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Sonoluminescence and Related Plasma Luminescence

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Ultrasound Chemistry".

Deadline for manuscript submissions: closed (31 August 2022) | Viewed by 7939

Special Issue Editor

Institute for Separation Chemistry, ICSM UMR5257 CEA, CNRS, Univ Montpellier, ENSCM, 30207 Marcoule, France
Interests: sonochemistry; sonoluminescence; emission spectroscopy; plasma; ultrasound-assisted depollution of solids

Special Issue Information

Dear Colleagues,

We are pleased to invite you to submit original articles or reviews to the Special Issue of Molecules entitled “Sonoluminescence and Related Plasma Luminescence.”

Apart from its fascinating aspect, sonoluminescence gives access to information on the plasma that forms inside collapsing cavitation bubbles, reveals the presence of particular excited active species, and can give hints on mechanisms of sonochemical reactions. Sonoluminescence spectroscopy also shows the similarities shared by the sonochemical plasma with other plasmas in liquids. The aim of this Special Issue is to present an overview of the current state of research in the field, stimulate inspiration across different fields, and offer the possibility of synergetic interdisciplinary scientific advancements.

We kindly invite and encourage you to submit your original articles or reviews.

Dr. Rachel Pflieger
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • sonochemistry
  • sonoluminescence
  • emission spectroscopy
  • acoustic cavitation
  • hydrodynamic cavitation
  • underwater electrical breakdown
  • plasma in liquid

Published Papers (4 papers)

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Research

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12 pages, 2235 KiB  
Article
Sonoluminescence Spectra in the First Tens of Seconds of Sonolysis of [BEPip][NTf2], at 20 kHz under Ar
by Rachel Pflieger, Manuel Lejeune and Micheline Draye
Molecules 2022, 27(18), 6050; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27186050 - 16 Sep 2022
Cited by 3 | Viewed by 1324
Abstract
Following recent works on the sonochemical degradation of butyl ethyl piperidinium bis-(trifluoromethylsulfonyl)imide ([BEPip][NTf2]), monitoring of sonoluminescence (SL) spectra in the first tens of seconds of sonolysis was needed to better characterize the formed plasma and to question the correlation of the [...] Read more.
Following recent works on the sonochemical degradation of butyl ethyl piperidinium bis-(trifluoromethylsulfonyl)imide ([BEPip][NTf2]), monitoring of sonoluminescence (SL) spectra in the first tens of seconds of sonolysis was needed to better characterize the formed plasma and to question the correlation of the SL spectra with the viscosity. A very dry [BEPip][NTf2] ionic liquid (IL) and a water-saturated liquid are studied in this paper. In both cases, IL degradation is observed as soon as SL emission appears. It is confirmed that the initial evolution of the SL intensity is closely linked to the liquid viscosity that impacts the number of bubbles; however, other parameters can also play a role, such as the presence of water. The water-saturated IL shows more intense SL and faster degradation. In addition to the expected bands, new emission bands are detected and attributed to the S2 B-X emission, which is favored in the water-saturated ionic liquid. Full article
(This article belongs to the Special Issue Sonoluminescence and Related Plasma Luminescence)
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14 pages, 2326 KiB  
Article
Microsecond Electrical Breakdown in Water: Advances Using Emission Analysis and Cavitation Bubble Theory
by Cathy Rond, Nicolas Fagnon, Benjamin Dufour, Son Truong Nguyen, Arlette Vega and Xavier Duten
Molecules 2022, 27(3), 662; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27030662 - 20 Jan 2022
Cited by 1 | Viewed by 1423
Abstract
Electrical discharges in water are a subject of major interest because of both the wide range of potential applications and the complexity of the processes. This paper aimed to provide significant insights to better understand processes involved during a microsecond electrical discharge in [...] Read more.
Electrical discharges in water are a subject of major interest because of both the wide range of potential applications and the complexity of the processes. This paper aimed to provide significant insights to better understand processes involved during a microsecond electrical discharge in water, especially during the propagation and the breakdown phases. Two different approaches were considered. The first analysis focused on the emission produced by the discharge during the propagation using fast imaging measurements and spatially resolved optical emission spectroscopy. The excited species H, O, and OH were monitored in the whole interelectrode gap. The second analysis concerned the thermodynamic conditions induced by the breakdown of the discharge. The time evolution of the bubble radius was simulated and estimation of the initial pressure of the cavitation bubble was performed using the Rayleigh–Plesset model. Values of about 1.7 × 107 Pa and 1.2 × 108 Pa were reported for the cathode and anode regimes, respectively. This multidisciplinary approach constitutes a new step to obtain an accurate physical and chemical description of pin-to-pin electrical discharges in water. Full article
(This article belongs to the Special Issue Sonoluminescence and Related Plasma Luminescence)
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16 pages, 3714 KiB  
Article
Study by Optical Spectroscopy of Bismuth Emission in a Nanosecond-Pulsed Discharge Created in Liquid Nitrogen
by Anna V. Nominé, Cédric Noel, Thomas Gries, Alexandre Nominé, Valentin A. Milichko and Thierry Belmonte
Molecules 2021, 26(23), 7403; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26237403 - 06 Dec 2021
Cited by 2 | Viewed by 1666
Abstract
Time-resolved optical emission spectroscopy of nanosecond-pulsed discharges ignited in liquid nitrogen between two bismuth electrodes is used to determine the main discharge parameters (electron temperature, electron density and optical thickness). Nineteen lines belonging to the Bi I system and seven to the Bi [...] Read more.
Time-resolved optical emission spectroscopy of nanosecond-pulsed discharges ignited in liquid nitrogen between two bismuth electrodes is used to determine the main discharge parameters (electron temperature, electron density and optical thickness). Nineteen lines belonging to the Bi I system and seven to the Bi II system could be recorded by directly plunging the optical fibre into the liquid in close vicinity to the discharge. The lack of data for the Stark parameters to evaluate the broadening of the Bi I lines was solved by taking advantage of the time-resolved information supported by each line to determine them. The electron density was found to decrease exponentially from 6.5 ± 1.5 × 1016 cm−3 200 ns after ignition to 1.0 ± 0.5 × 1016 cm−3 after 1050 ns. The electron temperature was found to be 0.35 eV, close to the value given by Saha’s equation. Full article
(This article belongs to the Special Issue Sonoluminescence and Related Plasma Luminescence)
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Review

