Sonochemistry

Sonochemistry

Description

Sonochemistry is a branch dealing with effects of chemical as well as sound wave as the name suggest. The sound waves are ultrasonic, i.e., high frequency waves (20 kHz can extent to 10 MHz and above) beyond the range of a human ear (20–20 kHz). Sonochemistry technology is incorporated into both mechanistic and synthetic studies. An important event called acoustic cavitation take place where microbubbles grow and under the influence of ultrasonic waves they collapse. Sonoluminescence is one of the outcomes of cavitation which leads to homogeneous sonochemistry. Sonochemistry has also entered one of the major developing field biotechnology from basic activation of enzyme to preparation of catalyst. It is also used for the fabrication of nanomaterial which comes under the liquid phase method. One disadvantage of nanomaterial preparation is the amount of time it consumes to show results. This can be eliminated when biotechnological research is conducted in conjunction with sonochemical application. Latest research results have proved that ultrasound irradiation is both time and cost-effective approach for any bio-processes like enhancement of emulsification and trans-esterification of fatty acids for bio-fuel products. Bio-process monitoring and dewatering of sludge have also been accelerated. 

Effects of sonochemistry

These are both chemical and physical effects in which chemical falls under homogeneous sonochemistry of liquids, heterogeneous sonochemistry of liquid-liquid or liquid-solid systems, and sonocatalysis. Based on earlier studies, effects of ultrasound on slurries of inorganic solids are shown.

 Parameter

Application of sonochemistry

1. ultrasonic Dispersion of Nanostructured inorganic materials

Over the past few years sonochemical reactions have been chosen for a general approach towards the synthesis of nanophase materials. Due to distinct behaviour of nanosized material compared to the bulkier ones . These small clusters have electronic structures with high density. Both gas phase and liquid phase techniques are used to synthesis them. With these different phase techniques and also their combination, the sonochemical approach is included.

2. sonochemistry in Nanomaterial Preparation

    In recent years, sonochemical methods have become a useful technique for preparing new materials with special properties. The special physical and chemical environment caused by acoustic cavitation has provided an important way for scientists to prepare nanomaterials. Various forms of nanostructured materials with high catalytic performance can be obtained when sonochemically decomposes volatile organometallic precursors in high-boiling solvents. The preparation methods mainly include ultrasonic atomization decomposition method, metal organic matter ultrasonic decomposition method, chemical precipitation method and sonoelectrochemical method. For example, the precipitation method is one of the most promising methods in the wet chemical method for preparing nanomaterials.

Excellent physical performance. The size of the precipitated particles produced by this method mainly depends on the relative rates of nuclei growth and growth. If an ultrasonic field is introduced, on the one hand, the high temperature and high pressure environment generated by ultrasonic cavitation provides the system with energy to overcome the nucleation energy barrier from the interface energy during the formation of tiny particles, which increases the nucleation rate by several orders of magnitude; , plus a large number of microscopic particles generated on the surface of solid particles by ultrasonic cavitation

Small bubbles will interfere with the orderly arrangement of the crystal ions, which is not conducive to the further growth of the crystal nucleus. On the other hand, the mechanical effects of crushing, emulsification, stirring, etc. produced by the high-pressure shock waves and micro-jets generated by ultrasonic cavitation can effectively prevent the growth and agglomeration of crystal nuclei within a certain period of time, making the distribution of tiny particles more uniform. The above reasons cause the nanoparticles synthesized by the ultrasonic precipitation method to have smaller particle size and better dispersibility than those synthesized without ultrasound.

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