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Separation and recovery method for carbon nanotubes having optical activity and carbon nanotubes having optical activity

A carbon nanotube and optically active technology, which is applied to the separation and recovery of optically active carbon nanotubes and the field of optically active carbon nanotubes, can solve the problems of unresearched CNT optical segregation, and achieve low cost and large-scale processing. Effect

Inactive Publication Date: 2015-11-25
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, in the separation methods of CNTs using gels in these Patent Documents 1 to 5, the separation of metal-type and semiconductor-type CNTs and the separation of semiconductor-type CNTs having a single (n, m) have been successfully performed, but regarding Optical isolation of CNTs has not been studied

Method used

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  • Separation and recovery method for carbon nanotubes having optical activity and carbon nanotubes having optical activity
  • Separation and recovery method for carbon nanotubes having optical activity and carbon nanotubes having optical activity
  • Separation and recovery method for carbon nanotubes having optical activity and carbon nanotubes having optical activity

Examples

Experimental program
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Effect test

Embodiment 1

[0107] In this example, the types of (n, m)CNTs contained in the sample were reduced by pre-separation, and single (n, m) CNTs having optical activity were isolated using this sample.

[0108] [Preparation of CNT dispersion liquid]

[0109] 2% SDS aqueous solution (100 ml) was added to 100 mg of Hipco-CNT (NanoIntegris, CNT synthesized by chemical vapor phase growth method, diameter 1.0±0.3 nm). This solution was cooled in cold water using a tip type ultrasonic breaker (Sonifier, manufactured by Branson Co., Ltd., tip diameter: 0.5 inch) at an output of 30 W / cm 2 Sonication was performed for 9 hours. The resulting dispersion was subjected to ultracentrifugation (289,000×g, 15 minutes) by ultrasonic treatment, and 90% of the supernatant was recovered. This solution was referred to as a CNT dispersion liquid.

[0110] [pre-separation]

[0111] Gel beads (SEPHACRYLS-200HR, GE healthcare) were used as column carriers. The outlet of a plastic syringe with a length of 8 cm and ...

Embodiment 2

[0133] In this example, using the optically inert (6,5) CNT obtained in Col. segregation.

[0134] show the result in Figure 9 . In the figure, the upper layer is before separation, and the lower layer is after separation.

[0135] Depend on Figure 9 It was found that optically active CNTs can be separated by performing the same separation again using optically inactive CNTs.

Embodiment 3

[0137] In this example, by optimizing the dispersion conditions and separation parameters of CNTs, the optical resolution of (5,4) CNTs was performed without performing pre-separation.

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Abstract

The purpose of the present invention is to provide: a method for separating, with good precision, CNT having optical activity with a single (n, m); and optically active carbon nanotubes obtained thereby. A plurality of gel-packed columns are connected in series, an excess amount of carbon nanotube dispersion is passed through the columns, carbon nanotubes having specific optical activity are adsorbed in each column, and carbon nanotubes having optical activity and a specific structure are separated out with precision by elution by respective eluents.

Description

technical field [0001] The present invention relates to a method for efficiently separating optically active carbon nanotubes using a gel and the optically active carbon nanotubes obtained thereby. Background technique [0002] Single-walled carbon nanotubes (CNTs) have excellent properties such as optical properties, electrical properties, and mechanical strength, and are being vigorously researched and developed as excellent new materials. CNTs have a structure in which graphene sheets in which carbon atoms are arranged in a hexagonal shape are rolled without interfaces, and CNTs having different structures can be formed depending on the direction and thickness of the rolling. CNTs are synthesized by various methods such as laser evaporation, arc discharge, and chemical vapor growth (CVD). The present situation is that it can only be obtained in the form of a mixture having a variety of different structures by any synthesis method. CNT has different electrical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J20/28B01J20/34
CPCC01B31/0273B01J20/205B01J20/24B01J20/261B01J20/262B01J20/28047B01J20/285B01J20/29B01J20/291B01J2220/603C01B31/0266C01B2202/20B01D15/08B01J2220/80B82Y30/00B82Y40/00C01B32/172C01B32/174Y10S977/742Y10S977/845
Inventor 刘华平田中丈士片浦弘道
Owner NAT INST OF ADVANCED IND SCI & TECH
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