubble by the motion of the walls will be discussed with application to the shock-wave hypothesis proposed as one of the mechanisms responsible for sonoluminescence. The likely asymmetry of the process, as recently proposed, and the consequent presence of a high-velocity jet will also be discussed. The effect of such 'hot' cavities within an explosive matrix is investigated and results are presented. The collapse of a single bubble shows that light emission from the explosive matrix is due to reaction caused by hydrodynamic heating by jet impact, not due to conduction from heated gas during compression. Similar results are seen in arrays of collapsing cavities. The effects of close, inert particles are discussed and an example is given.

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“…Along this line, Chowdhury 16 showed that variations of the luminescence of exciplex depends on the structure of the liquid and on the dielectric constant of the solvent. Moreover, Lepoint-Mullie et al 40 following the Gouy-Chapman model, infer that the dielectric constant of water is decreasing when approaching the surface of bubbles.…”

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confidence: 99%

Effects of pulsed low frequency electromagnetic fields on water using photoluminescence spectroscopy: Role of bubble/water interface

Vallée

Lafait

Mentré

et al. 2005

The Journal of Chemical Physics

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The effects of a pulsed low frequency electromagnetic field were investigated on photoluminescence of well characterized water and prepared under controlled conditions (container, atmospheric, electromagnetic, and acoustic environments). When reference water samples were excited at 260 nm, two wide emission bands centered at 345 nm (3.6 eV) and 425 nm (2.9 eV) were observed. By contrast under 310 nm excitation, only one band appeared at 425 nm. Interestingly, electromagnetic treatment (EMT) induced, at both excitation wavelengths, a decrease (around 70%) in the 425 nm band relative photoluminescence intensity. However, no difference between reference and treated sample was observed in the 345 nm band. Other experiments, performed on outgassed samples (reference and treated), show that the emission bands (position, shape, intensity) under excitation at 260 nm and 310 nm were similar and close to the corresponding bands of the treated nonoutgassed samples. Similar effects were observed on photoluminescence excitation of water samples. Two excitation bands monitored at 425 nm were observed at 272 nm and 330 nm. After EMT and/or outgassing, a decrease (> 60%) was observed in the intensity of these two bands. Altogether, these results indicate that electromagnetic treatment and/or outgassing decrease in a similar fashion the photoluminescence intensity in water samples. They also suggest that this effect is most likely indirectly attributed to the presence of gas bubbles in water. The possible role of hydrated ionic shell around the bubbles in the observed extraluminescence is discussed.

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Analysis of the ‘new electrical model’ of sonoluminescence

Cited by 22 publications

References 17 publications

Power ultrasound in organic synthesis: moving cavitational chemistry from academia to innovative and large-scale applications

Power ultrasound in organic synthesis: moving cavitational chemistry from academia to innovative and large-scale applications

Shock–induced collapse and luminescence by cavities

Effects of pulsed low frequency electromagnetic fields on water using photoluminescence spectroscopy: Role of bubble/water interface

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