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

Flannigan, David J.; Suslick, Kenneth S.

doi:10.1121/1.1897810

Cited by 23 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although the use of noble gases is nearly ubiquitous in SL studies, emission from electronically excited noble-gas atoms was not observed until our recent work in mineral acids (22,87). The observation of emission lines from noble-gas atoms, especially Ne and Ar whose excited states are 10 to 20 eV above the ground state, strongly suggests that a plasma was formed and was at least partly responsible for the light emission.…”

Section: Temperatures During Single-bubble Sonoluminescencementioning

confidence: 91%

“…In addition, the light flash from a single bubble in a shake tube of H 3 PO 4 was found to comprise up to 10 12 photons, a factor of roughly one million larger than that observed from water (71). Spectral analyses of SBSL from H 2 SO 4 revealed emission lines from atoms, molecules, and ions originating from the liquid and from gas dissolved in the liquid (Figure 7) (87,88). The observation of emission lines from ions provided the first definitive experimental evidence for the generation of a plasma during SBSL.…”

Section: Temperatures During Single-bubble Sonoluminescencementioning

confidence: 95%

See 1 more Smart Citation

Inside a Collapsing Bubble: Sonoluminescence and the Conditions During Cavitation

Suslick

Flannigan

2008

Annu. Rev. Phys. Chem.

Self Cite

563

327

View full text Add to dashboard Cite

Acoustic cavitation, the growth and rapid collapse of bubbles in a liquid irradiated with ultrasound, is a unique source of energy for driving chemical reactions with sound, a process known as sonochemistry. Another consequence of acoustic cavitation is the emission of light [sonoluminescence (SL)]. Spectroscopic analyses of SL from single bubbles as well as a cloud of bubbles have revealed line and band emission, as well as an underlying continuum arising from a plasma. Application of spectrometric methods of pyrometry as well as tools of plasma diagnostics to relative line intensities, profiles, and peak positions have allowed the determination of intracavity temperatures and pressures. These studies have shown that extraordinary conditions (temperatures up to 20,000 K; pressures of several thousand bar; and heating and cooling rates of >10(12) K s(1)) are generated within an otherwise cold liquid.

show abstract

Section: Temperatures During Single-bubble Sonoluminescencementioning

confidence: 91%

Section: Temperatures During Single-bubble Sonoluminescencementioning

confidence: 95%

Inside a Collapsing Bubble: Sonoluminescence and the Conditions During Cavitation

Suslick

Flannigan

2008

Annu. Rev. Phys. Chem.

Self Cite

563

327

View full text Add to dashboard Cite

show abstract

“…Due to their high emission power, noble gas bubbles in acids are ideal candidates for sonoluminescence studies, and the literature on such experiments is continuously growing. For SL in H 2 SO 4 , see for instance [8,9,10,11,12,13,14,15,16,18,17,19,20,21,22,23,24,25,26,27]. The basic mechanism of light emission in the acids is believed to be similar to that observed in other liquids like water (see e.g.…”

Section: Introductionmentioning

confidence: 89%

Sonoluminescence and dynamics of cavitation bubble populations in sulfuric acid

Thiemann

Holsteyns

Cairós

et al. 2017

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

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.

show abstract

“…Hydrodynamic calculations by Kamath and co-workers suggest that a heated-liquid shell mechanism is unlikely to dominate [33]. Figure 2 shows M-SBSL spectra obtained at high acoustic driving pressure (apparent P a 5:4 bar [34,35]) from H 2 SO 4 solutions of alkali-metal salts. The spectra show strong emission from excited alkali-metal atoms and an underlying continuum, the radiant power ( SL ) of which increases from the near-IR to mid-UV with a broad peak at 270 nm.…”

mentioning

confidence: 99%

Emission from Electronically Excited Metal Atoms during Single-Bubble Sonoluminescence

Flannigan

Suslick

2007

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

Variations in sonoluminescence (SL) from an acoustically driven but rapidly translating bubble in solutions of sulfuric acid with alkali-metal salts coincide with variations in translational bubble dynamics. At low acoustic pressures, emission from Ar excited states is observed and the bubble motion is smooth and elliptical. At elevated acoustic pressures, SL intensity decreases, emission from excited alkali-metal atoms is observed, and the bubble motion becomes increasingly erratic with frequent and abrupt changes in direction. These results provide a direct experimental link between single and multibubble SL and point toward the origins of sonochemical reactivity of nonvolatile species.

show abstract

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

Cited by 23 publications

References 13 publications

Inside a Collapsing Bubble: Sonoluminescence and the Conditions During Cavitation

Inside a Collapsing Bubble: Sonoluminescence and the Conditions During Cavitation

Sonoluminescence and dynamics of cavitation bubble populations in sulfuric acid

Emission from Electronically Excited Metal Atoms during Single-Bubble Sonoluminescence

Contact Info

Product

Resources

About