Comparison of the stability of multiwalled carbon nanotube dispersions in water
Comparison of the stability of multiwalled carbon nanotube dispersions in water
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DOI：
10.1039/b708460a
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发表时间：
2007-01-01
影响因子：
3.3
通讯作者：
Khlobystov, Andrei N.
中科院分区：
文献类型：
--
作者：
Marsh, Dan H.;Rance, Graham A.;Khlobystov, Andrei N.
使用紫外-可见光谱连续实时监测水溶液中的纳米管浓度可以定量比较不同类型纳米管分散体的稳定性。 e 的系统调查。纳米管长度和功能化对薄多壁碳纳米管 (MWNT) 的影响表明，较短的 MWNT 比较相同直径的较长纳米管形成更稳定的分散体。在没有表面活性剂或增溶官能团的情况下，MWNT 平均长度缩短至约 1 mm，在水中形成稳定的分散体，浓度高达 0.013 mg ml(-1)。在缩短的纳米管表面引入羧基或硫醇基团进一步提高了MWNT分散体的稳定性（高达0.24 mg ml(-1)）。在 MWNT 上引入表面活性剂或表面电荷对官能化和非官能化纳米管具有截然不同的影响，分别使其分散体不稳定和稳定。
Continuous real-time monitoring of the nanotube concentration in aqueous solution using UV-Vis spectroscopy allows quantitative comparison of the stability of different types of nanotube dispersions. Systematic investigation of the e. ects of nanotube length and functionalisation for thin multiwalled carbon nanotubes ( MWNT) has revealed that shorter MWNT form more stable dispersions than longer nanotubes of the same diameter. MWNT shortened to an average length of approximately 1 mm form stable dispersions in water with concentrations up to 0.013 mg ml(-1) in the absence of surfactants or solubilising functional groups. The introduction of carboxylic or thiol groups on the surface of shortened nanotubes further increases the stability of MWNT dispersions ( up to 0.24 mg ml(-1)). The introduction of surfactant or surface charge on MWNT has contrasting effects on functionalised and non-functionalised nanotubes, destabilising and stabilising their dispersions, respectively.