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Sonocatalysis
Sonocatalysis is a field of sonochemistry which is based on the use of ultrasound to change the reactivity of a catalyst in Homogeneous catalysis, homogenous or heterogenous catalysis. It is generally used to support catalysis. This method of catalysis has been known since the creation of sonochemistry in 1927 by (1887–1975) and Robert W. Wood, Robert Williams Wood (1868–1955). Sonocatalysis depends on ultrasounds, which were discovered in 1794 by the Italian biologist Lazzaro Spallanzani, Lazarro Spallanzani (1729–1799). Principle General concept Sonocatalysis is not a self-sufficient catalysis technique but instead supports a catalyst in the reaction. Sonocatalysis and sonochemistry both come from a phenomenon called “acoustic cavitation”, which happens when a liquid is irradiated by ultrasounds. Ultrasounds will create huge local variations of pressure and temperature, affecting the liquid's relative density and creating cavitation bubbles when liquid pressure ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sonochemistry
In chemistry, the study of sonochemistry is concerned with understanding the effect of ultrasound in forming acoustic cavitation in liquids, resulting in the initiation or enhancement of the chemical activity in the solution. Therefore, the chemical effects of ultrasound do not come from a direct interaction of the ultrasonic sound wave with the molecules in the solution. History The influence of sonic waves travelling through liquids was first reported by Robert Williams Wood (1868–1955) and Alfred Lee Loomis (1887–1975) in 1927. The experiment was about the frequency of the energy that it took for sonic waves to "penetrate" the barrier of water. He came to the conclusion that sound does travel faster in water, but because of the water's density compared to Earth's atmosphere it was incredibly hard to get the sonic waves to couple their energy into the water. Due to the sudden density change, much of the energy is lost, similar to shining a flashlight towards a piece of gla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |