Sonoluminescence from Single Bubbles in Nonaqueous Liquids: New Parameter Space for Sonochemistry

Weninger, Keith; Hiller, Robert A.; Barber, Bradley P.; Lacoste, David; Putterman, Seth

doi:10.1021/j100039a001

Cited by 69 publications

(53 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference with the Weninger et al (1995) experiment in pure alcohols thus lies in the solubility of the chemical reaction products in the surrounding liquid, which is still almost pure water in the case of alcohol contamination experiments. Didenko et al (2000b) therefore sought ideal nonaqueous liquids for SBSL, requiring (i) a low vapor pressure to limit vapor invasion of the bubble and (ii) a high content of O or N heteroatoms to facilitate the chemical formation of species upon collapse that will readily dissolve in or react with the liquid phase.…”

Section: F Other Liquids and Contaminated Liquidsmentioning

confidence: 98%

“…While dissolved salts (Matula et al, 1995) or mixtures of water and freely miscible liquids do not prohibit stable SBSL, for years it could not be observed in other liquids, even though multibubble sonoluminescence in nonaqueous liquids had been known for a long time (see, for example, Suslick and Flint, 1987). Weninger et al (1995) showed that weakly emitting, unstable single sonoluminescing bubbles could be observed in pure alcohols, while the light of a stable SBSL bubble in water could be turned off by just adding a few drops of alcohol to the solution. The latter effect can be understood by recognizing that alcohols are surface active and tend to accumulate at the bubble surface.…”

Section: F Other Liquids and Contaminated Liquidsmentioning

confidence: 99%

See 1 more Smart Citation

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: F Other Liquids and Contaminated Liquidsmentioning

confidence: 98%

Section: F Other Liquids and Contaminated Liquidsmentioning

confidence: 99%

Single-bubble sonoluminescence

2002

View full text Add to dashboard Cite

show abstract

“…7 Due to the lack of features in the SBSL spectra of water, SBSL in other liquids could lead to valuable insights into the physical and chemical processes occurring during singlebubble cavitation. In fact, SBSL spectra from organic liquids 8,9 have been previously reported. Most recently, we have found concentrated sulfuric acid (H 2 SO 4 ) to be an extremely interesting and effective liquid for the study of SBSL.…”

Section: Introductionmentioning

confidence: 98%

Molecular and atomic emission during single- bubble cavitation in concentrated sulfuric acid

Flannigan

Suslick

2005

Acoustics Research Letters Online

View full text Add to dashboard Cite

“…Two experimental configurations for SL exist: multibubble sonoluminescence (MBSL) [1,2], which occurs in transient cavitation clouds, and single bubble sonoluminescence (SBSL), which occurs when a single bubble is trapped at the node of an applied acoustic field [3,4]. Recent experiments [3][4][5][6][7][8][9][10] uncovered many remarkable properties of SBSL, including picosecond light pulses [4,11] and sensitive dependences on almost all experimental parameters.…”

mentioning

confidence: 99%

“…To wit: While the shock theory is believed to work for both MBSL [13] and SBSL [14], the entire MBSL bubble cloud emits less than 1% of the light of a single bubble in SBSL. For SBSL in alcohols, Weninger et al [9] reported the existence of abrupt jumps in the light intensity, in which the light output changes by a factor of 400 with a 1 ± C change in the liquid temperature. More recently, Weninger et al [10] reported the existence of angular correlations in the light output, in which the radiation field had a significant dipole moment.…”

mentioning

confidence: 99%

Acoustic Energy Storage in Single Bubble Sonoluminescence

et al. 1996

View full text Add to dashboard Cite

Single bubble sonoluminescence is understood in terms of a shock focusing towards the bubble center. We present a mechanism for significantly enhancing the effect of shock focusing, arising from the storage of energy in the acoustic modes of the gas. The modes with strongest coupling are not spherically symmetric. The storage of acoustic energy gives a framework for understanding how light intensities depend so strongly on ambient gases and liquids and suggests that the light intensities of successive flashes are highly correlated.[ S0031-9007(96) Sonoluminescence (SL), the conversion of acoustic energy into light, occurs by coupling gaseous bubbles to an externally forced liquid [1]. Two experimental configurations for SL exist: multibubble sonoluminescence (MBSL) [1,2], which occurs in transient cavitation clouds, and single bubble sonoluminescence (SBSL), which occurs when a single bubble is trapped at the node of an applied acoustic field [3,4]. Recent experiments [3-10] uncovered many remarkable properties of SBSL, including picosecond light pulses [4,11] and sensitive dependences on almost all experimental parameters.SL requires both energy transfer from the liquid to the gas, and focusing of this energy. The shock theory stipulates that a shock focuses the energy input during a single collapse. Large temperatures occur because a focusing shock is a singular solution to the Euler equations [12] in which the maximum temperature diverges at the focusing point. Although this shock theory gives consistent explanations for many aspects of SL (e.g., high temperatures and picosecond light pulses), there is mounting experimental evidence that tensions in the theory exist. To wit: While the shock theory is believed to work for both MBSL [13] and SBSL [14], the entire MBSL bubble cloud emits less than 1% of the light of a single bubble in SBSL. For SBSL in alcohols, Weninger et al. [9] reported the existence of abrupt jumps in the light intensity, in which the light output changes by a factor of 400 with a 1 ± C change in the liquid temperature. More recently, Weninger et al. [10] reported the existence of angular correlations in the light output, in which the radiation field had a significant dipole moment. We believe that it is difficult to resolve these discrepancies within the single shock theory, and that additional physics is needed. This paper presents a mechanism for enhancing the effect of shock focusing, giving natural resolutions to the aforementioned tensions in the shock theory. The idea is that the energy focused in SBSL is not input in a single bubble collapse, but instead accumulates within the acoustic modes of the gas over many bubble cycles. Because the energy stored in the modes is far greater than the energy input in a single collapse, the focusing power of the shocks is significantly enhanced. (Note that the emitted light carries away very little energy, and merely acts as an indicator of the energy density at collapse [14].) Within this picture, the maximum temperature and light intensity of ...

show abstract

Sonoluminescence from Single Bubbles in Nonaqueous Liquids: New Parameter Space for Sonochemistry

Cited by 69 publications

References 0 publications

Single-bubble sonoluminescence

Single-bubble sonoluminescence

Molecular and atomic emission during single- bubble cavitation in concentrated sulfuric acid

Acoustic Energy Storage in Single Bubble Sonoluminescence

Contact Info

Product

Resources

About