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Method for solubilizing carbon nano tube by using super-molecular complex and controlling solubility thereof by using light

A technology of supramolecular composites and carbon nanotubes, which is applied in the direction of non-effective components of polymer compounds, chemical instruments and methods, medical preparations of non-effective components, etc., to achieve the effects of increasing application prospects, simple operation, and reducing cytotoxicity

Inactive Publication Date: 2010-12-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There have been some reports on modifying carbon nanotubes by covalent bonds and making their solubility change with changes in the external environment (Yu, B., et al Chem.Commun.2006, 2356; Hong, C.T., et al J.Mater.Chem .2008, 18, 1831), but the use of non-covalent methods to modify carbon nanotubes and make them respond to changes in the external environment has not yet seen relevant reports or patents.

Method used

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  • Method for solubilizing carbon nano tube by using super-molecular complex and controlling solubility thereof by using light
  • Method for solubilizing carbon nano tube by using super-molecular complex and controlling solubility thereof by using light
  • Method for solubilizing carbon nano tube by using super-molecular complex and controlling solubility thereof by using light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1. The supramolecular complex formed by sodium azobenzoate and α-cyclodextrin solubilizes multi-walled carbon nanotubes

[0035]Step 1: Preparation of Sodium Azobenzoate

[0036]

[0037] (1) Catalyst MoO 5 ·H 2 Preparation of O·HMPA

[0038] In a 100mL three-neck flask, add 5g MoO 3 and 35 mL of 30% H 2 o 2 Aqueous solution, stirred at 40°C for 4 hours, lowered to room temperature, filtered with suction to obtain a yellow filtrate, added 5.0 mL of hexamethylphosphoric triamide (HMPA) in an ice bath; filtered with suction under reduced pressure; recrystallized with methanol to obtain 3.0 g MoO 5 ·H 2 O.HMPA product in 29% yield.

[0039] (2) Preparation of ethyl p-nitrosobenzoate

[0040] Weigh 10g ethyl 4-aminobenzoate, 2.4g MoO 5 ·H 2 O·HMPA was dissolved in 100mL of dichloromethane, and then 40mL of 30% H 2 o 2 aqueous solution, stirred and reacted at 30°C for 20 hours. After the reaction, wash with water, extract the reaction solution with 2...

Embodiment 2

[0046] Example 2, the supramolecular complex formed by sodium azobenzoate and β-cyclodextrin solubilizes multi-walled carbon nanotubes

[0047] The steps are the same as in Example 1, the only difference is that in step 2, β-cyclodextrin is used instead of α-cyclodextrin, and the solubility of carbon nanotubes is shown in Table 1.

[0048] Table 1. Solubility of carbon nanotubes in aqueous solutions of different concentrations of sodium azobenzoate and supramolecular complexes formed with α- and β-cyclodextrin

[0049]

Embodiment 3

[0050] Embodiment 3, using light to control the solubility of multi-walled carbon nanotubes

[0051] The preparation concentration is 1×10 -4 Add an equimolar amount of cyclodextrin to 10 mL of a mol / L sodium azobenzoate aqueous solution, and sonicate for 5 minutes to form a supramolecular complex aqueous solution. Weigh 3 mg of multi-walled carbon nanotubes and place them in a centrifuge tube, then add 10 mL of supramolecular complex aqueous solution, and mix. Sonicate at 20°C for 5 hours, and then divide the solution evenly into two parts, A and B. The solution A was irradiated with a 325nm laser for 45 minutes, the solution B was allowed to stand in the dark for 45 minutes, and then the solutions A and B were simultaneously centrifuged for 30 minutes (8000 rpm).

[0052] Table 2 lists the influence of light on the solubility of carbon nanotubes in the presence of no cyclodextrin and the presence of α- or β-cyclodextrin. It can be seen from the table that light will reduc...

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Abstract

The invention provides a method for increasing solubility of a carbon nano tube in water and capable of controlling the solubility through light. Cyclodextrin and azobenzene compound can form an inclusion super-molecular complex, the naked benzene ring part in the azobenzene compound can be adsorbed on the surface of the carbon nano tube by Vanderwals force and phi-phi interaction, and the hydrophilic property of the cyclodextrin assists the dissolution of the carbon nano tube in the water so as to form a uniform and stable system. When the system is irradiated by the light of a certain wavelength, the azobenzene compound produces trans-isomerization reaction so as to cause the dissociation of the super-molecular complex and change the solubility of the carbon nano tube. The method increases the solubility of the carbon nano tube in the water, and can control the change of the solubility of the carbon nano tube through the light and enlarge the application range of the carbon nano tube on the aspects of medicament carriers, biosensors and the like.

Description

technical field [0001] The invention relates to modifying carbon nanotubes with non-covalent bonds, in particular to a method for solubilizing carbon nanotubes by supramolecular complexes and controlling their solubility by light, and belongs to the technical field of organic and inorganic materials. Background technique [0002] Carbon nanotubes have unique physical, chemical and electrical properties, such as anisotropy, high mechanical strength and elasticity, and good thermal and electrical conductivity, making them widely used in nanoelectronic devices, super composite materials, catalysts, drug carriers, and biosensors. Great breakthroughs have been made in many fields such as hydrogen storage materials (Xie, L. et al J.Am.Chem.Soc., 2007, 129, 12382; Chen, J., et al J.Am.Chem.Soc. ., 2008, 130, 16778). Because of the van der Waals force and π-π interaction between the tube walls, carbon nanotubes often form nanotube bundles, resulting in extremely low solubility in w...

Claims

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Application Information

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IPC IPC(8): A61K47/40A61K47/16A61K47/04B01J32/00B01J31/06G01N33/48
Inventor 李嫕郝晓春韩永滨于天君陈金平曾毅李迎迎
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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