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Production method of hydroxy apatite crystal whisker

A technology of hydroxyapatite and its production method, which is applied in the fields of chemistry and materials, can solve the problems of difficult control of whisker aspect ratio and low conversion rate of hydroxyapatite products, and achieve excellent performance, convenient operation and high product conversion rate high effect

Inactive Publication Date: 2005-01-19
WUHAN CHEM COLLEGE
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The above four methods all have the defects of low conversion rate of hydroxyapatite product and difficult control of whisker aspect ratio

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The present invention will be further described below in conjunction with embodiment.

[0013] The present invention adopts "two-step temperature control, template induction method" to make hydroxyapatite whiskers, and the steps include:

[0014] a. Formulate the calcium-containing sol and phosphorus-containing sol raw materials according to the original Ca / P molar ratio of 1.5 to 2.1,

[0015] b. Form a mixture of phosphorus-containing sol and composite template, and adjust the pH value to 3-5 with nitric acid,

[0016] c. Add urea, a pH adjuster, into the calcium-containing sol, then slowly drop it into the above-mentioned mixed solution, heat up,

[0017] d. After raising the temperature to the first step temperature of 80-85°C, keep the temperature constant for 1-3 hours to generate CaHPO 4 nuclei,

[0018] e. Continue to keep the temperature for 5-10 hours, CaHPO 4 The crystal nucleus continues to grow, and part of it is transformed into Ca 10 (PO 4 ) 6 (OH)...

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Abstract

In the method, the following measures are adopted. The suitable composite molds are added to be as the guiding agent. The temperature of the reaction system, the concentration of the reactants, PH value of the solution and reaction time are controlled strictly. Using 'mold revulsion method with temperature controlled in two steps' obtain the crystal whisker of hydroxyapatite with controllable length breadth ratio and high conversion of product. The invention possesses the features of simple technique, easy of operation, high conversion. The product can be applied in biological material, composite material, moisture sensitive material, laser material and catalyzer etc.

Description

technical field [0001] The invention relates to the fields of chemistry and materials, in particular to a method for producing hydroxyapatite whiskers. Background technique [0002] At present, there are mainly the following methods for preparing hydroxyapatite whiskers: [0003] Homogeneous precipitation method: through the continuous hydrolysis of urea, the pH value of the system is controlled, and CaCl is used to 2 , Ca(NO 3 ) 2 and Na 2 HPO 4 Add NaOH solution dropwise under the condition of nitrogen gas, and then add monosaccharide or other macromolecules to control the pH value of the system to obtain needle-shaped hydroxyapatite crystals. Solid-state reaction method: At 1000°C, water vapor passes through fibrous β-TCP to prepare fibrous hydroxyapatite. Agar gel growth method: first dissolve the agar gel at the boiling point in Ca(NO 3 ) 2 In the solution, a gel is formed by cooling; then, the pH value is 8.3 to 8.7 (NH 4 ) 2 HPO 4 Covering the gel, through ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/14C30B29/62
Inventor 黄志良刘羽
Owner WUHAN CHEM COLLEGE
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