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., e

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

Example Embodiment

[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-necked bottle, add 5g MoO 3 And 35mL 30% H 2 O 2 The aqueous solution was stirred at 40°C for 4 hours, cooled to room temperature, and filtered with suction to obtain a yellow filtrate. Add 5.0 mL of hexamethylphosphoric triamide (HMPA) in an ice bath; filter with suction under reduced pressure; 3.0g MoO 5 ·H 2 O·HMPA product, the yield was 29%.

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

[0040] Weigh 10g ethyl 4-aminobenzoate, 2.4g MoO 5 ·H 2 O·HMPA is dissolved in 100mL dichloromethane, and then 40mL 30% H 2 O 2 The aqueous solution was stirred and reacted at 30°C for 20 hours. After the reaction is completed, wash with water, extract the reaction solution with 200 mL of dichloromethane, combine the or...

Example Embodiment

[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, except that in step 2, β-cyclodextrin is used instead of α-cyclodextrin. The solubility of carbon nanotubes is shown in Table 1.

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

[0049]

Example Embodiment

[0050] Example 3. Using light to control the solubility of multi-walled carbon nanotubes

[0051] The preparation concentration is 1×10 -4 Add 10 mL of mol / L sodium azobenzoate aqueous solution, add an equimolar amount of cyclodextrin, and ultrasound for 5 minutes to form an aqueous solution of supramolecular complex. 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. Ultrasound at 20°C for 5h, and then divide the solution evenly into A and B parts. The A solution was irradiated with a 325nm laser for 45 minutes, the B solution was allowed to stand for 45 minutes in the dark, and then the A solution and the B solution were centrifuged at the same time for 30 minutes (8000 rpm).

[0052] Table 2 lists the effects of light on the solubility of carbon nanotubes in the absence of cyclodextrin and in the presence of α- or β-cyclodextrin. It can be seen from the table that light will reduce...

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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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