单壁碳纳米管在胆酸类表面活性剂中的分散及手性碳管(6,5)的双水相分离方法

Dispersion of Single-wall Carbon Nanotubes in Bile Salt Surfactants and Separation of SWCNTs(6,5) by Aqueous Two-phase Extraction

选用牛磺脱氧胆酸钠和脱氧胆酸钠等6种胆酸类表面活性剂,考察其对单壁碳纳米管(SWCNTs)的分散能力.紫外-可见-近红外吸收光谱测试结果表明,在超声功率为225 W,超声时间1 h的分散条件下,胆酸类表面活性剂均能对SWCNTs均匀分散,均可作为SWCNTs的分散剂.在相同条件下,质量分数为2%的牛磺脱氧胆酸钠对SWCNTs的分散能力最强,脱氧胆酸钠对SWCNTs的分散能力最弱.此外,还采用聚乙二醇/葡聚糖双水相系统对SWCNTs分散液进行了萃取分离,获得了纯度较高的手性SWCNTs(6,5).所筛选的SWCNTs分散剂及采用的双水相分离方法为单一手性SWCNTs的分离提供了一定的技术参考.

Single-wall carbon nanotubes（SWCNTs） have sparked great interests because of their outstanding mechanical, electrical and chemical properties. The dispersion of SWCNTs in solvent is the key of their application. In this article, we investigated the abilities of six types of bile salt surfactants including sodium taurodeoxycholate and sodium deoxycholate to disperse SWCNTs. The results of UV-Vis-NIR absorption spectra show that bile salt surfactants can be used to disperse SWCNTs with a tip sonication at 225 W for 1 h. More SWCNTs can be dispersed in 2% （mass fraction） of sodium taurodeoxycholate solution compared with that in sodium deoxycholate. We also applied an aqueous two-phase solvent system containing polyethyleneglycol/ dextran to separate SWCNTs （6,5）. The dispersants and separation method proposed in this article provide helpful technical support for preparation of single chirality SWCNTs.