石墨烯迷你马达的自组装制备及其乙醇驱动运动和油品吸附性能

Self-assembly of Graphene Mini-motor and Its Ethanol-Driven Motion and Oil Adsorption Properties

石墨烯三维(3D)宏观体多集中在厘米尺度并为实心对称结构,且存在“小尺寸”和“低密度”难以协调的矛盾。本文以氧化石墨烯为前驱体、苯胺为交联剂,在电动搅拌下通过剪切力驱动聚集和毛细管力干燥协同自组装制备球状氧化石墨烯水凝胶,经过高温还原得到石墨烯迷你马达。所得石墨烯迷你马达具有尺寸小(直径2~5 mm)、密度低(0.2~0.7 g/cm^3)、内部空心结构以及疏水亲油的性能。上述结构特征赋予其乙醇驱动运动和油品吸附性能。研究表明,充分浸泡乙醇的石墨烯迷你马达在水中可以展现出自转速度3 r/s的无规则快速运动;对水中植物油的饱和吸附量约为794.9 mg/g。

The preparation of three dimensional(3D)graphene hydrogels is mostly concentrated on the centimeter scale and solid symmetrical structures while the contradiction between small size and low density exists.The graphene mini-motor constructed by the combination of shear-driven aggregation and capillary force induced drying followed by high temperature reduction using graphene oxide suspension as the precursor and aniline as the crosslinking agent.The graphene mini-motor shows ethanol-driven motion and oil adsorption performance because of its small size(about 2~5 mm in diameter),low density(about 0.2~0.7 g/cm^3),hollow structure and hydrophobic oleophilicity.It is found that the fastest speed of ethanol-driven rotation can reach 3 r/s,and the saturated adsorption capacity is 794.9 mg/g.