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首页> 外文期刊>Environmental Pollution >Surfactive Stabilization Of Multi-walled Carbon Nanotube Dispersions With Dissolved Humic Substances
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Surfactive Stabilization Of Multi-walled Carbon Nanotube Dispersions With Dissolved Humic Substances

机译：具有溶解腐殖质的多壁碳纳米管分散体的表面活性稳定

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Soil humic substances (HS) stabilize carbon nanotube (CNT) dispersions, a mechanism we hypothesized arose from the surfactive nature of HS. Experiments dispersing multi-walfed CNT in solutions of dissolved Aldrich humic acid (HA) or water-extractable Catlin soil HS demonstrated enhanced stability at 150 and 300 mg L~(-1) added Aldrich HA and Catlin HS, respectively, corresponding with decreased CNT mean particle diameter (MPD) and polydispersivity (PD) of 250 nm and 03 for Aldrich HA and 450 nm and 0.35 for Catlin HS. Analogous trends in MPD and PD were observed with addition of the surfactants Brij 35, Triton X-405, and SDS, corresponding to surfactant sorption maximum. NEXAFS characterization showed that Aldrich HA contained highly surfactive domains while Catlin soil possessed a mostly carbohydrate-based structure. This work demonstrates that the chemical structure of humic materials in natural waters is directly linked to their surfactive ability to disperse CNT released into the environment.
机译：土壤腐殖质（HS）稳定了碳纳米管（CNT）的分散体，我们推测这是由于HS的表面活性引起的。在溶解的Aldrich腐殖酸（HA）或水提取的Catlin土壤HS溶液中分散多波纹CNT的实验表明，分别添加Aldrich HA和Catlin HS的150和300 mg L〜（-1）时，稳定性增强，碳纳米管减少对于Aldrich HA，平均粒径（MPD）和多分散性（PD）为250 nm和03，对于Catlin HS，平均粒径（MPD）和多分散性（PD）为450 nm和0.35。加入表面活性剂Brij 35，Triton X-405和SDS可以观察到MPD和PD的类似趋势，这对应于表面活性剂的最大吸附量。 NEXAFS表征表明，Aldrich HA包含高活性域，而Catlin土壤则主要具有基于碳水化合物的结构。这项工作表明，天然水中腐殖质材料的化学结构直接与它们散布释放到环境中的CNT的表面活性有关。

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