Sonochemistry and sonoluminescence: effects of external pressure

Henglein, A.; Gutiérrez, M.

doi:10.1021/j100103a027

Cited by 128 publications

(128 citation statements)

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“…As shown in Fig. 6, for 100 mL of KI solution, amount of iodine liberated increased with power supplied for both systems similar to earlier studies at lower frequencies [7,12,13].…”

Section: Effect Of Acoustic Power Suppliedsupporting

confidence: 86%

“…The effect of power supplied on the oxidation of KI while sonicating between 20 kHz and 900 kHz has been studied previously [7,12,13]. Entezari and Kruus [1] observed that at 900 kHz, as the power supplied increases, the production of iodine increased linearly between 8 and 76 W with a clear cavitation threshold at 0.14 W cm À2 .…”

Section: Effect Of Acoustic Power Suppliedmentioning

confidence: 97%

“…In contrast, at 20 kHz, they found that the increase in iodine production was non-linear as the power supplied was increased from 8 to 130 W. To explain the non-linear behavior, they proposed that the iodine production rate slows at higher power due to the large number of visible bubbles that migrate out of solution. Both Weissler et al [7] and Henglein and Gutierrez [13] studied the effect of power density on the oxidation of KI at 1 MHz and observed that the amount of iodine liberated increased with acoustic power supplied and then decreased sharply for small volumes (up to 50 mL) of KI solution under sonication. At 1 MHz, Weissler et al [7] also observed that for large volumes (100 mL), iodine production increased linearly as power increased from 0 to 600 W. Henglein and Gutierrez [13] reported that at large volumes, the iodine production tends to show a non-linear increase with an increase in power, however the drop off was not observed in the experimental range (20-150 W).…”

Section: Effect Of Acoustic Power Suppliedmentioning

confidence: 99%

“…Both Weissler et al [7] and Henglein and Gutierrez [13] studied the effect of power density on the oxidation of KI at 1 MHz and observed that the amount of iodine liberated increased with acoustic power supplied and then decreased sharply for small volumes (up to 50 mL) of KI solution under sonication. At 1 MHz, Weissler et al [7] also observed that for large volumes (100 mL), iodine production increased linearly as power increased from 0 to 600 W. Henglein and Gutierrez [13] reported that at large volumes, the iodine production tends to show a non-linear increase with an increase in power, however the drop off was not observed in the experimental range (20-150 W). In this study, initial experiments determined the threshold power for iodine production, which coincides with the appearance of cavitation bubbles, was 1.17 W cm À2 and 3.14 W cm À2 for 100 mL of KI solution in the 1.7 MHz and 2.4 MHz systems respectively.…”

Section: Effect Of Acoustic Power Suppliedmentioning

confidence: 99%

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Experimental quantification of cavitation yield revisited: focus on high frequency ultrasound reactors

Kirpalani

McQuinn

2006

Ultrasonics Sonochemistry

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Acoustic cavitation plays an important role in enhancing the reaction rate of chemical processes in sonochemical systems. However, quantification of cavitation intensity in sonochemical systems is generally limited to low frequency systems. In this study, an empirical determination of cavitation yield in high frequency ultrasound systems was performed by measuring the amount of iodine liberated from the oxidation of potassium iodide (KI) solution at 1.7 and 2.4 MHz. Experiments for determining cavitation were carried out at various solute (KI) concentrations under constant temperature, obtained by direct cooling of the solution and variable temperature conditions, in the absence of external cooling. Cavitation yield measurements, reported in this work, extend previously reported results and lend credence to the two step reaction pathway in high frequency systems. Additionally, the concentration of KI and temperature affect the cavitation yield of a system such that the iodine production is proportional to both conditions. It is proposed that direct cooling of sonicated KI solution may be advantageous for optimization of cavitation intensity in high frequency sonochemical reactors. Crown

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“…As shown in Fig. 6, for 100 mL of KI solution, amount of iodine liberated increased with power supplied for both systems similar to earlier studies at lower frequencies [7,12,13].…”

Section: Effect Of Acoustic Power Suppliedsupporting

confidence: 86%

Section: Effect Of Acoustic Power Suppliedmentioning

confidence: 97%

Section: Effect Of Acoustic Power Suppliedmentioning

confidence: 99%

Section: Effect Of Acoustic Power Suppliedmentioning

confidence: 99%

See 2 more Smart Citations

Experimental quantification of cavitation yield revisited: focus on high frequency ultrasound reactors

Kirpalani

McQuinn

2006

Ultrasonics Sonochemistry

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“…When ultrasonic waves disperse into the solution, they create compression waves, consequently rupturing the solution and generating an enormous number of voids or cavities. These huge quantities of bubbles collapse and produce very high temperature and pressure that is 5000 K and 20,000 lbs/inch 2 , respectively [38,39]. These very high temperatures increase the Brownian motion and mobility of the surface atoms; as a result, collisions between nanoparticles will increase, followed by adhesion and coalescence between them [40].…”

Section: Ag and Tio 2 Combinationmentioning

confidence: 99%

The characteristics of novel bimodal Ag–TiO2 nanoparticles generated by hybrid laser-ultrasonic technique

Hamad

Liu

et al. 2016

Appl. Phys. A

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Silver-titania (Ag-TiO 2 ) nanoparticles with smaller Ag nanoparticles attached to larger TiO 2 nanoparticles were generated by hybrid ultrasonic vibration and picosecond laser ablation of Ag and Ti bulk targets in deionised water, for the first time. The laser has a wavelength of 1064 nm and a pulse duration of 10 ps. It was observed that without the ultrasonic vibration, Ag and TiO 2 nanoparticles did not combine, thus the role of ultrasonic vibration is essential. In addition, colloidal TiO 2 and Ag nanoparticles were generated separately for comparison under the same laser beam characteristics and process conditions. The absorption spectra of colloidal Ag-TiO 2 cluster nanoparticles were examined by UV-Vis spectroscopy, and size distribution was characterised using transmission electron microscopy. The morphology and composition of Ag-TiO 2 nanoparticles were examined using scanning transmission electron microscopy in highangle annular dark field, and energy-dispersive X-ray spectroscopy. The crystalline structures were investigated by X-ray diffraction. The size of larger TiO 2 particles was in the range 30-150 nm, and the smaller-sized Ag nanoparticles attached to the TiO 2 was mainly in the range of 10-15 nm. The yield is more than 50 % with the remaining nanoparticles in the form of uncombined Ag and TiO 2 . The nanoparticles generated had strong antibacterial effects as tested against E. coli. A discussion is given on the role of ultrasonic vibration in the formation of Ag-TiO 2 hybrid nanoparticles by picosecond laser ablation.

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