Graphene is also known as king of new materials or black gold, is a thinnest and hardest new nanomaterial with most conductive and thermal conductivity found so far. With the development of modern science and industrial technology, the requirement to graphene production is also higher and higher. Graphene can be prepared by ultrasonic dispersion at lower cost and in large quantities, and further to realize broad commercialized applications such as photo-sensitive components, new energy, sensors, paint and coatings, electrodes, batteries, transistors, flexible displays, solar energy, ultra-light materials, composite materials, sea water desalination, etc.

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The pressure of medium is changed alternately in the propagation process of rod transducer. In positive pressure region, the liquid medium bears extrusion force and forms increased density, conversely, in the negative pressure region, the lquid medium bears tear force and forms reduced density. The ultrasonic energy is distributed at 360° along the whole length of rod body. The output energy will not be affected by the change of the load such as the liquid level, temperature difference, etc. Compared to the traditional ultrasonic box, it has mor extensive range of applications and longer service life. Ultrasonic processing is a mature and widely-applied technology in cleaning, extraction, chemical reaction, anti scale, water treatment and so on.

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In recent 20 years, Sonochemistry is the application of ultrasound to chemical reactions and processes, and extensively applied in various industrial fields such as chemical, petroleum, metallurgy, coal, electronic, medicine, building materials, light industry, etc. Comparing the traditional method, it features that simple operation, mild reaction condition, shorter reaction time and higher yield. Ultrasonic sonochemistry can enable many capabilities that were previously very difficult or not practical to implement, open up a new way for chemical reaction. Small ultrasonic cleaners are often used as ultrasonic reactor in laboratory.

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Heat exchange equipment is used as a general equipment for many industrial sectors including chemical, petroleum, power, food, etc. The scaling problem has been a bottleneck of the long-term industrial production, and cause the huge economic loss. At the end of the 20th century, Russia, South Korea and other contries first adopted advanced ultrasonic descaling technology.

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Ultrasonic cavitation effect is the dynamical processes in which cavitation bubbles in liquid are forced to grow and collapse due to a certain acoustic pressure, small vacuum bubbles in liquid collapse and cause many phenomenons such as high pressure, high temperature, electrical discharge, luminescence, shock wave, etc. The factors affecting the formation of vacuum void include ultrasonic energy, implosion shock, impact and friction of high-speed fluid, strong reactions, etc.

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Ultrasonic cavitation effect provides probable conditions for degradation of harmful organic substance, and thus realizes wastewater treatment by ultrasonic technology. In sewage treatment process, acoustic cavitation can greatly increase the degradation rate. By collapse of bubbles, a large amount of energy will be released to cause chemical bonds cleavage, and form hydroxyl (OH) and hydrogen (H) radicals, and oxidize dissolved organic compounds, formed as a consequence of OH, HO2, inorganic ions, and other easily degradable organism. So ultrasonic method can make non-biodegradable organics easily to degradation.

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