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Ultrasonic Graphene Production
Mar 02, 2018

1. Acoustic chemistry is a new interdisciplinary, mainly refers to the use of ultrasound to accelerate the chemical reaction or trigger a new reaction channel to increase the yield of chemical reactions or access to new chemical reaction products. The main driving force of sonochemical reaction comes from acoustic cavitation, which comes from extreme physical conditions such as high temperature (more than 5 000 K), high pressure (more than 2.03 × 108 Pa), shock wave or micro-jet accompanied by cavitation bubble implosion.

 

2. The application of ultrasound chemistry Acoustic chemistry has a wide range of applications and can be broadly classified into nine broad categories: biochemistry, analytical chemistry, catalysis, electrochemistry, photochemistry, environmental chemistry, mineral chemistry, extraction and separation , Synthesis and degradation.

 

3. Ultrasonic waves in the liquid medium, through the mechanical action, cavitation and thermal effects, resulting in a series of mechanical, thermal, optical, electrical and chemical effects. Especially high-power ultrasound, will produce a strong role in cavitation, which in the local formation of instantaneous high temperature, high pressure, vacuum and micro-jet. Ultrasound technology, as a physical tool and tool, creates a series of near-extreme conditions in media commonly used in chemical reactions that not only excite or promote many chemical reactions, speed up chemical reactions, but also change some The direction of the chemical reaction produces some unexpected effects and miracles. Generally believed that the occurrence of these phenomena mainly due to the mechanical and cavitation ultrasonic effect is that they change the reaction conditions and the environment results. Mechanical effects - the introduction of ultrasound into the chemical reaction system, ultrasonic material can make violent forced movement, resulting in a one-way force to accelerate the transfer of material, diffusion, instead of mechanical stirring, material can be stripped from the surface, so that the interface update. Cavitation - In some cases, the generation of ultrasound effects has to do with the mechanism of cavitation, which is the series of motive forces that occur with tiny bubbles (cavities) in the liquid under the influence of sound waves Learning process: oscillation, expansion, contraction and even collapse. Occurs in cavitation, the liquid state of the local great changes occur, will produce extreme high temperature and high pressure. It provides a new and very special physicochemical environment for the chemical reactions that are difficult or impossible under the general conditions.


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