Temperature Nonequilibration during Single-Bubble Sonoluminescence

Flannigan, David J.; Suslick, Kenneth S.

doi:10.1021/jz301100j

Cited by 15 publications

(7 citation statements)

References 35 publications

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“…It is also clear that the temperature within a bubble is not an equilibrium temperature, based on studies from singlebubble and multibubble emissions. 6,7 In addition, light emission from vibronically excited states of a variety of molecular entities may also be produced, 7−11 to varying extents, depending on the fluid and the gases present in the system as well as the intensity of the sound field in operation. 5 Solutes can also exert considerable influence on the intensity of multibubble sonoluminescence (MBSL) generated in a fluid.…”

Section: ■ Introductionmentioning

confidence: 99%

“…It is now well-established that the emission of light that comes from liquids exposed to ultrasound is associated with the generation and the rapid collapse of microbubbles in the fluid. − The results from the most recent theoretical studies of this phenomenon have concluded that the genesis of the emission stems from the near adiabatic heating of the gas/vapor inside the bubble during its collapse. , The high local temperatures realized on bubble collapse lead to a partial ionization (plasma) of the gas/vapor inside the bubble followed by recombinant electron–ion radiative emission and bremsstrahlung. It is also clear that the temperature within a bubble is not an equilibrium temperature, based on studies from single-bubble and multibubble emissions. , In addition, light emission from vibronically excited states of a variety of molecular entities may also be produced, − to varying extents, depending on the fluid and the gases present in the system as well as the intensity of the sound field in operation …”

Section: Introductionmentioning

confidence: 99%

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Multibubble Sonoluminescence in Ethylene Glycol/Water Mixtures

2013

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The multibubble sonoluminescence (MBSL) signals generated by 3.5 ms pulses of 515 kHz ultrasound in air-saturated ethylene glycol, water, and ethylene glycol/water mixtures were examined in the absence and presence of a range of solutes, including aliphatic alcohols of various chain lengths (C3-C6) and ionic and zwitterionic surfactants. In general, the alcohols quenched the SL in most solvent mixtures and the surfactants enhanced the sonoluminescence signal. However, in some solvent mixtures complex effects were observed in the presence of the solutes. The discussion presented rationalizes the varied behavior of the solutes on the MBSL observed in terms of their influence on inter- and intrabubble effects experienced by bubbles in an ultrasound field.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multibubble Sonoluminescence in Ethylene Glycol/Water Mixtures

2013

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“…The first is that T r for SO is not equal to T v (also previously reported in an initial communication of this work). 44 Rather, it is found to be near the bulk liquid temperature. The second is that the observed SO rovibronic emission spectrum is best-fit with a non-Boltzmann vibrational level population distribution (Figure 3).…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Non-Boltzmann Population Distributions during Single-Bubble Sonoluminescence

Flannigan

Suslick

2013

J. Phys. Chem. B

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Single-bubble sonoluminescence (SBSL) spectra from aqueous sulfuric acid solutions containing dissolved neon show widely varying emission despite being similar in chemical composition. From a 65 wt % solution, emission from hydroxyl radicals is observed, with the rovibronic progression being well-described by a single temperature of 7600 K. From an 80 wt % solution, however, emission spectra reveal vibrationally hot sulfur monoxide (SO; Tv = 2400 K) that is also rotationally cold (Tr = 280 K). Further, the SO vibrational population distribution is best-described by a non-Boltzmann distribution. Excited neon atom emission observed from the 80 wt % solution gives an estimated temperature of only 3400 K, indicative of emission from a cool outer shell at the interfacial region. The neon atom excited-state population is also best-described by a non-Boltzmann distribution. These observations are consistent with SBSL emission having both a spatial and temporal component, and the implications for these effects are discussed.

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“…A pressure of 5 Â 10 3 atm at 10 4 K of the hot gas phase interior was estimated for the first time by calculating the half widths of D sodium emission lines. 25 Various approaches based on SL spectral observation were developed to find out the temperature and pressure of cavitation, 26,27 its energy efficiency 28 and prove the plasma existence. 29 Common liquid bulk solutions for SL studies contained dissolved noble gases or air.…”

Section: Introductionmentioning

confidence: 99%

Single bubble perturbation in cavitation proximity of solid glass: hot spot versus distance

Radziuk

Möhwald

Suslick

2014

Phys. Chem. Chem. Phys.

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A systematic study of the energy loss of a cavitation bubble in a close proximity of a glass surface is introduced for the first time in a low acoustic field (1.2-2.4 bar). Single bubble sonoluminescence (SBSL) is used as a tool to predict the temperature and pressure decrease of bubble (μm) versus surface distance. A glass as a model system is used to imitate the boundary conditions relevant for nano- or micromaterials. SBSL preequilibrated with 5% argon is perturbed by a glass rod with the tip (Z-perturbation) and with the long axis (X-perturbation) at a defined distance. From 2 mm to 500 μm argon-SBSL lines monotonically narrow and the effective emission temperature decreases from 9000 K to 6800 K comparable to multiple bubbles. The electron density decreases by two orders of magnitude in Z-perturbation and is by a factor of two higher in X-perturbation than the unperturbed cavitating bubble. The perturbed single bubble sonoluminescence pressure decreases from 2700 atm to 1200 atm at 2.4 bar. In water new non-SBSL SiO molecular emission lines are observed and OH emission disappears.

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Temperature Nonequilibration during Single-Bubble Sonoluminescence

Cited by 15 publications

References 35 publications

Multibubble Sonoluminescence in Ethylene Glycol/Water Mixtures

Multibubble Sonoluminescence in Ethylene Glycol/Water Mixtures

Non-Boltzmann Population Distributions during Single-Bubble Sonoluminescence

Single bubble perturbation in cavitation proximity of solid glass: hot spot versus distance

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