Method for separating single chiral carbon nanotube mirror bodies

By using a composite system composed of cholic acid and traditional surfactants, combined with stepwise elution technology of gel chromatography, the problem of separating small-diameter single chiral carbon nanotubes into mirror images in existing technologies has been solved, achieving efficient separation and preparation, and promoting their application in optoelectronic devices and biomolecular probes.

CN117486205BActive Publication Date: 2025-11-28INSTITUTE OF PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202311525243.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-16
Publication Date
2025-11-28
Estimated Expiration
2043-11-16

AI Technical Summary

Technical Problem

Existing technologies struggle to efficiently separate and prepare mirror images of single chiral carbon nanotubes with diameters smaller than 0.69 nanometers. In particular, the low separation yield and purity of small-diameter carbon nanotubes limit their application in fields such as optoelectronic devices and biomolecular fluorescent probes.

Method used

A novel surfactant separation system is employed, utilizing a composite system of cholic acid and traditional surfactants. Stepwise elution is performed via gel chromatography to enhance the selective adsorption and separation of small-diameter carbon nanotubes in the gel. The specific steps include dispersing carbon nanotubes into a composite surfactant solution, using cholic acid to regulate the density difference of the surfactants, and combining the eluent for selective stepwise elution.

Benefits of technology

This study achieved efficient separation and preparation of single chiral carbon nanotube mirror images with a diameter of less than 0.69 nanometers, improving the purity and yield of the separation, breaking through the bottleneck of traditional separation technology, and promoting the application of carbon nanotubes in optoelectronic devices and biomolecular probes.

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Abstract

The present application provides a method for separating single chiral carbon nanotube mirror bodies, comprising the following steps: (1) dispersing carbon nanotube raw materials into a solution of a composite surfactant to obtain a carbon nanotube dispersion liquid; (2) using gel chromatography for stepwise elution to separate the carbon nanotube dispersion liquid, and collecting the separation product to obtain single chiral carbon nanotube mirror bodies; wherein the solution of the composite surfactant comprises cholic acid, a first surfactant and an optional second surfactant, and a solvent; the first surfactant is selected from one or more of sodium octyl sulfate, sodium decyl sulfate, sodium dodecyl sulfate and sodium n-hexadecyl sulfate; the second surfactant is selected from one or more of sodium cholate, sodium hydrate cholate, sodium dehydrocholate, sodium deoxycholate, sodium lithocholate, sodium hyodeoxycholate and sodium chenodeoxycholate. The method of the present application can separate and prepare single chiral carbon nanotube mirror bodies with a diameter of less than 0.69 nanometers.
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