Effects of ultrasound frequency and acoustic amplitude on the size of sonochemically active bubbles – Theoretical study

Merouani, Slimane; Hamdaoui, Oualid; Rezgui, Yacine; Guemini, Miloud

doi:10.1016/j.ultsonch.2012.10.015

Cited by 149 publications

(83 citation statements)

References 24 publications

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“…It is therefore wise to venture into knowing the impact each field -frequency and power of ultrasound, time of experiment, nature and concentration of solution etc. have on the overall process [49]- [51]. Only upon gaining the necessary intuition can a clear and analytical mind be set to logically understand the materials formed.…”

Section: ‫ݔ(ܲ‬ ‫)ݐ‬ = ‫ܣ‬ ‫ݐ߱(ݏܿ‬ − ‫ݔߚ‬ + ߮) -----(3)mentioning

confidence: 99%

Sonochemistry: Science and Engineering

Pokhrel

Vabbina

Pala

2016

Ultrasonics Sonochemistry

314

127

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Sonochemistry offers a simple route to nanomaterial synthesis with the application of ultrasound. The tiny acoustic bubbles, produced by the propagating sound wave, enclose an incredible facility where matter interact among at energy as high as 13 eV to spark extraordinary chemical reactions. Within each period - formation, growth and collapse of bubbles, lies a coherent phase of material formation. This effective yet highly localized method has facilitated synthesis of various chemical and biological compounds featuring unique morphology and intrinsic property. The benign processing lends to synthesis without any discrimination towards a certain group of material, or the substrates where they are grown. As a result, new and improved applications have evolved to reach out various field of science and technology and helped engineer new and better devices. Along with the facile processing and notes on the essence of sonochemistry, in this comprehensive review, we discuss the individual and mutual effect of important input parameters on the nanomaterial synthesis process as a start to help understand the underlying mechanism. Secondly, an objective discussion of the diversely synthesized nanomaterial follows to divulge the easiness imparted by sonochemistry, which finally blends into the discussion of their applications and outreach.

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Section: ‫ݔ(ܲ‬ ‫)ݐ‬ = ‫ܣ‬ ‫ݐ߱(ݏܿ‬ − ‫ݔߚ‬ + ߮) -----(3)mentioning

confidence: 99%

Sonochemistry: Science and Engineering

Pokhrel

Vabbina

Pala

2016

Ultrasonics Sonochemistry

314

127

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“…Moreover, it has recently been reported that the acoustic amplitude affects the range of ambient bubble radius for the production of HO • radical and the higher the acoustic amplitude was, the higher was the range of active bubbles for the production of the oxidants. 39 This implies that higher acoustic amplitude yields a higher number of bubbles and this leads to a higher concentration of • OH radicals in the dye solution. Consequently, the results of an increase in power intensity are greater sonochemical effects on microscopic and macroscopic scales (bubble and solution, respectively), resulting in higher BR29 degradation rates.…”

Section: Effect Of Power Intensitymentioning

confidence: 99%

Sonochemical degradation of Basic Red 29 in aqueous media

Boutamine¹,

Merouani²,

Hamdaoui³

2017

Turk J Chem

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Abstract:In this work, the degradation of Basic Red 29 (BR29), an azo dye, was investigated using a high-frequency ultrasonic reactor (300 kHz). The influence of several parameters such as initial substrate concentration (5-200 mg L −1 ) , pH (3-10.1), ultrasonic power (20-80 W), and nature of the dissolved gas (Ar, air, and N 2) on the degradation of BR29was assessed. Additionally, the impact of natural matrices (seawater and natural and river waters) on the degradation rate of BR29 was clarified. Degradation experiments with radical scavengers, tert-butyl alcohol and glucose, showed that BR29 degraded mainly through HO• radical attack at the gas/liquid interface of the cavitation bubbles. The degradation of the dye was strongly sensitive to the operational conditions. The natural matrices enhanced the degradation of the dye. Ultrasonic mineralization and oxidation of the dye solution was significantly enhanced by addition of a low quantity of Fe 2+ (15 mg L −1 ) .

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“…As expected, the results showed that the increasing ultrasonic power significantly reduced the extraction time and obtained the highest extraction yield. It might be mainly attributed to the reason that an increase in ultrasonic power can provide more intense acoustic cavitation, which can markedly influence the acoustic amplitude and the dynamics of cavitation bubbles [30,31], and further can affect the extraction efficiency. As a result, the increase of ultrasonic power is beneficial to shorten the extraction time and to enhance the extraction yield.…”

Section: Effect Of Ultrasonic Powermentioning

confidence: 99%

Extraction of Glycyrrhizic Acid from Glycyrrhiza uralensis Using Ultrasound and Its Process Extraction Model

Liao

Zheng

2016

Applied Sciences

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This work focused on the intensification of extraction process of glycyrrhizic acid (GA) from Glycyrrhiza uralensis using ultrasound-assisted extraction (UAE) method. Various process parameters such as ultrasonic power, ultrasonic frequency, extraction temperature, and extraction time which affect the extraction yield were optimized. The results showed that all process parameters had exhibited significant influences on the GA extraction. The highest GA yield of 217.7 mg/g was obtained at optimized parameters of 125 W, 55 kHz, 25 • C, and 10 min. Furthermore, the extraction kinetics model of this process was also investigated based on Fick's first law available in the literature. Kinetic parameters such as equilibrium concentration (C e ) and integrated influence coefficient (λ) for different ultrasonic powers, ultrasonic frequencies, and extraction temperatures were predicted. Model validations were done successfully with the average of relative deviation between 0.96% and 4.36% by plotting experimental and predicted values of concentration of GA in extract. This indicated that the developed extraction model could reflect the effectiveness of the extraction of GA from Glycyrrhiza uralensis and therefore serve as the guide for comprehending other UAE process.

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Effects of ultrasound frequency and acoustic amplitude on the size of sonochemically active bubbles – Theoretical study

Cited by 149 publications

References 24 publications

Sonochemistry: Science and Engineering

Sonochemistry: Science and Engineering

Sonochemical degradation of Basic Red 29 in aqueous media

Extraction of Glycyrrhizic Acid from Glycyrrhiza uralensis Using Ultrasound and Its Process Extraction Model

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