Single Bubble Sonochemistry

Lepoint, T.; Lepoint-Mullie, Françoise; Henglein, A.

doi:10.1007/978-94-015-9215-4_23

Cited by 18 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, pH meters are probably not sensitive enough to detect an effect even if the experiment is run for a long time. Therefore Lepoint et al (1999) exchanged the water in the experiment for Weissler's reagent. The oscillating bubble produced peroxide and chlorine radicals which oxidized iodide to iodine, giving the distinct blue color of the iodine-starch reaction.…”

Section: The Mechanismmentioning

confidence: 99%

Single-bubble sonoluminescence

2002

View full text Add to dashboard Cite

Single-bubble sonoluminescence occurs when an acoustically trapped and periodically driven gas bubble collapses so strongly that the energy focusing at collapse leads to light emission. Detailed experiments have demonstrated the unique properties of this system: the spectrum of the emitted light tends to peak in the ultraviolet and depends strongly on the type of gas dissolved in the liquid; small amounts of trace noble gases or other impurities can dramatically change the amount of light emission, which is also affected by small changes in other operating parameters (mainly forcing pressure, dissolved gas concentration, and liquid temperature). This article reviews experimental and theoretical efforts to understand this phenomenon. The currently available information favors a description of sonoluminescence caused by adiabatic heating of the bubble at collapse, leading to partial ionization of the gas inside the bubble and to thermal emission such as bremsstrahlung. After a brief historical review, the authors survey the major areas of research: Section II describes the classical theory of bubble dynamics, as developed by Rayleigh, Plesset, Prosperetti, and others, while Sec. III describes research on the gas dynamics inside the bubble. Shock waves inside the bubble do not seem to play a prominent role in the process. Section IV discusses the hydrodynamic and chemical stability of the bubble. Stable single-bubble sonoluminescence requires that the bubble be shape stable and diffusively stable, and, together with an energy focusing condition, this fixes the parameter space where light emission occurs. Section V describes experiments and models addressing the origin of the light emission. The final section presents an overview of what is known, and outlines some directions for future research. CONTENTS

show abstract

Section: The Mechanismmentioning

confidence: 99%

Single-bubble sonoluminescence

2002

View full text Add to dashboard Cite

show abstract

“…Recent publications have provided evidence for the generation of radicals and chemical (reaction) products during single-bubble cavitation (29)(30)(31). Although chemical reactions during single-bubble cavitation may be interesting in order to understand the ''science'' involved in the actual quantities of material produced is very small.…”

Section: 2mentioning

confidence: 99%

“…Sonochemical reactions can occur under single or multibubble cavitation conditions, but almost all are carried out with the latter since sonochemical reactions in baths or with horns are always multibubble. A very small number of studies have provided evidence for the generation of radicals and chemical (reaction) products during single-bubble cavitation (29)(30)(31). However, for practical applications, it is only the chemical reactions generated during multibubble cavitation that should be considered.…”

Section: Sonochemistrymentioning

confidence: 99%

Sonochemistry

Ashokkumar¹,

Mason²

2007

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

Sonochemistry is a relatively new term that arrived on the scene in the late 1970s and was then simply defined as the uses of ultrasound in chemistry and processing. Ultrasound is part of the overall sound spectrum, but is generally classified as sound beyond the frequency that can be detected by the human ear. Sometimes called “silent sound” it ranges from 20 kHz to 10 MHz within which it can be roughly subdivided into three main regions: low frequency, high power ultrasound (20–100 kHz); intermediate frequency, medium power ultrasound (100 kHz–1 MHz); and high frequency, low power ultrasound (1–10 MHz). The range from 20 kHz to 1 MHz is generally used in sonochemistry, whereas frequencies > 1 MHz are more commonly used in nondestructive testing and medicine. The driving force for sonochemistry is acoustic cavitation, which is the formation of small cavities in a fluid produced by ultrasound that undergo highly energetic collapse. A number of text books have been published that explore different aspects of sonochemistry. This article aims to provide the readers with a fundamental understanding of acoustic cavitation and its associated physical and chemical effects. Detailed information on the events that are involved in acoustic cavitation is discussed in the first section. Among the major effects generated by acoustic cavitation is Sonoluminescence and Sonochemistry, but only brief information is provided on the former since it is not the primary focus of this article. The majority of the discussion is focused upon Sonochemistry within which reactions have been subdivided into different categories, as suggested in the literature. Although sonochemistry is useful for a variety of applications, two areas that are particularly prominent are materials synthesis and the degradation of organic pollutants.

show abstract

“…The robustness of the microreactor hypothesis should be tested by applying the theory to search for other regimes (fluids and gas mixtures) that might yield stable SBSL. Parenthetically, recent evidence of chemical activity from SBSL was found by using the Weissler reaction, where a precipitation of iodide emanated from the vicinity of the sonoluminescence bubble (Lepoint & Lepoint-Mullie 1998). In this paper we have looked at SBSL from the perspective of bubble dynamics, and only explored a small portion of the experiments (and none of the theories) that have recently been published.…”

Section: Future Perspectives Of Sbslmentioning

confidence: 99%

Inertial cavitation and single–bubble sonoluminescence

Matula

1999

Philosophical Transactions of the Royal Society of London. Seri

106

View full text Add to dashboard Cite

Sonoluminescence is investigated experimentally from the perspective of the dynamics of a single inertial cavitation bubble levitated in an acoustic sound field. The discussion includes bubble levitation, the inertial cavitation threshold, the parameter space in which stable single-bubble sonoluminescence is observed, measurements of the acoustic and electromagnetic emissions from a sonoluminescence bubble, and the effects of impurities on the quality of the light emission from sonoluminescence bubbles. Comparisons are also made between sonoluminescence from a single bubble and sonoluminescence from a cavitation field.

show abstract

Single Bubble Sonochemistry

Cited by 18 publications

References 18 publications

Single-bubble sonoluminescence

Single-bubble sonoluminescence

Sonochemistry

Inertial cavitation and single–bubble sonoluminescence

Contact Info

Product

Resources

About