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In order to improve the safety and stability of transmission systems, nanocomposite dielectrics have been widely concerned by researchers. The dispersion of nano-fillers in dielectrics is critical to material properties. But a comprehensive and non-destructive method of microscopic characterization for the dispersion of nano-fillers is still waiting to be discovered. In this paper, nano-magnesium oxide (MgO) modified epoxy resin sheets with different dispersion degrees were prepared by physical and chemical methods. Nonlinear ultrasonic method and scanning electron microscope (SEM) imaging were conducted. The results show that the second-order ultrasonic nonlinear parameter of the sample is positively correlated with the agglomeration degree of nanoparticles. The average diameter of nanoparticles increases with the agglomeration degree of the nanoparticles. These findings reveal an important new strategy for evaluating the reliability of nano modification for nanodielectrics.
Inspec keywords: nanofabrication; magnesium compounds; nanocomposites; resins; ultrasonic materials testing; nanoparticles; scanning electron microscopy
Subjects: Nanotechnology industry; Nanofabrication; Testing; Acoustic properties (mechanical engineering); Engineering materials