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

doi:10.7503/cjcu20160929

Abstract

Abstract:

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.

Key words: Single-wall carbon nanotubes, Bile salt surfactant, Aqueous two-phase system, Dispersion, Separation

CLC Number:

O652
O648.13

TrendMD:

XU Hongmei, LI Jie, QIAO Yunfan, ZHANG Min, ZHANG Hongyang, WANG Yuerong, HU Ping. Dispersion of Single-wall Carbon Nanotubes in Bile Salt Surfactants and Separation of SWCNTs(6,5) by Aqueous Two-phase Extraction^†[J]. Chem. J. Chinese Universities, 2017, 38(7): 1148.

Figures/Tables 7

Fig.1 Chemical structures of sodium taurodeoxycholate hydrate(A), sodium taurocholate hydrate(B), sodium glycocholate hydrate(C), sodium glycodeoxycholate(D), sodium chenodeoxycholate(E) and sodium deoxycholate(F)

Fig.2 Flowchart for separation of SWCNTs(6,5) by ATP extractionU: upper phase, L: lower phase. SWCNTs(6,5) are harvested in either the upper phase or the lower dependingon the original dispersion.

Fig.3 UV-Vis-NIR absorption spectra and the photos(inset) of 1.0 mg/mL SDC-SWCNTs dispersions at different ultrasonic time of 20 min(a), 40 min(b), 60 min(c) and 90 min(d)

Fig.4 UV-Vis-NIR absorption spectra and the photos(inset) of 1.0 mg/mL SDC-SWCNTs dispersions at different ultrasonic powers of 75 W(a), 150 W(b) and 225 W(c)

Fig.5 UV-Vis-NIR absorption spectra of SWCNTs dispersion in bile salt surfactants of STDH-SWCNTs(A), STH-SWCNTs(B), SGH-SWCNTs(C), SGD-SWCNTs(D), SCD-SWCNTs(E) and SDC-SWCNTs(F)

Fig.6 UV-Vis-NIR absorption spectra of SWCNTs(6,5) separated from SDC-SWCNTs dispersion(A) and fluorescence spectrum of SWCNTs(6,5) separated from SDC-SWCNTs dispersion(B) Insets of (A) are the photos of separation process.

Fig.7 UV-Vis-NIR absorption spectra of (6,5) separated from STDH-SWCNTs dispersion(A) and fluorescence spectrum of (6,5) separated from STDH-SWCNTs dispersion(B) Insets of (A) are the photos of separation process.

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