Purification of Single-Wall Carbon Nanotubes by Controlling the Adsorbability onto Agarose Gels Using Deoxycholate
Purification of Single-Wall Carbon Nanotubes by Controlling the Adsorbability onto Agarose Gels Using Deoxycholate
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DOI：
10.1021/jp301380s
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发表时间：
2012-04
影响因子：
3.7
通讯作者：
A. Hirano;Takeshi Tanaka;Y. Urabe;H. Kataura
中科院分区：
文献类型：
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作者：
A. Hirano;Takeshi Tanaka;Y. Urabe;H. Kataura
单壁碳纳米管（SWCNT）工业化的关键挑战之一是将高度纯化的SWCNT分离成金属和半导体物质的商业规模生产。在本研究中，单壁碳纳米管的纯化，即，通过定量和控制它们在琼脂糖凝胶上的吸附性来进行无定形碳或成束SWCNT的去除。通过假定Langmuir等温线实现吸附性的定量，并且使用0.05-1%脱氧胆酸钠（DOC）来控制吸附性。结果表明，DOC的吸附能力与DOC的浓度有关。在低DOC浓度（约0.05%）下，杂质如无定形碳或成束的SWCNT优先吸附到凝胶上，而在中等DOC浓度（约0.05%）下，杂质如无定形碳或成束的SWCNT优先吸附到凝胶上。0.25%）时，高纯度的单壁碳纳米管主要吸附在凝胶上。从而使常规方法难以去除的杂质与未提纯的产品分离。
One of the key challenges to the industrialization of single-wall carbon nanotubes (SWCNTs) is the commercial-scale production of highly purified SWCNTs separated into metallic and semiconducting species. In the present study, the purification of SWCNTs, i.e., the removal of amorphous carbon or bundled SWCNTs, was performed by quantifying and controlling their adsorbability onto agarose gel. The quantification of the adsorbability was achieved by assuming the Langmuir isotherm, and control over the adsorbability was exerted using 0.05–1% sodium deoxycholate (DOC). The results show that the adsorbability depends on the concentration of DOC. At a low DOC concentration (approximately 0.05%), impurities such as amorphous carbon or bundled SWCNTs were preferentially adsorbed onto the gels, whereas, at an intermediate DOC concentration (ca. 0.25%), high-purity SWCNTs were mainly adsorbed onto the gels. Thus, the impurities, which are difficult to remove by conventional methods, could be separated from unpurifie...