碳纳米管-石墨烯气凝胶的制备与性能

以混合均匀的碳纳米管(CNTs)-石墨烯(GR)分散液为前驱液,质量分数为3.0%的1788-聚乙烯醇(PVA)溶液为有机物黏结剂,通过冷冻干燥法制备了轻质、平整和易切削的CNTs-GR气凝胶。采用TEM、SEM、压缩试验机和比表面积测试仪等对样品的微观形貌结构和力学性能进行了表征。结果表明,CNTs-GR混合分散液的质量分数为3.0%、CNTs与GR的质量比为5∶3时,得到的气凝胶呈现不同尺寸等级的气孔且分布最均匀;PVA在气凝胶的形成中有效地抵抗样品收缩变形;固体物的质量与样品的密度严格线性负相关,满足y=-0.125x+106.26函数关系式;N2吸附脱附检测显示气凝胶的比表面积为138.77m2/g,介孔在气凝胶中占主导部分,平均孔直径为46.6nm,孔隙率可达97%;且样品的压缩过程出现了三个不同阶段的弹性变形,并能最终恢复到原始尺寸。

Preparation and properties of CNTs-graphene aerogel

Homogeneous carbon nanotubes (CNTs)-graphene (GR)dispersion was used as the precursor solu-tion,and the 3.0wt% of 1788-polyving alcohol (PVA)solution as organic binder to fabricate the lightweight, smooth and good mechanical cutting performance CNTs-GR aerogel by freeze drying technique.Microstructures and mechanical properties were characterized by TEM,SEM,compression testing machine and the specific surface area measuring instrument.Results suggest that when the mass fraction of CNTs-GR hybrid solution is 3% and the mass ratio of CNTs and GR is 5:3,hierarchical dimension of pores are presented,and the pores distribution is the most uniform in the aerogel.The contraction distortion of the sample can be prevented effectively by using the PVA as a binder.The mass of the solid object is minus a linear correlation with the density of the sample,matching the func-tion relational expression of y =-0.125x+106.26.And the specific surface area of aerogel is 138.77 m2/g,meso-porous account for the majority of the aerogel,the average pore diameter is 46.6 nm according to the N2 adsorption-desorption test and the porosity can reach 97%.The samples appear three distinct stages of plastic deformation dur-ing the compressive testing and reply to the prototype at last.