Study on preparation and properties of graphene/Ca(OH)₂ nanocomposite in different temperatures

Graphene/Ca(OH)₂ nanocomposite has a good consolidation effect on weathered marble artifacts. Preparation of this kind of material with excellent performance at lower temperatures plays an important role on its cost reduction and popularization. In this study, a series of graphene/Ca(OH)₂ nanocomposites were prepared by adjusting the reaction temperature and addition of graphene quantum dot. The morphology, composition, relative kinetic stability, carbonation reaction and reinforcement property were studied by transmission electron microscope, laser particle analyzer, Raman spectroscopy, Fourier-transform infrared spectroscopy, UV-visible spectrometer, X-ray diffractometer, scanning electron microscope, colorimeter, mercury injection apparatus, leeb hardness tester and ultrasonic tester. The results showed that the appropriate increase of reaction temperature was conducive to the improvement of combination and the reduction of nanoparticle size. The products obtained at 80℃ exhibited good relative kinetic stability, fast carbonation rate and excellent reinforcement property, while the materials prepared at 90℃ and above grew into spherical crystals and did not show better properties, may due to the influence of calcium hydroxide transform to vaterite.