UC知道有化学高手吗
来源：百度知道 编辑：UC知道 时间：2024/05/16 06:57:52
Several methods [1–3] for large scale synthesis of
carbon nanotubes have opened the door to studying their
physical and chemical properties, which were expected to
be unique [4,5]. However, the as-prepared carbon
nanotubes usually contain a large amount of impurities,
such as metal particles, amorphous carbon, and multishell
carbon nanocapsules. Such impurities are a serious impedi-
ment to detailed characterization of the properties of the
nanotubes.
There are several reports [6–12] on purification of
multi-walled carbon nanotubes (MWNTs). One of the
efficient purification methods was oxidation in air at
temperatures around 7508C [6]. Owing to the small
difference in reactivity between MWNTs and nanoparti-
cles, pure MWNTs were obtained in the risk of burning off
99 wt.% of the sample after prolonged oxidation [6].
Another purification method was based on liquid-phase
oxidation usin
这要请英语高手来～～～～～～～
什么东西啊 !~
a
晕，这不是化学高手的事吧
几个方法[ 1.C3 ] 为碳nanotubes 大规模综合对学习打开了门他们的物理和化工物产, 被预计是独特的[ 4,5 ] 。但是, 和准备的碳nanotubes 通常包含很多杂质, 譬如金属微粒, 无定形的碳, 和multishell 碳nanocapsules 。这样杂质是一严肃的impedi- ment 对nanotubes 的物产的详细的描述特性。有几个报告[ 6.C12 ] 关于多被围住的碳nanotubes (MWNTs 的) 洗净。高效率的洗净方法的当中一个是氧化作用在空气里在温度在7508C [ 6 附近] 。由于在反应性上的小区别在MWNTs 和nanoparti- cles 之间, 纯净的MWNTs 被获得了在烧掉样品的99 wt.% 风险在长时期的氧化作用[ 6 以后] 。其它洗净方法如此根据液体阶段的氧化作用使用KMnO /H 解答[ 7 ] 。电子4 2 4 个显微学图象表示, 残余的碳样品完全包含了纯净的nanotubes, 但, 管看上去严厉地被损坏[ 7 ] 。陈・等。[ 8 ] 一种有趣的方法向根据石墨intercalation nanotubes 的洗净报告。他们的结果表示, nanotubes 比碳nanoparticles 是较不易受bromination, 并且随后热化在空气里在5308C 导致被设置的碳的优先破坏。但是, 金属微粒仍然依然是在产品。在本文里, 我们报告净化碳nanotubes 一个multi-step 方法, 能有效地取消金属微粒, 无定形的碳和multishell 碳nanocapsules 。此外出产量能接近50% 。为了阐明bromination 的作用在净化MWNTs, 一个multi-step 方法以bromination 和没有bromination 使用净化同样批和准备的产品。结果显露, bromination 充当了在净化MWNTs 的一个巨大角色。