基于物理及化学改性制备高分散性石墨烯试验

Preparation of Highly Dispersed Graphene Based on Physical and Chemical Modifications

纳米石墨烯具有疏水性强、比表面积大等特点,片层间极易产生相互作用导致团聚,而石墨烯大部分优异性能仅限于单层或少层结构,石墨烯分散性差严重制约其产业化,亟需制备高分散性石墨烯水分散液。以自制石墨烯为原料,通过物理分散试验和化学接枝改性试验,探究不同手段对石墨烯分散液稳定性的影响。结果表明,石墨烯质量浓度为1.0 g/L,聚丙烯酸与石墨烯质量比为4∶1,超声仪功率为300 W,搅拌速度为250 r/min,处理时间为8 h,可获得分散率为95.58%、zeta电位为-41.4 mV的高分散高稳定性石墨烯水分散液,静置30 d未出现肉眼可见聚沉现象。

Nanographene has strong hydrophobicity and large specific surface area.Lamellar interactions can easilu lead to agglomerate,while most of the excellent properties of graphene are limited to single-layer or few-layer.Therefore,the poor dispersion of graphene seriously restricts its industrialization,and the preparation of highly dispersed graphene aqueous dispersion has become an urgent problem.In this experiment,the effect of different methods on the stability of graphene dispersion was investigated by physical dispersion test and chemical grafting modification test using self-made graphene as raw material.The results showed that when graphene concentration was 1.0 g/L,mass ratio of polyacrylic acid to graphene was 4∶1,ultrasonic power was 300 W,stirring speed was 250 r/min,and treatment time was 8 h,a highly dispersed and stable graphene aqueous dispersion with a dispersion rate of 95.58%and a zeta potential of-41.4 mV was obtained.After standing for 30 days,there was no visible agglomeration phenomenon.