期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 36, 期 -, 页码 553-557出版社
BLACKWELL MUNKSGAARD
DOI: 10.1107/S0021889803005028
关键词
carbon nanotubes; polyelectrolytes; dispersion; small-angle scattering; reinforcing fillers
Small-angle light scattering and ultra small-angle X-ray scattering are used to assess the morphology of single-walled ( SWNTs) and multi-walled carbon nanotubes (MWNTs). For MWNTs, a power-law scattered-intensity profile with a slope of - 1.08 is consistent with the rod-like morphology. For SWNTs, however, scattering profiles characteristic of rod-like morphology are not observed on any length-scale from 1 nm to 50 mum. Rather, disordered objects are found that we identify as a network of carbon ropes enmeshed with polyelectrolyte dispersants. The effectiveness of polyelectrolyte dispersants is assessed using small-angle light scattering in conjunction with exposure to ultrasound. In the presence of an anionic polyelectrolyte, sonication can assist dispersion of both SWNTs and MWNTs. In the presence of a cationic agent, however, sonication can induce aggregation. SWNTs respond differently to ultrasound depending on whether residual synthesis catalyst is present. Four dispersants are studied, of which sodium polystyrene sulfonate is the most effective and polyallylamine hydrochloride is the least effective.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据