东南大学学报（英文版）2020，Vol.36Issue(1)：67-72,6.DOI:10.3969/j.issn.1003-7985.2020.01.009
石墨烯在硅烷偶联剂水溶液中的分散性能
Dispersion of graphene in silane coupling agent aqueous solutions
摘要
Abstract
In order to reduce the agglomeration of nanographene and improve its dispersibility, six silane coupling agents were used to modify the surface of the nanographene particles. Visual inspection, Fourier-transform infrared spectroscopy, transmission electron microscopy, Raman spectroscopy, and X-ray diffraction were employed to evaluate the dispersion properties of the resulting graphene in an aqueous solution of silane coupling agents. Results show that all six types of silane coupling agents are efficient in promoting the dispersion of graphene in aqueous solutions, and no obvious sedimentation of the graphene dispersion solution is observed after a stationary storage period of 30 d. Taking 3-aminopropyltriethoxysilane ( KH-550 ) as an example, after the graphene is dispersed in the KH-550 aqueous solution, the carboxyl group on the surface of the graphene reacts with the KH-550 amino group to form an amide bond, and KH-550 is successfully grafted onto the graphene surface. Polar functional groups ionize in water, creating an electrostatic repulsion effect, or hydrophilic functional groups form hydrogen bonds with water molecules, which is believed to improve the dispersion stability of graphene. The dispersed graphene is curled and contains many folds. Each fold has about three or four layers, with an interlayer spacing of about 0. 65 nm. The dispersed graphene also has a complete lattice and a reduced number of defects. Nanographene disperses well in silane coupling agent aqueous solutions and can, therefore, be used to prepare cement-based composites.关键词
石墨烯/硅烷偶联剂/表面改性/分散性Key words
graphene/silane coupling agent/surface modification/dispersibility分类
建筑与水利引用本文复制引用
郭丽萍,王虹,陈波,钱文勋..石墨烯在硅烷偶联剂水溶液中的分散性能[J].东南大学学报（英文版）,2020,36(1):67-72,6.基金项目
The National Key R&D Program of China ( No. 2018YFC0406701) , the National Natural Science Foundation of China ( No. 51778133, 51739008) . （ No. 2018YFC0406701）
