Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"sonochemistry"”.
-
The Sonochemistry of Some Metal Carbonyl Complexes (Iron, Chromium)
Ultrasonic irradiation of solutions produces accoustic cavitation; the formation, growth and violent collapse of gas bubbles in solution. During collapse of the bubbles, local temperatures of approximately 3300 K and pressures of approximately 300 atm may be produced. These high temperatures and …
-
The sonochemical synthesis of inorganic and biological materials
… opened new avenues of research. The mechanism of sonochemistry involves acoustic cavitation: the formation, growth, and collapse of bubbles in a liquid. New biological and inorganic materials can be synthesized using this unusual high energy source.
-
The chemical effects of ultrasound
… our understanding of the nature and range of sonochemistry is quite limited. The effects of ultrasound on liquid-solid interfaces include high speed liquid microjet impact, shock wave damage, enhanced mass transport near surfaces, and high velocity interparticle collisions.
-
Novel Synthetic Routes to Formation of Magnetic Nanocomposites
… nanoparticles have been designed by sonochemistry. Treatment of preformed magnetite nanoparticles with ultrasound in aqueous media with dissolved tetrachloroauric acid resulted in the formation of gold-magnetite nanocomposite materials. These materials maintained the morphology of the …
-
Ultrasound induced cavitation and sonochemical effects
… that cannot be achieved by conventional means. Sonochemistry, the chemistry associated with this phenomenon, has found application in drug delivery, waste decomposition, water treatment, chemical reaction enhancement and numerous novel material processes. A theoretical framework that directly …
-
Sonoluminescence for the quantitative analysis of alkali and alkaline earth chlorides
… of their potential for quantitative analysis and sonochemistry.
-
Ultrasonically Enhanced Mass Transport and Degradation of Polycyclic Aromatic Hydrocarbons in Solid-Liquid Two Phase Partitioning Systems
… under sonicated conditions, agreeing with sonochemistry concepts. Improvements were demonstrated across a range of polymers, suggesting that sonication could enhance PAH release with any polymers deemed feasible for environmental applications. A PAH-degrading microbial consortium was …
-
Mechanisms of Microstructure Formation Under the Influence of Ultrasonic Vibrations
… in chemistry, creating a new branch of science - sonochemistry. However, ultrasonication has not found wide commercial application in the solidification processing. The reason for that is the complexity of underlying phenomena and the lack of predicting models which correlate processing parameters …
-
Ultrasonic synthesis of materials for energy conversion devices
… synthesis has attracted much attention. Sonochemistry is found to be a very effective way of producing nano-sized materials with unique properties, while ultrasonic spray pyrolysis shows promising results for the mass production of the nanostructured materials. Therefore in this …
-
Nuclear magnetic resonance spectroscopy and ultrasound
… to demonstrate the usefulness of ultrasound in sonochemistry. The latter objective being, detection of radical formation in monomer and polymer ultrasonic degradation. The principle features of the results obtained are: Ultrasonic perturbation of T1 is far smaller for pure liquids than is for …
-
Chemical and physical effects of ultrasound: sonoluminescence and materials
… for the driving of chemical reactions (sonochemistry) and the emission of light (sonoluminescence). The implosive collapse of bubbles in liquids results in an enormous concentration of sound energy into compressional heating of the bubble contents. Therefore, extreme chemical and …
-
Silicone microspheres and disposable separation technology for gaseous analytes
Part I of this dissertation describes the synthesis and characterization of solid, copolymeric, magnetic, fluorescent, core-shell, and hollow or foamed micron-sized silicone spheres prepared via ultrasonic spray pyrolysis (USP). Silicones are found in an amazing number of commercial products …
-
Hydroxyl Radical Production via Acoustic Cavitation in Ultrasonic Humidifier Systems
Ultrasonic humidifiers use sound vibrations at frequencies higher than can be heard by humans (> 20,000 Hz) to generate aerosolized water also have potential for inducing sonochemical reactions for chemicals present in water. This research focuses on examining oxidants formed within ultrasonic …
-
Control of micro- and nanostructure: I. polymer gas chromatography microcolumns and II. applications of ultrasound
This thesis is comprised of two parts united by the general theme of making materials with micro- and nanostructural features. Being able to control the size and shape of materials is useful and important for a variety of different applications, including analytical materials, composites, and …