Nano-structural investigations of porous silica coated carbonaceous spheres and dielectric properties of its organosilicone hybrid film

Abstract

In this research, a series of carbonaceous spheres samples were synthesized by hydrothermal carbonization of glucose and cyclodextrin, and coated with mesoporous silica. The unique nano-structure of such carbonaceous spheres samples was fully characterized by DLS, XRD, SEM, TEM, Raman spectroscopy and infrared spectroscopy techniques. Such carbonaceous spheres samples were then blended with organosilicone in order to prepare a series of hybrid films. The influence of the added silica coated carbonaceous spheres on the dielectric property of these hybrid film samples was thoroughly investigated. The results indicate that the silica coated carbonaceous spheres are amorphous and have a typical core-shell structure. Such nano-structure and aggregation behavior in the organosilicone matrix can introduce more interfaces into the hybrid organosilicon film samples, and have notably affected the dielectric property of the hybrid organosilicon film samples. The dielectric constant and dielectric loss of the hybrid film samples could be kept relatively low if the introduced interfaces were blurred enough to avoid the interfacial polarity.

Keywords:

• Dielectric properties
• Films
• Carbonaceous spheres
• Nanostructure
• Silicones

Additional information

Funding

The work was supported by Science and Technology Planning Project of Zhaoqing City (2015B010902010), and Science and Technology Project of Administration of quality and Technology Supervision of Guangdong Province (2017CT30).