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Method of preparing hydroxy apatite liquid crystal in aqueous solution

A technology of hydroxyapatite and aqueous solution, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve problems such as hydroxyapatite liquid crystal reports that have not been seen yet, and achieve excellent biocompatibility, low preparation cost, and easy post-production Effect of treatment

Inactive Publication Date: 2007-02-14
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there have been no reports on hydroxyapatite liquid crystals at home and abroad

Method used

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  • Method of preparing hydroxy apatite liquid crystal in aqueous solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 300ml of calcium nitrate solution with a concentration of 0.05M into the gelatin solution with a concentration of 0.03g / ml, stir vigorously and heat up to 85°C;

[0020] (2) After 20min, add dropwise the ammonium phosphate solution with a concentration of 0.025M and a volume of 300ml at a rate of 50ml / h;

[0021] (3) Then slowly increase the temperature. When the temperature rises to 100°C, keep the constant temperature for 2 hours and continue to stir. After the reaction is over, let it cool naturally. After the reaction system drops to room temperature, use 2000r / m. Centrifuge for 2 hours, separate the sediment from the sol, and concentrate the sol in vacuum at less than 80°C for 2 hours;

[0022] (4) Under the condition of ultrasonic oscillation, sols with mass volume ratios of 1%, 7%, and 15% were prepared respectively, and left to stand for 10 days, and the liquid crystal phase transition in the sol was observed.

[0023] A hydroxyapatite nematic liquid cr...

Embodiment 2

[0025] (1) Add 100ml of calcium nitrate solution with a concentration of 0.15M into the gelatin solution with a concentration of 0.01g / ml, stir vigorously and heat up to 95°C,

[0026] (2) After 30min, add dropwise the concentration of 0.075M with the speed of 40ml / h, and the volume is 100ml of disodium hydrogen phosphate solution,

[0027] (3) Then slowly increase the temperature. When the temperature rises to 100°C, keep the constant temperature for 3 hours and continue to stir. After the reaction is over, let it cool naturally. After the reaction system drops to room temperature, use the speed of 3000r / m. Centrifuge for 1 h, separate the sediment from the sol, and concentrate the sol in vacuum at less than 80°C for 2 h;

[0028] (4) Under the condition of ultrasonic oscillation, sols with mass volume ratios of 1%, 7%, and 15% were prepared respectively, and left to stand for 10 days, and the liquid crystal phase transition in the sol was observed.

[0029] A hydroxyapatite...

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Abstract

The invention relates to a method for preparing hydroxyl apatite liquid crystals in water solution and the product thereof. And the method comprises the steps of: (1) adding soluble calcium salt solution in biological protein solution, strongly blending and raising temperature; (2) dropping soluble phosphate solution; (3) raising temperature and continuing blending, naturally cooling, separating fallout from sol and concentrating the sol; and (4) observing phase change of liquid crystals in sols of different concentrations. And the hydroxyl apatite in the prepared liquid crystal comprises oriented rodlike particles. And the product has special photo, electric and magnetic effects and high thermal stability different from those of organic liquid crystals, especially applied to display devices having low response rates and used on extreme conditions so as to enlarge application range of organic liquid crystals. And the organic / inorganic bone replacement materials prepared by high dispersivity and oriented arrangement of hydroxyl apatite particles more approach to characteristics of human bones, brining benefit to the great majority of bone damage sufferers.

Description

(1) Technical field: [0001] The invention belongs to the preparation technology of inorganic lyotropic liquid crystals, in particular to a method for forming a sol in an aqueous solution through surface modification of rod-shaped hydroxyapatite, and changing the concentration of the sol to obtain a hydroxyapatite liquid crystal. (two) background technology: [0002] Since the German botanist discovered the liquid crystal phase transition of cholesterol benzoate in 1888, the liquid crystal has the dual properties of liquid and crystal, especially its remarkable optical anisotropy, and its internal molecular arrangement state is easy to change with the external magnetic field. , Electric field, surface force and mechanical force change characteristics, making liquid crystal an excellent display material. However, so far most liquid crystals are organic. Because inorganic minerals have a high melting point, they cannot be melted to form thermotropic liquid crystals like organi...

Claims

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Application Information

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IPC IPC(8): C09K19/06
Inventor 陈民芳谭军军刘德宝由臣王玉红
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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