Abstract The microstructure design of the packing is a crucial factor in determining the performances of sealing capacity. Graphene aerogel/TiO2 (GA/TiO2) composites were fabricated by an infiltration method using porous GA as a framework. GA with different pore sizes and morphologies was tuned by changing concentration of graphene. The structural morphology of the graphene layer structure transformed into porous structure as the graphene concentrations increased. In addition, mechanical properties and tribological behaviors of GA/TiO2 composites with different graphene concentrations were comparatively investigated. The results show that the TiO2 particles are more uniformly filled into the GA with higher graphene concentration due to the porous separation effect. Therefore, the GA/TiO2 composites of higher concentrations have a better elongation and mechanical properties. Simultaneously, the tribological behavior is excellent owing to the self-lubricating properties of graphene and tiny TiO2, and the TiO2 cluster can effectively prevent the crack propagation. Moreover, the tribological performance of the GA/TiO2 samples under wet friction conditions is better than that under dry friction conditions due to the self-transport operation of lubricants assisted by the through capillary action, besides the self-lubricating effect of graphene and tiny TiO2 particles.

中文翻译：

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石墨烯浓度通过可控蜂窝结构对石墨烯气凝胶/TiO2复合材料摩擦学性能的影响

摘要 填料的微观结构设计是决定密封性能的关键因素。石墨烯气凝胶/TiO2（GA/TiO2）复合材料是通过渗透法使用多孔GA作为框架制备的。通过改变石墨烯的浓度来调整具有不同孔径和形态的 GA。随着石墨烯浓度的增加，石墨烯层结构的结构形态转变为多孔结构。此外，比较研究了不同石墨烯浓度的GA/TiO2复合材料的力学性能和摩擦学行为。结果表明，由于多孔分离效应，TiO2 颗粒更均匀地填充到石墨烯浓度较高的 GA 中。所以，较高浓度的 GA/TiO2 复合材料具有更好的伸长率和机械性能。同时，由于石墨烯和微小二氧化钛的自润滑特性，摩擦学性能优异，二氧化钛团簇可以有效阻止裂纹扩展。此外，GA/TiO2 样品在湿摩擦条件下的摩擦学性能优于干摩擦条件下的摩擦学性能，这是由于通过毛细管作用辅助润滑剂的自运输操作，以及石墨烯和微小 TiO2 的自润滑作用。粒子。