نتایج جستجو برای: sonochemical

تعداد نتایج: 1241  

Journal: :Ultrasonics sonochemistry 2015
Barath Palanisamy Brian Paul Chih-hung Chang

A continuous flow sonochemical reactor was developed capable of producing metastable cadmium sulfide (CdS) nanoplatelets with thicknesses at or below 10nm. The continuous flow sonochemical reactor included the passive in-line micromixing of reagents prior to sonochemical reaction. Synthesis results were compared with those from reactors involving batch conventional heating and batch ultrasound-...

Journal: :Molecules 2013
Yujing Sun Xingqian Ye

Little is known about the efficacy of pulsed ultrasound compared with continuous ultrasound. Previous studies on the efficacy of pulsed ultrasound were not systematic and gave different results. In this study, the effects of pulse length, pulse interval, pulse length × pulse intervals, and treatment time on sonochemical activity were investigated using a simple oxidation of iodide method and a ...

Journal: :Environmental science & technology 2010
Jie Cheng Chad D Vecitis Hyunwoong Park Brian T Mader Michael R Hoffmann

Ultrasonic irradiation has been shown to effectively degrade perfluorinated chemicals (PFCs) such as perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) in aqueous solution. Reduced PFC sonochemical degradation rates in organic-rich groundwater taken from beneath a landfill, however, testify to the negative kinetic effects of the organic groundwater constituents. In this study, the P...

2009
Mohammad Hadi Dehghani Ali Reza Mesdaghinia Simin Nasseri Amir Hossein Mahvi Kamal Azam

The effect of sonochemical reactors (SCR) technology upon the degradation of reactive yellow dye has been studied and reported here. Sonochemical reactors (ultrasound irradiation) produce strong cavitation in aqueous solution causing shock wave and reactive free radicals by the violent collapse of the cavitation bubble. These effects should contribute to destruction as well as the decomposition...

2010
D. Fernandez Rivas A. G. Zijlstra A. Prosperetti D. Lohse

We present an efficient sonochemical microreactor system based on micromachined surfaces which generate microbubbles in a liquid when exposed to an ultrasonic field. Cavitation of these bubbles leads to radical formation, introducing chemical reactions in the solution. The system exhibits a high sonochemical yield at conditions which would otherwise not produce any significant chemical effect, ...

2010
José González-García Verónica Sáez Ignacio Tudela María Isabel Díez-Garcia María Deseada Esclapez Olivier Louisnard

As one of several types of pollutants in water, chlorinated compounds have been routinely subjected to sonochemical analysis to check the environmental applications of this technology. In this review, an extensive study of the influence of the initial concentration, ultrasonic intensity and frequency on the kinetics, degradation efficiency and mechanism has been analyzed. The sonochemical degra...

1997
Kenneth S. Suslick Taeghwan Hyeon Mingming Fang

The sonochemical decomposition of volatile organometallic compounds produces high surface area solids that consist of agglomerates of nanometer clusters. For iron pentacarbonyl and tricarbonylnitrosylcobalt, nanostructured metals and alloys are formed; for molybdenum hexacarbonyl, the metal carbide is produced. These sonochemically produced nanostructured solids are active heterogeneous catalys...

2017
Elodie Dalodière Matthieu Virot Vincent Morosini Tony Chave Thomas Dumas Christoph Hennig Thierry Wiss Oliver Dieste Blanco David K. Shuh Tolek Tyliszcak Laurent Venault Philippe Moisy Sergey I. Nikitenko

Fundamental knowledge on intrinsic plutonium colloids is important for the prediction of plutonium behaviour in the geosphere and in engineered systems. The first synthetic route to obtain salt-free intrinsic plutonium colloids by ultrasonic treatment of PuO2 suspensions in pure water is reported. Kinetics showed that both chemical and mechanical effects of ultrasound contribute to the mechanis...

Journal: :Environmental science & technology 2008
Jie Cheng Chad D Vecitis Hyunwoong Park Brian T Mader Michael R Hoffmann

Perfluorinated chemicals such as perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are environmentally persistent and recalcitrant to most conventional chemical and microbial treatment technologies. In this paper, we show that sonolysis is able to decompose PFOS and PFOA present in groundwater beneath a landfill. However, the pseudo first-order rate constant for the sonochemica...

Journal: :Chemical communications 2015
Hongqiang Wang Zejing Xu Mark J Fink Dmitry Shchukin Brian S Mitchell

A new sonochemical process for the top-down production of silicon nanoparticles (<1 nm) with surface functional groups is described. The procedure involves a combination of acoustic cavitation erosion of a single-crystalline silicon surface coupled with simultaneous reaction with a reactive organic compound such as 1-hexyne. The sonochemical formation of the photoluminescent silicon nanoparticl...

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