INFLUENCE OF THE SHAPE OF THE ULTRASONIC EMITTERS ON THE EMISSION POWER AND INTENSITY OF GRAPHITE EXFOLIATION
Abstract
In the present paper, an assessment of the effective energy intensity, power and density of the flow of mechanical energy of ultrasonic radiation, which is transmitted by installations with different power with cylindrical emitters with different cross-section area (from 0.2 to 1.76 cm2), as well as one mushroom-shaped emitter (cross-section 1.76 cm2) during the grinding of natural graphite in aqueous suspensions, was carried out. Measurements were performed by calorimetric method based on the heating rate of liquid. It has been shown that with decrease in the cross-section of the ultrasonic emitter, effective power of the transmitted ultrasonic mechanical vibrations increases. Using laser diffraction technique, as well as conductometry and turbidimetry of suspensions as integral research methods, the dependences of average particle sizes, electrical conductivity and turbidity of aqueous suspensions of natural graphite on the effective power of ultrasonic radiation for two installations with different acoustic power at processing time of 1 and 6 h were obtained. These results showed decrease in the average particle size, increase in the electrical conductivity and turbidity of suspensions with increase in the effective power transmitted by the ultrasonic emitter. It was also shown that increase in the effective transmitted power at the emitter 4 times (from about 7 to 28 W) does not lead to a noticeable change in particle size, however, the specific electrical conductivity and turbidity of suspensions significantly increases. Achieved level of average particle sizes (less than 10 μm), electrical conductivity (more than 150 μS/cm) and turbidity (about 300 NTU) of suspensions indicates exfoliation of natural graphite into few-layered graphene particles based on published experimental data. The results obtained in the present work are important for the design of industrial graphene production units.
For citation:
Nakhodnova A.V., Danilov E.A., Goncharova N.N., Vorkhlik A.V., Samoilov V.M. Influence of the shape of the ultrasonic emitters on the emission power and intensity of graphite exfoliation. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2022. V. 65. N 7. P. 115-121. DOI: 10.6060/ivkkt.20226507.6675.
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