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Method for preparing organophilic solvent carbon nanotube microcapsule

A technology of carbon nanotubes and multi-walled carbon nanotubes, which is applied in the field of carbon nanotubes, can solve the problems of large amount of solvent and damage to the surface structure of carbon nanotubes, and achieve the effects of convenient transportation, no pollution to the environment, and convenient use

Inactive Publication Date: 2011-09-28
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these treatment methods have good dispersion effects, they can only disperse carbon nanotubes in a system with water as the medium.
There is also a method of surface wetting treatment of carbon nanotubes with a mixture of strong alkali and ethanol. Although it can be dissolved in organic solvents, the current research on this method is only for relatively expensive single-walled carbon nanotubes (SWNT) , and the amount of solvent required for processing is large, and this processing method will destroy the surface structure of carbon nanotubes

Method used

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  • Method for preparing organophilic solvent carbon nanotube microcapsule

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 0.1 g of multi-walled carbon nanotubes was added to 100 mL of N,N-dimethylformamide (DMF) solution of phthalylated chitosan (PhthCS) prepared at a concentration of 15%. The prepared suspension was put into an ultrasonic reactor, and subjected to ultrasonic treatment for 15 min; the ultrasonic-treated suspension was centrifuged at a centrifugation rate of 1500 r / min, and the lower precipitated part was collected. Dry the precipitated part in a vacuum oven at 80° C. for 48 hours to obtain redispersible carbon nanotube microcapsules. The obtained carbon nanotube microcapsules were added into dimethyl sulfoxide (DMSO) and ultrasonically treated for 10 minutes to disperse uniformly. According to the settling time test, the suspension of carbon nanotube microcapsules was still stable after being placed for 1000 hours, and no settling occurred. See Table 1 for the settling time of the chitosan-treated carbon nanotube microcapsules dispersed in an organic solvent.

[0025] Ta...

Embodiment 2

[0028] Add 0.2g concentrated sulfuric acid acidification surface treatment multi-walled carbon nanotubes into the prepared N,N-dimethylacetamide (DMAC) solution of 100mL benzoylated chitosan (BCS) with a concentration of 20% . The prepared suspension was put into an ultrasonic reactor and subjected to ultrasonic treatment for 10 min; the ultrasonic-treated suspension was centrifuged at a centrifugation rate of 2500 r / min, and the lower precipitated part was collected. Dry the precipitated part in a vacuum oven at 100° C. for 30 hours to obtain redispersible carbon nanotube microcapsules. The obtained carbon nanotube microcapsules were added into acetonitrile, and then ultrasonically treated for 10 minutes to disperse uniformly. See Table 1 for the settling time of the chitosan-treated carbon nanotube microcapsules dispersed in an organic solvent.

Embodiment 3

[0030] Add 1.2g nitric acid mixed acid (nitric acid:sulfuric acid ratio 3:1) to acidify the surface-treated multi-walled carbon nanotubes into 100mL of phthalylated chitosan (PhthCS) with a concentration of 20%. in sulfoxide (DMSO) solution. The prepared suspension was put into an ultrasonic reactor, and ultrasonically treated for 60 min; the ultrasonically treated suspension was centrifuged at a centrifugation rate of 5000 r / min, and the lower precipitated part was collected. Dry the precipitated part in a vacuum oven at 110° C. for 24 hours to obtain redispersible carbon nanotube microcapsules. Add the obtained carbon nanotube microcapsules into N, N-dimethylformamide (DMF), and ultrasonically treat for 10 minutes to disperse uniformly. The settling time test results are shown in Table 1.

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Abstract

The invention provides a preparation method used for carbon nano-tube microcapsules affinitive to organic solvent, relating to a preparation method used for the carbon nano-tube which can be dispersed in the organic solvent. A preparation method used for carbon nano-tube microcapsules affinitive to organic solvent is provided. According to the mass volume ratio of 0.1-12mg / ml, the carbon nano-tube is added into a chitosan derivative solution with the consistency of 1-20 percent to gain suspension liquid; the suspension liquid is disposed by ultrasonic; the suspension liquid disposed by the ultrasonic is centrifuged; subsequently, the sediment at the bottom after the centrifuging is taken, baked and dried to gain the carbon nano-tube microcapsule. The prepared carbon nano-tube microcapsuleis convenient for use, carrying and transportation, is poisonless and harmless, and does not pollute the environment. When necessary, the carbon nano-tube microcapsule can be disposed simply by ultrasonic, thus being uniformly dispersed in the organic solvent.

Description

technical field [0001] The invention relates to a carbon nanotube, in particular to a preparation method of a carbon nanotube which can be dispersed in an organic solvent. Background technique [0002] Carbon nanotubes have been developed for quite a long time since their discovery, and their properties such as high mechanical strength, small size, excellent electromagnetic properties, and similar molecular structure to polymers have attracted widespread attention. However, the characteristics of carbon nanotubes that are easy to agglomerate into bundles or entanglement and difficult to disperse in organic solvents and water seriously restrict the research and application of carbon nanotubes in polymer blending. Therefore, obtaining a uniformly dispersed carbon nanotube suspension is a current research hotspot. [0003] At present, there are mainly two types of methods for efficiently dispersing carbon nanotubes: chemical modification treatment methods and physical dispersi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 董炎明曾海涛周花
Owner XIAMEN UNIV