Abstract
Nanostructured composite particles of nano- and submicron sizes were synthesized by a combination of sol–gel and sonochemical techniques. Their graphene content was 0.8–0.9 wt%. These layered particles consisted of graphene sheets in which zirconia nanocrystals were discretely incorporated. The synthesized powders were characterized using XRD, TEM, HRTEM, diffusion aerosol spectrometry and elemental analysis. A comparison of the compressibility modulus, limit values of linear section deformation and compressibility factor shows that the compressibility of the composite is difficult to achieve compared to that of pure zirconia, apparently, due to the low elasticity of graphene sheets.
Highlights
IntroductionComposites consisting of graphene sheets and zirconia are promising materials for various industrial elds due to their physicochemical characteristics (excellent mechanical, electrical, thermal, optical and stable photochemical)
The use of nanostructured powders allows obtaining materials with high density and electrical conductivity
In the obtained composite graphene–zirconia powders, the carbon content was 0.80–0.90 (Æ0.02) wt%. It was incorporated into the composite structure as nanometer thickness graphene sheets (Fig. 2a), in which, the absence of oxygen was proved by the EELS analysis earlier.[34]
Summary
Composites consisting of graphene sheets and zirconia are promising materials for various industrial elds due to their physicochemical characteristics (excellent mechanical, electrical, thermal, optical and stable photochemical). The uniqueness of this method lies in the combination of sol–gel synthesis and ultrasonic exfoliation of graphene sheets from the surface of synthetic graphite in an organo–inorganic medium and in the synthesis of sol and in the exfoliation of graphene in the same organic amine.[34,35,36] This method ensures an uniform distribution of components in the nanopowders, almost every nanocrystal of metal oxide is wrapped with a graphene sheet Such nanostructured powders as raw products are very interesting and promising for the synthesis of new types of ceramics with improved physicochemical properties. We combined physicochemical characterization and the rheological test results of the powders
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