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Preparation for nano-boehmite with diverse morphologies

A nano boehmite and boehmite technology, applied in the direction of alumina/aluminum hydroxide, can solve problems such as harsh operating conditions, and achieve the effects of easy operation, reduced production costs, and improved production efficiency

Inactive Publication Date: 2008-10-08
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: "Advanced Materials" (Advanced Materials, 2007, 19, 102) used atomic deposition to prepare hollow spheres; East China Institute of Technology Li et al. (Ind. Eng. Chem. Res. 2007, 46, 8004) used high-speed flame spraying A hollow sphere with a shell thickness of about 30nm was produced; Pan et al. (Ceramics International, 2007, 33, 305) from Shanghai Institute of Ceramics, Chinese Academy of Sciences prepared Al / AlOOH core-shell nanoparticles by reacting aluminum foil with sulfuric acid; Claus Feldmann et al. (Nano letter, 2007, 7, 3489) prepared AlOOH hollow spheres with a diameter of about 30nm by using the microemulsion method; but these methods either require high temperature, expensive and complicated equipment, or use a lot of organic solvents, and the operating conditions are generally relatively harsh

Method used

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  • Preparation for nano-boehmite with diverse morphologies
  • Preparation for nano-boehmite with diverse morphologies
  • Preparation for nano-boehmite with diverse morphologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment one: concrete steps are as follows:

[0044] a. Dissolve 3mmol aluminum nitrate in 20ml deionized water to form a uniformly mixed solution;

[0045] b. Under stirring, add 20ml of absolute ethanol and mix well;

[0046] c. Under stirring at room temperature, add 1 mmol of sodium citrate to the above solution, and continue stirring for 50 minutes to form a uniformly mixed solution;

[0047] d. Transfer the uniformly mixed solution to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven at 220° C. for 48 hours. After the reaction, centrifuge and wash several times with deionized water and absolute ethanol.

[0048] e. Dry the sample obtained in step d at 80° C. for 12 hours to obtain boehmite with a core-shell structure, that is, a sphere-within-sphere structure.

[0049] The product obtained in this example was characterized by a transmission electron microscope (TEM) on the morphology of the product. From figure 1 It can be seen th...

Embodiment 2

[0050] Embodiment two: concrete steps are as follows:

[0051] a. Dissolve 0.5mmol aluminum sulfate in 20ml deionized water to form a uniformly mixed solution;

[0052] b. Under stirring, add 20ml of absolute ethanol and mix well;

[0053] c. Under stirring at room temperature, add 0.5 mmol of sodium citrate to the above solution, and continue stirring for 30 minutes to form a uniformly mixed solution;

[0054] d. Transfer the uniformly mixed solution to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven at 180°C for 6-18 hours. After the reaction, centrifuge and wash several times with deionized water and absolute ethanol.

[0055] e. Dry the sample obtained in step d at 60° C. for 12 hours to obtain boehmite with a solid spherical structure.

[0056] The product obtained in this example is dispersed in absolute ethanol, and the morphology of the product is characterized by a transmission electron microscope (TEM). image 3 Solid spheres of boeh...

Embodiment 3

[0057] Embodiment three: concrete steps are as follows:

[0058] a. Dissolve 2mmol aluminum nitrate in 20ml deionized water to form a uniformly mixed solution;

[0059] b. Under stirring, add 20ml acetone and mix well;

[0060] c. Under stirring at room temperature, add 0.5 mmol of sodium citrate to the above solution, and continue stirring for 30 minutes to form a uniformly mixed solution;

[0061] d. Transfer the uniformly mixed solution to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven at 200°C for 24 hours. After the reaction, centrifuge and wash several times with deionized water and absolute ethanol.

[0062] e. Dry the sample obtained in step d at 60° C. for 12 hours to obtain boehmite with a core-shell structure.

[0063] The product obtained in this example is dispersed in absolute ethanol, and the morphology of the product is characterized by a transmission electron microscope (TEM). Figure 4 It can be clearly seen that the obtaine...

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Abstract

The invention relates to a method for the production of a nanometer boehmite with a plurality of patterns, in particular relates to a method for the production of nanometer boehmite materials such as nano-fibers, core shell inner balls, solid balls and hollow balls, and belongs to the technique field of inorganic nano-material preparation process. The method of the invention is characterized in that: a given amount of soluble aluminum salt is dissolved in water then an organic auxiliary solvent is added thereto, a given amount of pattern control agent is added as well under agitation, then the mixed liquid is put into a hydrothermal kettle for reaction at the temperature of between 160 and 250 DEG C for two to sixty hours, the reaction product is separated and the prepared deposition is washed with deionized water and ethanol, finally, the boehmite materials with specific patterns are obtained by being dried at the temperature of between 60 and 80 DEG C. The pattern control agent is one of citrate, tartrate, oxalate and disodium ethylenediamine tetraacetic acid, and the quantity added thereto is ranging from 0 to 20mmol.

Description

technical field [0001] The invention relates to a preparation method of nano-boehmite with various shapes, in particular to a preparation method of nano-boehmite materials such as nanofibers, core-shell spheres, solid spheres, hollow spheres, etc., belonging to inorganic nanomaterials Preparation technology field. Background technique [0002] Alumina fiber has the advantages of high strength, large modulus, small thermal conductivity, low thermal expansion coefficient, good heat and high temperature resistance, and high surface activity. It can form composite materials with superior performance with resin, metal, and ceramics, and is widely used In aerospace, military and other high-tech fields. [0003] The alumina core-shell structure and the hollow part of the hollow sphere can accommodate a large number of guest molecules or large-size guests, resulting in some exotic properties based on microscopic "encapsulation" and "wrapping" effects. These nanoscale or mesoscale h...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 张良苗冯永利纪晓波吕勇陆文聪倪纪朋尚兴付
Owner SHANGHAI UNIV
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