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A preparation method of rod-shaped hydrated alumina nanocrystals

A technology of hydrated alumina and nano-crystals, which is applied in the direction of alumina/aluminum hydroxide, nanotechnology, etc., can solve the problems of high synthesis cost, uneven particle size distribution, and complicated preparation process of alumina hydrate nano-crystal powder. problems, to achieve the effect of regular crystal form, high crystallinity and uniform particle size

Active Publication Date: 2018-01-16
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the invention patents mentioned above, the method for preparing hydrated alumina nano-microcrystalline powder either has the problems of high synthesis cost and complicated preparation process, or there are defects in the use of organic additives and toxic and harmful organic solvents, or The synthetic particle size distribution is uneven and there is agglomeration

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  • A preparation method of rod-shaped hydrated alumina nanocrystals
  • A preparation method of rod-shaped hydrated alumina nanocrystals
  • A preparation method of rod-shaped hydrated alumina nanocrystals

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Solution preparation: Weigh 29.9 g of ammonium acetate solid and place it in a small beaker, add distilled water, stir with a glass rod to dissolve it completely; then add 0.7 ml of acetic acid, stir evenly, and when the temperature of the solution returns to room temperature, dissolve the solution Pour it into a 100ml volumetric flask, and set the volume to 100ml to obtain the ammonium acetate-acetic acid buffer solution. Water-ethanol mixed solvent system;

[0027] (2) Solvothermal reaction: weigh 3.75 g Al(NO 3 ) 3 9H 2 O is placed in a beaker, and the water-ethanol mixed solvent system prepared above is slowly added to the beaker, and it is completely dissolved under the action of magnetic stirring, and then put into a hydrothermal reaction kettle, at a set temperature of 170 ° C React for 24 h in an electric blast constant temperature drying oven, filter the reacted product, wash repeatedly with ethanol and distilled water, dry and grind into powder to obtai...

Embodiment 2

[0030] (1) Solution preparation: Weigh 7.7 g of ammonium acetate solid into a small beaker, add distilled water, stir with a glass rod to dissolve it completely; then add 6 ml of acetic acid, stir evenly, and wait until the solution temperature returns to room temperature, dissolve the solution Pour into a 100 ml volumetric flask, and set the volume to 100 ml to obtain the ammonium acetate-acetic acid buffer solution, whose pH was measured to be 4.84; respectively take 25 ml of absolute ethanol and 30 ml of ammonium acetate-acetic acid buffer solution and mix evenly. Form a water-ethanol mixed solvent system;

[0031] (2) Solvothermal reaction: weigh 3.75 g Al(NO 3 ) 3 9H 2 O is placed in a beaker, and the water-ethanol mixed solvent system prepared above is slowly added to the beaker, and it is completely dissolved under the action of magnetic stirring, and then put into a hydrothermal reaction kettle, at a set temperature of 170 ° C React for 12 h in an electric blast con...

Embodiment 3

[0034] (1) Solution preparation: the preparation of ammonium acetate-acetic acid buffer solution is the same as in Example 1;

[0035] (2) Solvothermal reaction: weigh 3.75 g Al(NO 3 ) 3 9H 2 O is placed in a beaker, and 55 ml of the ammonium acetate-acetic acid buffer solution prepared above is slowly added to the beaker, stirred evenly by magnetic force and then put into a hydrothermal reaction kettle. React in a drying oven for 12 h, filter the reacted product, wash repeatedly with ethanol and distilled water, dry and grind into powder to obtain the hydrated alumina nanocrystals.

[0036] Prepared hydrated alumina nano crystallites see figure 2 , which are nanorod-shaped, with smooth surface, regular shape and uniform distribution.

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Abstract

A method of preparing rod-like hydrated alumina nanometer microcrystalline is disclosed. The method includes firstly preparing an ammonium acetate-acetic acid buffer solution the pH value of which is 4.8-6.8, fully mixing the ammonium acetate-acetic acid buffer solution with absolute alcohol to form a water-ethanol mixed solvent system, dissolving an aluminum salt to the water-ethanol mixed solvent system to form a uniform clear solution, performing a mixed-solvent solvothermal reaction at 110-200 DEG C for 3-24 h, filtering a reaction product, washing, and drying to obtain rod-like hydrated alumina the average particle size of which is 100 nm or below. The prepared product has advantages of a high degree of crystallization, structured crystal forms, narrow particle size distribution, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of hydrated alumina, in particular to a method for preparing rod-shaped boehmite nanocrystals. Background technique [0002] Alumina hydrate, the molecular formula is γ-AlOOH, is an important inorganic chemical product, which can be used in various fields such as flame retardants, adsorbents, catalysts and carriers, rubber and plastic fillers, etc. Recently, hydrated alumina with nanocrystalline morphology has attracted more and more attention due to its high purity, superior dispersion properties, suitable particle size and unique way of microscopic packing. Alumina hydrate nanocrystals can be used as a functional ink-absorbing material for digital printing to prepare high-gloss photo paper coatings with high ink-absorbing performance, high gloss and good color reproduction. Hydrated alumina nanocrystals also have important uses in the preparation of high-purity alumina powder and sapphire, special ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82Y40/00
CPCC01F7/02C01P2002/72C01P2004/03C01P2004/16C01P2004/52C01P2004/64
Inventor 江琦温俊磊
Owner SOUTH CHINA UNIV OF TECH