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34 pages, 11592 KiB  
Review
Multibubble Sonoluminescence from a Theoretical Perspective
by Kyuichi Yasui
Molecules 2021, 26(15), 4624; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26154624 - 30 Jul 2021
Cited by 23 | Viewed by 2835
Abstract
In the present review, complexity in multibubble sonoluminescence (MBSL) is discussed. At relatively low ultrasonic frequency, a cavitation bubble is filled mostly with water vapor at relatively high acoustic amplitude which results in OH-line emission by chemiluminescence as well as emissions from weakly [...] Read more.
In the present review, complexity in multibubble sonoluminescence (MBSL) is discussed. At relatively low ultrasonic frequency, a cavitation bubble is filled mostly with water vapor at relatively high acoustic amplitude which results in OH-line emission by chemiluminescence as well as emissions from weakly ionized plasma formed inside a bubble at the end of the violent bubble collapse. At relatively high ultrasonic frequency or at relatively low acoustic amplitude at relatively low ultrasonic frequency, a cavitation bubble is mostly filled with noncondensable gases such as air or argon at the end of the bubble collapse, which results in relatively high bubble temperature and light emissions from plasma formed inside a bubble. Ionization potential lowering for atoms and molecules occurs due to the extremely high density inside a bubble at the end of the violent bubble collapse, which is one of the main reasons for the plasma formation inside a bubble in addition to the high bubble temperature due to quasi-adiabatic compression of a bubble, where “quasi” means that appreciable thermal conduction takes place between the heated interior of a bubble and the surrounding liquid. Due to bubble–bubble interaction, liquid droplets enter bubbles at the bubble collapse, which results in sodium-line emission. Full article
(This article belongs to the Special Issue Sonoluminescence and Related Plasma Luminescence)
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