Application of ultrasound in electrochemistry. An overview of mechanisms and design of experimental arrangement

Klíma, Jiří

doi:10.1016/j.ultras.2010.08.004

Cited by 87 publications

(51 citation statements)

References 29 publications

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“…However the external film mass transfer seems to be pronounced for multivalent cations rather than monovalent cation. The unexpected result of the ultrasonic method can rise from insufficient (local) mixing depending on the depth of the tip, shape and type of the beaker used in ion exchange experiment as stated by Klima [6].…”

Section: Diffusion Model: Intraparticle And/or Externalmentioning

confidence: 99%

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Effect of ultrasound on the kinetics of cation exchange in NaX zeolite

Erten-Kaya

Çakıcıoğlu-Özkan

2012

Ultrasonics Sonochemistry

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a b s t r a c tIn this study, we focused on the effect of ultrasound on ion exchange kinetics to obtain the Li-, Ca-and Cerich NaX zeolite. The results were compared to those obtained from the traditional batch exchange method under similar conditions. Contact time and initial cation concentration (fold equivalent excess) were studied. Ultrasound enhanced the replacement of Na + ion with Li + , Ca 2+ and Ce 3+ ions in the extra-framework of zeolite up to 76%, 72% and 66%, respectively. The intraparticle diffusion is the rate limiting step in the ion exchange for both exchange methods. As compared to the traditional exchange method, the ultrasonic method applied in this study was found to be very effective on the exchange amount at equilibrium.

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Section: Diffusion Model: Intraparticle And/or Externalmentioning

confidence: 99%

“…Another possible physical process mechanism of ultrasound is the acoustic streaming or steady flow, the movement of the liquid promoted by acoustic wave without cavitation. These process mechanisms are very effective for reducing the boundary layer thickness below 1 lm and can result in mass transfer enhancement [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasound on the kinetics of cation exchange in NaX zeolite

Erten-Kaya

Çakıcıoğlu-Özkan

2012

Ultrasonics Sonochemistry

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“…However, the case of streaming associated with acoustic beams has by far been the more studied case since celebrated pioneering works [8]. Ultrasonic acoustic streaming is in particular considered for its interest in a very broad variety of applications and processes, including acoustic velocimetry [9,10], sonochemistry applications [11][12][13][14], medical applications [15][16][17][18], acoustically assisted mixing, phase change, and blend separation [19][20][21][22][23], and metallic and semiconducting material processing [14,[24][25][26][27][28]. In these applications, acoustic streaming is usually considered with an objective to better control the flow dynamics and/or improve its mixing properties.…”

Section: Introductionmentioning

confidence: 99%

From flying wheel to square flow: Dynamics of a flow driven by acoustic forcing

et al. 2017

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Acoustic streaming designates the ability to drive quasisteady flows by acoustic propagation in dissipative fluids and results from an acoustohydrodynamics coupling. It is a noninvasive way of putting a fluid into motion using the volumetric acoustic force and can be used for different applications such as mixing purposes. We present an experimental investigation of a kind of square flow driven by acoustic streaming, with the use of beam reflections, in a water tank. Time-resolved experiments using particle image velocimetry have been performed to investigate the velocity field in the reference plane of the experiments for six powers: 0.5, 1, 2, 4, 6, and 8 W. The evolution of the flow regime from almost steady to strongly unsteady states is characterized using different tools: the plot of time-averaged and instantaneous velocity fields, the calculation of presence density maps for vortex positions and for the maximal velocity and vorticity crest lines, and the use of spatiotemporal maps of the waving observed on the jets created by acoustic streaming. A transition is observed between two regimes at moderate and high acoustic forcing.

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“…36 Currently, the influence of ultrasound waves and the mechanism of formation of the V 2 O 5 are still under investigation. The reactions were induced by low frequency/high intensity sound waves, resulting in a more violent cavitation bubble, generating a higher localized temperature and pressure, what could, possibly, improve the formation of nanostructures of V 2 O 5 .…”

Section: Resultsmentioning

confidence: 99%

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

Oliveira¹,

Oliveira²,

Alves³

et al. 2015

Revista Virtual De Química

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Resumo: Neste trabalho um novo procedimento de síntese do V 2 O 5 usando a combinação de dois métodos tradicionais, melt quenching e sonoquímica, chamado de melt sonoquenching foi proposto. O nanomaterial produzido foi caracterizado por vários métodos visando verificar características físicas e químicas, e sua possível aplicação como material eletrocrômico. Imagens de microscopia eletrônica de varredura mostraram nanofibras de óxido de vanádio com comprimentos variando de 140 a 160 nm, e diâmetros variando de 10 a 15 nm. Estudos de difração de raios X revelaram uma estrutura amorfas com espaçamento interlamelar de 13,3 Å. A composição foi estimada por TGA, sugerindo que a composição do óxido de vanádio xerogel foi de V 2 O 5 .1.8H 2 O. Em adição a isto, caracterizações espectroeletroquímicas mostraram uma variação de transmitância de 45 % em 410 nm, com uma persistência de coloração de 91,3 %; tempos de resposta para oxidação e redução foram de respectivamente 1 s e 3,5 s. e a eficiência eletrocrômica foi de 55 cm 2 C -1 ao longo de 100 ciclos de mudanças de coloração entre azul-verde-laranja. Palavras-chave:Eletrocromismo; eletrocrômico; V 2 O 5 ; fusão sonoresfriamento, melt sonoquenching. AbstractThis paper reports a new procedure for V 2 O 5 synthesis using the combination of two traditional methods, melt quenching and sonochemistry, called melt sonoquenching. The resulting nanomaterial was characterized by several methods in order to verify physical and chemical characteristics, and its possible use as electrochromic electrode material. Scanning electron micrographs revealed V 2 O 5 nanofibers with lengths varying from 140 to 160 nm, and diameters varying from 10 to 15 nm, X-ray diffraction experiments pointed to an amorphous structure with an interlamellar spacing of 13.3 Å. Chemical composition was estimated by TGA, suggesting that the composition for such xerogel oxide was V 2 O 5 .1.8H 2 O. Besides these, spectroelectrochemical characterization showed a transmittance variation of 45 % at 410 nm, with coloration persistence of 91.3 %, response times for the oxidation and reduction were, respectively, 1 s and 3.5 s, being such electrochomic efficiency of 55 cm 2 C -1 in throughout 100 cycles of color changes from blue-green-orange.

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Application of ultrasound in electrochemistry. An overview of mechanisms and design of experimental arrangement

Cited by 87 publications

References 29 publications

Effect of ultrasound on the kinetics of cation exchange in NaX zeolite

Effect of ultrasound on the kinetics of cation exchange in NaX zeolite

From flying wheel to square flow: Dynamics of a flow driven by acoustic forcing

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

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