物理化学学报2003，Vol.19Issue(11)：993-995,3.
纳米金刚石解团聚的一种新方法--石墨化-氧化法
A New Method for Deaggregation of Nanodiamond from Explosive Detonation--Graphitization-Oxidation Method
徐康 1薛群基1
作者信息
- 1. 中国科学院兰州化学物理研究所,固体润滑国家重点实验室,兰州,730000
- 折叠
摘要
Abstract
Nanodiamond (ND) prepared by explosive detonation has primary particles of 4 ～6 nm in diameter, but itundergoes severe aggregation in forming aggregates of hundreds of nm, even several μm in diameter. A new method forthe deaggregation of nanodiamond (ND) is developed and some preliminary results using this method are presented: NDis first graphitized in nitrogen at 1 000 ℃ during which thin graphite layers are formed on the surface of the diamondparticles and at the particle boundaries. The sample is then oxidized by air at 450 ℃ to remove the formed graphite lay-ers. After such treatment the sample is suspended in water by ultrasonics, and the particle size distributions were mea-sured by the laser scattering method. It has been found that the diameter of about 50% ( w ) of the ND particles can be re-duced to less than 50 nm, while such ultrafine particles are absent in the suspension of the untreated ND. It is suggestedthat the deaggregation is caused by the removal of the graphite layers formed at the particle boundaries in the stage ofoxidation. It is also found that after oxidation, some aggregates with larger diameters (1 000 ～ 2 000 nm) are formed,which can be explained by the formation of inter-particle ethereal bondings (C -O -C) during the oxidation by air.关键词
纳米金刚石/解团聚/石墨化/氧化Key words
Nanodiamond (ND)/Deaggregation/Graphitization/Oxidation分类
化学化工引用本文复制引用
徐康,薛群基..纳米金刚石解团聚的一种新方法--石墨化-氧化法[J].物理化学学报,2003,19(11):993-995,3.
