琼脂糖性质对凝胶电泳法分离金属性和半导体性单壁碳纳米管的影响

利用琼脂糖凝胶电泳分离单壁碳纳米管(SWCNTs)技术, 考察了MB, Agarose, Agarose B和LRU 4种琼脂糖对SWCNTs分离效率的影响. 紫外-可见-近红外(UV-Vis-NIR)吸收光谱研究结果表明, 不同的琼脂糖对SWCNTs中s-SWCNTs的分离效率影响较小, 而对m-SWCNTs的分离效率影响较大. 分析4种琼脂糖凝胶的凝胶强度和凝胶网孔尺寸等发现, 影响SWCNTs中m-SWCNTs分离效率的主要因素是琼脂糖的凝胶强度和琼脂糖凝胶形成的网孔尺寸, 小的凝胶网孔尺寸有利于m-SWCNTs富集, 高凝胶强度则不利于其富集.

Effect of Agarose Properties on the Separation of m-SWCNTs and s-SWCNTs by the AGE

The agarose gel electrophoresis(AGE) is one of the low-cost, large-scale technologies for the separation of metallic single-walled carbon nanotubes(m-SWCNTs) and semiconducting single-walled carbon nanotubes(s-SWCNTs). In this paper, AGE technique was used to investigate the influence of the properties of MB, Agarose, Agarose B and LRU on the separating efficiency of SWCNTs. By characterizing their UV-Vis-NIR absorption spectra, we found that different agarose had little influence on the separating efficiency of s-SWCNTs, and had a great effect on the separating efficiency of m-SWCNTs. Furthermore, by comparing the properties of differents agarose gel including gel strength, mesh size and so on, we consider that the major factors in separating efficiency of m-SWCNTs are the gel strength and gel mesh size. The results indicate that the smaller mesh size of the gel is favorable to the enrichment of m-SWCNTs, while the higher gel strength is unfavorable.