Single-step total fractionation of single-wall carbon nanotubes by countercurrent chromatography.

Single-step total fractionation of single-wall carbon nanotubes by countercurrent chromatography.
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DOI:
10.1021/ac5003189
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发表时间:
2014-04-15
影响因子:
7.4
通讯作者:
Zheng, Ming
Zheng, Ming
中科院分区:
化学1区
文献类型:
--
作者:
Zhang, Min;Khripin, Constantine Y.;Fagan, Jeffrey A.;McPhie, Peter;Ito, Yoichiro;Zheng, Ming

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开发简单的方法将单壁碳纳米管(SWCNT)的合成混合物破碎成单个物种对许多应用至关重要。用于单手性SWCNT纯化的现有方法是繁琐的,通常需要多个步骤和针对不同物种的不同条件。在这里,我们报告了一种方法,以实现总分馏的合成单壁碳纳米管混合物的逆流色谱法,导致许多单手性单壁碳纳米管物种在一个单一的运行纯化。该方法基于脱氧胆酸钠分散的单壁碳纳米管在聚乙二醇/葡聚糖双水相体系中的可调分配。通过使用0.02%脱氧胆酸钠和0.1%至0.7%(w/w)的十二烷基硫酸钠梯度运行移动的流动相,我们观察到清晰的直径依赖性洗脱,总回收率约为90%。在所收集的所有组分中,其中一些组分富含单手性(9,4),(7,5),(7,6),(8,3),(6,5)物种,而其余大多数组分含有不超过2-3个主要物种。我们还观察到强烈的(n,m)依赖性洗脱峰宽度由于对映体分辨分区。这些结果表明,CCC作为一种有效的方式,以获得高纯度(n,m)的物种,并建议CCC作为一种分析工具的合成单壁碳纳米管混合物的手性分布映射的潜力。
Development of simple processes to fractionate synthetic mixtures of single-wall carbon nanotubes (SWCNTs) into individual species is crucial to many applications. Existing methods for single-chirality SWCNT purification are cumbersome, often requiring multiple steps and different conditions for different species. Here, we report a method to achieve total fractionation of a synthetic SWCNT mixture by countercurrent chromatography, resulting in purification of many single-chirality SWCNT species in a single run. This method is based on tunable partition of sodium deoxycholate dispersed SWCNTs in polyethylene glycol / dextran aqueous two-phase system. By running the mobile phase with 0.02% of sodium deoxycholate and a gradient of sodium dodecyl sulfate from 0.1% to 0.7% (w/w), we observe clear diameter-dependent elution, with ~ 90% total recovery. Among all the fractions collected, a number of them are enriched in single-chirality (9,4), (7,5), (7,6), (8,3), (6,5) species, while most of the remaining ones contain no more than 2-3 major species. We also observe strong (n,m)-dependent elution peak width due to enantiomer-resolved partition. These results demonstrate CCC as an effective way to obtain high purity (n, m) species, and suggest the potential of CCC as an analytical tool for chirality distribution mapping of synthetic SWCNT mixtures.
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