石墨烯气凝胶增韧水泥复合材料的研究

Study on the Cement Composites Toughened by Graphene Aerogel

石墨烯片层在水泥中的稳定性和分散性是发挥石墨烯增韧作用的关键。本文通过将石墨烯片层转化成气凝胶状态,实现石墨烯片层在三维尺度上的均匀分散,随后将其引入到水泥体系中,考察石墨烯气凝胶对水泥基复合材料力学性能的影响。使用傅立叶变换红外光谱仪、X射线光电子能谱、激光显微拉曼光谱、扫描电子显微镜、万能试验机、动态机械性能等对材料的表面化学状态、微观形貌和力学性能进行表征。结果表明,通过Hummers氧化法结合水热反应工艺,可以成功制备出性质较稳定的石墨烯气凝胶,且气凝胶中碳原子特性与石墨烯片层碳原子特性接近。石墨烯气凝胶对水泥基材料具有较为明显的增韧作用,体现了较大的应用潜力。

The stability and dispersion of graphene lamellae in cement are the key points to play the toughening role of graphene.In this paper,the graphene lamellae were transformed into aerogel to achieve uniform dispersion of graphene sheets on three dimensional scales.Subsequently,the graphene aerogels were introduced into the cement system to investigate the effect of graphene aerogels on the mechanical properties of cement composites.Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,laser micro-Raman spectroscopy,scanning electron microscopy,universal testing machine and dynamic mechanical properties were used to characterize the surface chemical state,micro-morphology and mechanical properties of the materials.The results show that the graphene aerogels with relatively stable properties can be prepared by Hummers oxidation method combined with hydrothermal reaction process,and the characteristics of carbon atoms in aerogels are similar to those of graphene lamellar carbon atoms.Graphene aerogels have obvious toughening effect on cement-based materials,which shows great potential for application.