On the origin of sonoluminescence and sonochemistry

Suslick, Kenneth S.; Doktycz, Stephen J.; Flint, Edward B.

doi:10.1016/0041-624x(90)90033-k

Cited by 379 publications

(218 citation statements)

References 42 publications

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“…Ultrasonic irradiation provides a way of onsite ·OH generation. By such, the dissolved vapors and gases in the liquid are entrapped by cavitation bubbles, which release very high temperatures during their adiabatic collapse [14,15]. In sonolysis of water containing hydrophilic compounds such as textile dyes, hydroxyl radicals are generated only by water fragmentation in the collapsing bubbles, and oxidative dye destruction is possible if the radicals are effectively ejected into the solution bulk.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic cavitation induced degradation of Congo red in aqueous solutions

Meshram¹,

Tayade²,

Ingle

et al. 2010

Chem. Eng. Res. Bull.

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Ultrasonic cavitation induced degradation of Congo red in aqueous solution was investigated for a variety of operating conditions. It is found that the degradation of Congo red in aqueous solution follows pseudo-first-order reaction kinetics and the degradation rate is dependent on the initial concentration of Congo red, the temperature and pH of the aqueous medium. The effects of Fe 2+ and Fenton reagent addition on the sonochemical degradation of Congo red were also investigated. The results obtained here indicate that the degradation rate of Congo red in aqueous solution was substantially accelerated by Fe 2+ , NaCl or Fenton reagent addition.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic cavitation induced degradation of Congo red in aqueous solutions

Meshram¹,

Tayade²,

Ingle

et al. 2010

Chem. Eng. Res. Bull.

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“…Os efeitos em processos heterogêneos incluem erosão de superfícies sólidas 28 e uma mudança drástica no transporte de massa. A erosão é induzida por cavitação assimétrica 29 próxima à interface eletrodo-solução e esse processo é responsável pela danificação e limpeza da superfície que, em alguns casos, mostra a presença de partículas ou filmes aderentes.…”

Section: Introductionunclassified

Aplicação do ultra-som em sistemas eletroquímicos: considerações teóricas e experimentais

Garbellini¹,

Salazar‐Banda²,

Avaca³

2008

Quím. Nova

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Recebido em 24/8/06; aceito em 23/3/07; Publicado na web em 19/12/07 ULTRASOUND APPLICATIONS IN ELECTROCHEMICAL SYSTEMS: THEORETICAL AND EXPERIMENTAL ASPECTS. The aim of this review is to present and discuss the applications of ultrasound in electrochemical systems such as in sonoelectroanalysis and sonoelectrolysis for the electrochemical combustion of organic compounds. Initially, theoretical and experimental aspects are discussed, particularly those related to the enhancement of mass transport and the surface cleaning effects. Some results are included to illustrate alternative geometries for the experimental measurements and the working electrodes used in these systems. In the sequence, the available publications are presented and discussed to demonstrate that ultrasound combined with electrochemical techniques is a powerful set-up for the detection of analytes such as metals and/or organic compounds in hostile media and for the effective destruction of toxic organic substances. At the end, a table summarizes the results already published in the literature.Keywords: ultrasound; electroanalysis; electrolysis. INTRODUÇÃOOs benefícios do ultra-som em processos eletroquímicos têm sido bastante relatados e explorados na literatura [1][2][3][4][5] . Os trabalhos de revisão encontrados relatam aspectos teóricos do efeito do ultrasom em experimentos eletroquímicos e mostram a aplicação destes sistemas na análise de metais em água (eletrólito suporte) e em amostras complexas. Entretanto, nada foi relatado a respeito da detecção sonoeletroanalítica de compostos orgânicos, que apresentam uma forte interação com as diferentes superfícies eletródicas. Adicionalmente, outra questão que não tem sido considerada nestas revisões é a combustão eletroquímica de compostos orgânicos e subprodutos (produtos de degradação) utilizando a sonoeletroquímica.Deste modo, justifica-se o interesse em entender e mostrar à comunidade científica, os efeitos do ultra-som nos processos eletroquímicos para o futuro desenvolvimento de metodologias de detecção e destruição de compostos tóxicos para a saúde humana e para o ambiente, considerando-se os trabalhos publicados nesta área de pesquisa até o momento.A produção do ultra-som é um fenômeno físico baseado no processo de criar, aumentar e implodir cavidades de vapor e gases. Este processo é denominado cavitação, onde em um meio líquido, promove um efeito de ativação em reações químicas. Durante a etapa de compressão, a pressão é positiva, enquanto que a expansão resulta em vácuo chamado de pressão negativa, constituindose em um ciclo de compressão-expansão que gera as cavidades 6,7 . O ultra-som tem sido utilizado em sínteses orgânicas 8 , polimerização 9,10 , sonoluminescência 11 , sonólise 12,13 , preparação de catalisadores 6 , sonoeletrosíntese 14,15 , entre outras aplicações, visando o entendimento da natureza da cavitação e dos efeitos químicos do ultra-som.A aplicação do ultra-som a sistemas eletroquímicos caracteriza-se pela forte influência no transporte de massa até a interface eletr...

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“…Tiny particles of 5 microns may become fused to the surface of the oxide film due to the effect of the great impact velocity. Suslick 7) found that a neck could form as a result of the localized melting of metal powder (on the average, 5 microns in diameter), affected by interparticle collisions during the ultrasonic-vibration treatment. Figure 6(b) shows some of these tiny particles, mainly calcium carbonate, fused to the oxide film, and some micro-cracks with or without fused particles, on the surface of the oxide film.…”

Section: Formation Of Foggy Marks On the Treated Samplementioning

confidence: 99%

“…Suslick et al 7) has indicated that for solid particles, smaller than 200 microns, micro-jets do not form for 20 kHz ultrasonic frequencies. Apfel 5) made some assumptions, and then calculated the critical size for a mote to form cavitation, about 2.5 microns, which corresponds to a critical crevice.…”

Section: Introductionmentioning

confidence: 99%

Marking Oxide Films on the Section of Al-XSi Alloys by Ultrasonic-vibration Treatment

2003

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Oxide films entrapped in Al-XSi alloys with an X from 0% to 13% are different, and can be identified by the presented ultrasonic-vibration treatment. After polishing and ultrasonic-vibration treatment, the surfaces of samples or castings then show differently shaped foggy marks, including lumps, flakes, strips or spots. Oxide films fracture and particles become detached from the film during ultrasonic-vibration treatment. The polished surface thus becomes partly eroded after treatment, and these eroded areas are visibly as differently shaped foggy marks. This paper presents a sequential summary of the formation of these eroded areas, foggy marks, in samples of pure aluminum and Al-XSi alloys during ultrasonic-vibration treatment.

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On the origin of sonoluminescence and sonochemistry

Cited by 379 publications

References 42 publications

Ultrasonic cavitation induced degradation of Congo red in aqueous solutions

Ultrasonic cavitation induced degradation of Congo red in aqueous solutions

Aplicação do ultra-som em sistemas eletroquímicos: considerações teóricas e experimentais

Marking Oxide Films on the Section of Al-XSi Alloys by Ultrasonic-vibration Treatment

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