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Soluble carbon nanometer pipe absocped with polyelectrolyte on surface and its preparation method

A carbon nanotube and polyelectrolyte technology, applied in nanostructure manufacturing, nanotechnology, nanotechnology and other directions, can solve the problems of inability to large-scale production, many steps, cumbersome preparation, etc., to improve processability, easy operation, wide The effect of the application foreground

Inactive Publication Date: 2007-07-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent (200310121619.X) of Kong Hao et al. and the superb literature (J.AM.CHEM.SOC, 2004, 126, 412-413) disclose the use of ATRP technology to modify the surface of carbon tubes, grafting high polymer The method for preparing water-soluble carbon tubes from substances has many steps, the preparation is relatively cumbersome, and there is a defect that it cannot be mass-produced. Therefore, it is necessary to provide a new technology to overcome the above-mentioned defects in the prior art.

Method used

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  • Soluble carbon nanometer pipe absocped with polyelectrolyte on surface and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In the following examples, the carbon nanotubes are prepared by the method disclosed in the literature (Appl. Phys. Lett., 1995, 67(17), 2477-2479.).

[0029] Step (1): Add 200ml of fuming sulfuric acid (20%, weight) and 2g of carbon nanotube raw materials in a 500ml Erlenmeyer flask, use 40kHz ultrasonic treatment for 18hr, filter with 0.22μm organic microporous membrane, use deionized Repeated washing with water several times to neutrality, and vacuum drying at 90°C for 24 hours to obtain acidified carbon nanotubes;

[0030] Step (2): Take 0.5g of the acidified carbon nanotubes obtained in step (1), put them into an 800ml beaker, add 250ml of deionized water, and after 40kHz ultrasonic treatment for 0.5hr, add 250ml of 2mg / ml polydiallyldimethyl Ammonium chloride (PDDA) sodium chloride aqueous solution, wherein the concentration of sodium chloride is 1mg / ml, after the mixed solution is treated in 40kHz ultrasonic wave for 15min, it is suction filtered with a 0.22μm ...

Embodiment 2

[0036] Adopt the same method of embodiment 1, wherein:

[0037]Acid is the sulfuric acid that weight concentration is 98%;

[0038] The cationic polyelectrolyte is protamine, the anionic polyelectrolyte is a mixture of dextran and sodium polystyrene sulfonate (1:1, mass ratio), and the salt is CaCl 2 ;

[0039] The concentrations of the various substances are:

[0040] Protamine (PRM) 1mg / ml; Dextran (DXS) 0.5mg / ml; Polystyrene Sodium Sulfonate (PSS) 0.5mg / ml; CaCl 2 0.5mg / ml.

[0041] The water dispersion test is also used for detection, and its water solubility is as follows: the carbon nanotubes adsorbed with multilayer polyelectrolytes are kept for more than 5 days without sedimentation.

[0042] The test results show that the water solubility of the carbon nanotubes is greatly improved, thereby improving the processability of the carbon nanotubes, and can be used as an added component of a water-soluble organic matrix.

Embodiment 3

[0044] Adopt the same method of embodiment 1, wherein:

[0045] Acid is the mixed acid (1:3, volume ratio) that the sulfuric acid of 98% and the concentrated nitric acid of 96% are the weight concentration;

[0046] The cationic polyelectrolyte is polyallyl ammonium chloride, the anionic polyelectrolyte is sodium polyacrylate, the salt is KCl,

[0047] The concentrations of the various substances are:

[0048] Polyallyl ammonium chloride (PAH) 1mg / ml; Sodium polyacrylate (PAA) 1mg / ml; KCl 1mg / ml.

[0049] The water dispersion test was also used to detect the water solubility, and its water solubility was as follows: the carbon nanotubes adsorbed with multi-layer polyelectrolytes remained without sedimentation for more than 7 days.

[0050] The test results show that the water solubility of the carbon nanotubes is greatly improved, thereby improving the processability of the carbon nanotubes, and can be used as an added component of a water-soluble organic matrix.

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Abstract

This invention discloses a water-soluble carbon nanometer tube that superficially adsorbs polyelectrolyte and its preparation method. Process nanometer tube, make its surface have active group, display electro-negativity'alternatively adsorb electrolytic which has positive / negative charge by LBL, and make water-soluble carbon nanometer tube of superficial adsorbing single / multilayer polyelectrolyte. This invention is simple to operate, of no pollution; the product show good dissolving dispersibility in water, which can be used as superordinary aquosity additive, and provide excellent machinery, light, electricity, and magnetic function for water-soluble organic giant molecule basal body. And inlet different functional group through polyelectrolyte, make function pattern carbon nanometer tube. Thus, it has extensive application prospect in stuff science and organic medicine field of preparing nanometer ware, transmitter, and super electric capacity.

Description

technical field [0001] The invention relates to a preparation method of a water-soluble carbon nanotube, in particular to a water-soluble carbon nanotube whose surface layer absorbs an electrolyte and a preparation method thereof. Background technique [0002] Carbon nanotube (Cabon Nanotube, referred to as CNT) is a kind of hollow tube formed by graphene sheet formed by carbon atoms, which is divided into single-wall nanotube (Single-wall Nanotube, SWNT) and multi-wall carbon nanotube (Multi-wall Nanotube, MWNT). [0003] Since the world's first carbon nanotube was produced by Iijima of Japan's NEC in 1991, it has received great attention for its unique photoelectric properties, super mechanical properties, and good adsorption properties. However, carbon nanotubes are insoluble and difficult to disperse, which greatly affects their applications. Since 1998, research on fat-soluble carbon nanotubes has been carried out gradually. [0004] Carbon nanotubes have broad appli...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82B3/00
Inventor 李春忠王非王庚超
Owner EAST CHINA UNIV OF SCI & TECH
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