水性介质中纳米金刚石分散行为研究

文章探讨了不同分散剂在分散纳米金刚石颗粒时的作用机制,包括静电位阻、空间位阻、静电-空间位阻协同机制;同时研究了不同分散剂、用量、分散时间以及搅拌时间等对纳米金刚石分散的影响。研究结果表明,在高能机械化学处理过程中,在机械力和表面活性剂、无机电解质等物质的共同作用下,纳米金刚石的表面官能团组成发生了明显的变化,从而导致颗粒表面电性发生改变,颗粒间斥力增大,颗粒更加亲水,从而使得颗粒可以在体系中保持稳定分散。

The dispersion behavior of nano-diamond in aqueous medium

The action mechanism of different dispersants in the dispersion of nano-diamond particles is investigated,which includes the electro-static hindrance,steric hindrance and their synergistic effect.The effects of the different dispersants,the amount of dispersant,the dispersing time,and the mixing time on the dispersion of nano-diamond are analyzed.The results show that the constitution of the surface-functional groups of nano-diamond has changed obviously at the high-energy-mechanical and different chemical processes and the combined effects of mechanical forces,surfactants and inorganic electrolyte.It leads to the surface charge changing,the repulsion between the particles increasing,the particles closer to the water.Therefore,the stable dispersion system was established.