Temperature Inhomogeneity during Multibubble Sonoluminescence

Xu, Hangxun; Glumac, Nick; Suslick, Kenneth S.

doi:10.1002/anie.200905754

Cited by 40 publications

(28 citation statements)

References 43 publications

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“…(ii) The different types of bubble dynamics in our system correspond well to the conjecture by Xu et al who determined distinct emission temperatures of two different emitting species in phosphoric acid [56]. Their conclusion was that the observed optical spectrum was a composition of the emissions of different bubbles or bubbles under different conditions (spherical and hotter collapse vs. non-spherical and colder collapse).…”

Section: Discussionsupporting

confidence: 88%

“…The higher continuum in the blue region might be attributed to higher temperatures in the bubbles (compare Xu et al [56] for measurements in phosphoric acid). However, since we do not see black body shaped spectral curves nor capture suitable emission bands in our observed window of wavelength, estimates of temperatures are not feasible.…”

Section: Optical Spectramentioning

confidence: 97%

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Sonoluminescence and dynamics of cavitation bubble populations in sulfuric acid

Thiemann

Holsteyns

Cairós

et al. 2017

Ultrasonics Sonochemistry

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The detailed link of liquid phase sonochemical reactions and bubble dynamics is still not sufficiently known. To further clarify this issue, we image sonoluminescence and bubble oscillations, translations, and shapes in an acoustic cavitation setup at 23kHz in sulfuric acid with dissolved sodium sulfate and xenon gas saturation. The colour of sonoluminescence varies in a way that emissions from excited non-volatile sodium atoms are prominently observed far from the acoustic horn emitter ("red region"), while such emissions are nearly absent close to the horn tip ("blue region"). High-speed images reveal the dynamics of distinct bubble populations that can partly be linked to the different emission regions. In particular, we see smaller strongly collapsing spherical bubbles within the blue region, while larger bubbles with a liquid jet during collapse dominate the red region. The jetting is induced by the fast bubble translation, which is a consequence of acoustic (Bjerknes) forces in the ultrasonic field. Numerical simulations with a spherical single bubble model reproduce quantitatively the volume oscillations and fast translation of the sodium emitting bubbles. Additionally, their intermittent stopping is explained by multistability in a hysteretic parameter range. The findings confirm the assumption that bubble deformations are responsible for pronounced sodium sonoluminescence. Notably the observed translation induced jetting appears to serve as efficient mixing mechanism of liquid into the heated gas phase of collapsing bubbles, thus potentially promoting liquid phase sonochemistry in general.

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Section: Discussionsupporting

confidence: 88%

Section: Optical Spectramentioning

confidence: 97%

Sonoluminescence and dynamics of cavitation bubble populations in sulfuric acid

Thiemann

Holsteyns

Cairós

et al. 2017

Ultrasonics Sonochemistry

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show abstract

“…Xu et al [48] in H 3 PO 4 under He, where fitting of OH(A 2 R + -X 2 P) emission lead to a temperature of 9500 K, while that of PO (B 2 R + -X 2 P) lead to a temperature of 4000 K.…”

Section: Sonoluminescence As a Probe Of Intrabubble Conditionsmentioning

confidence: 99%

Toward a new paradigm for sonochemistry: Short review on nonequilibrium plasma observations by means of MBSL spectroscopy in aqueous solutions

Nikitenko

Pflieger

2017

Ultrasonics Sonochemistry

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This review summarizes recent studies of multibubble sonoluminescence (MBSL) in aqueous media in order to highlight new insights into the origin of the sonochemical activity. The observation of OH(CΣ-AΣ) emission band and a spectroscopic analysis of OH(AΣ-XΠ) emission band in MBSL of water pre-equilibrated with noble gases revealed the formation of a nonequilibrium plasma inside the collapsing bubble (T>T>T, where T is an electron temperature, T is a vibrational temperature and T is a rotational (gas) temperature). The T and T estimated using OH(AΣ-XΠ) emission band increase with ultrasonic frequency. In Xe the T of OH(AΣ) state is much higher than in Ar most probably due to the lower ionization potential of Xe. The MBSL of C Swan band (dΠ-aΠ) measured in aqueous tert-butanol (t-BuOH) solutions correlates with the data obtained for OH(AΣ-XΠ) emission band. Analysis of the gaseous products of t-BuOH sonolysis revealed a significant sonochemical activity even at high t-BuOH concentration when MBSL is totally quenched, indicating that drastic intrabubble conditions (plasma) are not necessarily accompanied by sonoluminescence. The nonequilibrium plasma model of cavitation allows to explain the reverse carbon isotope effect observed during the sonolysis of water in the presence of Ar/CO gas mixture.

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“…Other aspects of mechanoluminescence, such as those involved in the milling of crystals, displacement of metal oxide lattices [42], triboluminescence from complexes [43][44][45][46][47][48], and sonoluminescence [49][50][51][52][53][54][55][56][57] are well known and important fields, but they will not be discussed here. And for a more comprehensive coverage of the field of polymer mechanochemistry, the reader is referred to several recent outstanding reviews [3,11,26,[58][59][60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Recent advances in mechanoluminescent polymers

Yuan

Chen

2016

Sci. China Mater.

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In recent years, mechanoluminescence from polymers is emerging as a new cutting-edge area of polymer mechanochemistry research. It refers to the release of energy from polymers in the form of light when they are under various mechanical stimuli. To spur more researchers to join in such interesting and new burgeoning area, and promote its development to practical applications, in this review, we try to briefly summarize the recent advances in mechanoluminescent polymers with the aspects of non-covalent, covalent, and cascade reactions systems. We pay much attention on the applications of such polymer systems in molecular level failure and stress sensors, and give a perspective of their potential applications in novel energy conversion materials and devices, as well as self-healing materials.

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Temperature Inhomogeneity during Multibubble Sonoluminescence

Cited by 40 publications

References 43 publications

Sonoluminescence and dynamics of cavitation bubble populations in sulfuric acid

Sonoluminescence and dynamics of cavitation bubble populations in sulfuric acid

Toward a new paradigm for sonochemistry: Short review on nonequilibrium plasma observations by means of MBSL spectroscopy in aqueous solutions

Recent advances in mechanoluminescent polymers

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