Precursors sonochemistry

In a MWH process one precursor can be heated at much higher heating rates and reach a higher temperature than its surroundings. In this respect it is similar to sonochemistry, where hot spots are formed in the liquid. In the polyol reactions where the first step was the formation of metallic fine particles, we could see the solution of ethylene glycol hot points reaching 600-700 °C. The difference between sonochemistry and MWH is that in the latter method there is no direct contact between the energy source and the solution, while in the sonochemistry the horn is dipped into the solution. 

One of the most important aspects inherent in sonochemistry concerns synthesis and treatment of organic and inorganic materials. Effects of ultrasound on chemical transformations were studied in three directions sonochemistry in homogeneous liquid system, sonochemistry in heterogeneous liquid-liquid or liquid-solid several times as well as sonocatalysis. Thus, the cavitation concentrates sound energy to affect the synthesis from soluble precursors. Chemical reactions are usually not observed in sonicated solid-solid and solid or gas systems. 

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