| Progress in science and technology keeps pushing the developing needs for high precision equipment.Thermal expansion will reduce accuracy,stability of equipment,what is more,cause accidents that threating lives and properties.The unique crystal structure granting 2D graphene high fracture strain rate,specific surface area and chemical stability.3D graphene aerogel,which is assembled by 2D graphene flake,not only inherit the superior properties of 2D graphene,but also possess properties like high porosity and low density.All these excellent performances have promised the application of 3D aerogel.However,graphene aerogel that prepared through hydrothermal method is weak in both stiffness and controlling.In this study,we design the microstructure of 3D graphene from the basic graphene flake unit.We regulate graphene aerogel with double-negative-index?negative thermal expansion coefficient and negative Poisson's ratio?so that it could shrink at the stimulation of heating,and be strengthen at the stimulation of micro-strain.In this study,we mainly focus on:1)By adjust the parameters in 3D graphene preparation,realize the assembly mechanism of micropore.Design and control the structured preparation of the topography of 2D graphene flake and the microporous of graphene material.2)By controlling the topography of 2D graphene flake and the microporous of graphene material,achieve the structure design of graphene aerogel and produce aerogel with tunable negative thermal expansion(-1.04×10-6-7.56×10-6/?).3)By controlling the topography of 2D graphene flake and the microporous of graphene material,achieve the tunable negative Poisson's ratio of graphene aerogel?0-0.3?.In addition,strengthen the mechanical properties of graphene aerogel by the addition of CNT and CTAB. |
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