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Method for cladding Nano carbon tube by using hydroxyapatite

A technology of hydroxyapatite and carbon nanotubes is applied in the preparation of carbon nanotubes, and the field of coating carbon nanotubes with hydroxyapatite can solve the problems of deposition, adverse health, etc., and achieve improved mechanical properties, reduced toxicity, Simple to use effects

Inactive Publication Date: 2007-05-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, previous studies have shown that carbon nanotubes are easy to deposit in the lungs, stomachs, kidneys and bones of animals, which is harmful to health

Method used

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  • Method for cladding Nano carbon tube by using hydroxyapatite
  • Method for cladding Nano carbon tube by using hydroxyapatite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) reflux treatment of multi-walled carbon nanotubes in concentrated nitric acid with a concentration of 70% at 120° C. for 4 hours, then wash with distilled water until neutral, dry, grind, and pass through a 300-mesh sieve for later use;

[0037] 2) taking the anionic surfactant sodium dodecylsulfonate as a dispersant, distilled water as a dispersion medium, and making a 1% sodium dodecylsulfonate solution by mass percentage, the carbon nanotubes prepared in step 1) Add it, ultrasonically disperse for 2 hours, and prepare a suspension with a concentration of 0.6g / L;

[0038] 3) Ca(NO 3 ) 2 with (NH 4 ) 2 HPO 4 Prepare a calcium ion solution with a concentration of 1.2mol / L and a phosphorus ion solution with a concentration of 0.72mol / L;

[0039] 4) Ca(NO) prepared in step 3) 3 ) 2 The solution is slowly added to the suspension described in step 2), the pH value is adjusted to 10 with ammonia water, and then ultrasonically dispersed for 0.5 hours, and then trans...

Embodiment 2

[0043] 1) Treat the multi-walled carbon nanotubes prepared by the catalytic cracking method in sulfuric acid with a concentration of 98.3% at 100° C. for 1 hour, then wash with distilled water until neutral, dry, grind, and pass through a 300-mesh sieve for later use ;

[0044] 2) take anionic surfactant sodium dodecylbenzene sulfonate as dispersant, distilled water is dispersion medium, be made into the sodium dodecylbenzenesulfonate solution that mass percent is 1%, the carbon that step 1) makes Add nanotubes to it, ultrasonically disperse for 3 hours, and prepare a suspension with a concentration of 1g / L;

[0045] 3) Ca(NO 3 ) 2 with (NH 4 ) 2 HPO 4 Prepare a calcium ion solution with a concentration of 1.2mol / L and a phosphorus ion solution with a concentration of 0.72mol / L;

[0046] 4) Ca(NO) prepared in step 3) 3 ) 2 The solution is slowly added to the suspension described in step 2), the pH value is adjusted to 13 with ammonia water, and then ultrasonically disp...

Embodiment 3

[0049] 1) The multi-walled carbon nanotubes prepared by laser evaporation method were dissolved in the mixture of concentrated nitric acid and concentrated sulfuric acid (V 硫酸 / V 硝酸 =3:1), reflux at 140°C for 6 hours, then wash with distilled water until neutral, dry, grind, and pass through a 300-mesh sieve for later use;

[0050] 2) Using the anionic surfactant citric acid as a dispersant and distilled water as a dispersion medium, prepare a citric acid solution with a mass percentage of 2%, add the carbon nanotubes prepared in step 1) to it, ultrasonically disperse for 0.5 hours, and prepare into a suspension with a concentration of 0.3g / L;

[0051] 3) Ca(NO 3 ) 2 with (NH 4 ) 2 HPO 4 Prepare a calcium ion solution with a concentration of 1.2mol / L and a phosphorus ion solution with a concentration of 0.72mol / L;

[0052] 4) Ca(NO) prepared in step 3) 3 ) 2 The solution is slowly added to the suspension described in step 2), the pH value is adjusted to 11 with ammoni...

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Abstract

This invention discloses a method for coating carbon nanotubes (CNTs) with hydroxyapatite. The method comprises: (1) refluxing CNTs in a strongly oxidative acid at 100-140 deg.C, then washing to neutrality, drying, and milling; (2) dispersing oxidized CNTs by ultrasonication with anionic surfactant as the dispersant to obtain 0.2-1 g/L suspension; (3) preparing Ca(NO3)2 solution and (NH4)2HPO4 solution; (4) slowly adding Ca(NO3)2 solution into the suspension, adjusting the pH value to 10-13 with ammonia solution, dispersing by ultrasonication, and transferring into a reactor; (5) slowly adding (NH4)2HPO4 solution into the reactor at a (NH4)2HPO4/ Ca(NO3)2 mol ratio of 3:5, aging at 10-80 deg.C, washing the precipitate and drying to obtain the product. The method is easy to operate and can realize intimate bonding of CNTs and hydroxyapatite.

Description

technical field [0001] The invention relates to a method for preparing surface-modified carbon nanotubes, in particular to a method for coating carbon nanotubes with hydroxyapatite, which belongs to the field of biological materials. Background technique [0002] Carbon nanotubes have unique metal or semiconductor conductivity, extremely strong mechanical strength, toughness, and large specific surface area (120-300m 2 / g), good adsorption capacity, catalytic properties, strong microwave absorption capacity and unique pore structure, can be widely used in various high-tech technical fields, and is a new type of functional material and structural material. [0003] At present, in the field of biomedicine, the application of carbon nanotubes is mainly concentrated in two aspects: one is to use its structural specific surface area, which can carry a large amount of drugs, as a drug carrier; the other is to use its high Young's modulus and Elastic modulus enhanced ceramic and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628A61L27/12A61L27/08A61L27/42
Inventor 孙康宁卢志华刘爱红
Owner SHANDONG UNIV
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