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Synthesis of nano scale materials with required size has been fascinating for many researchers and different methods have been developed for controlling the dimensions of particles during synthesis phase. In this paper, the role of ultrasonic irradiations on synthesis of zinc oxide nano particles and the consequent changes of their dimensions are investigated. Primary colloid of zinc oxide was produced using magnetic stirrer and then the colloid was exposed to ultrasonic probe irradiations. For a certain time called optimum time, exposure to ultrasound improves the output of the synthesized ZnO to double the value of the initially produced one. This increase in production of ZnO nano particles is measured by amount of absorption edge. Before and after the optimum time, mean radius of the produced nanoparticles are smaller than the primary one, and linearly reduces along with increasing the exposure time to ultrasound. Similar result is previously reported partially. These experimentation on ZnO show time rate of reaction of particle size depends on pulse time and intensity of the ultrasound exposed.

Keywords: : ZnO nanoparticle colloid, Ultrasonic Probe, UV/visible absorption spectrum, Wavelength absorption edge, Ultrasonic bubble

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