Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method

A technology of dispersion stabilizer and reduction method, which is applied in the direction of nanotechnology, can solve the problems of high equipment requirements, low requirements for experimental equipment, large particle size, etc., and achieve simple preparation process, easy access to raw materials, and high product purity. Effect

Inactive Publication Date: 2013-04-24
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of high-energy ball milling in the mechanical alloying method is beneficial to mass production, but it is easy to introduce impurities, and the particle shape uniformity is poor (such as containing flakes, etc.)
The gas phase condensation method realizes atomic evaporation through heating methods such as electric explosion, laser induction, plasma or electron beam radiation, and condenses and deposits in an inert atmosphere. Pollution, small output, difficult to control particle size, etc.
The liquid-phase chemical method is to decompose the alane precursor by heating or reduce the aluminum salt to realize the synthesis of AlNPs in the solvent system; Synthesis, but the disadvantages are that the product is easy to be oxidized during the preparation process, easy to agglomer

Method used

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  • Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method
  • Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method
  • Method for preparing aluminum nanoparticles coated with dispersion stabilizers by liquid-phase chemical reduction method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] a. Purification of mesitylene: In a separatory funnel, wash commercially available mesitylene with concentrated sulfuric acid (generally, 95% to 98% sulfuric acid aqueous solution by mass percentage) until it is colorless and transparent, and then use distilled water, mass percent Wash with 8% NaOH aqueous solution and distilled water until neutral, then wash with CaH 2 Dry, then distill to obtain pure mesitylene, add desiccant-activated 4A molecular sieve (preferably activated 4A molecular sieve treated at 450-600°C for 4-6 hours), put it in a desiccator for standby;

[0033] b. Dispersion of aluminum chloride in mesitylene: take pure mesitylene and aluminum chloride at a mass ratio of pure mesitylene: aluminum chloride of 50 to 200:1, under anhydrous and oxygen-free conditions , add pure mesitylene into a dry (anhydrous) reactor, pump out the air in the reactor, then add aluminum chloride, raise the temperature to 80°C, and disperse the aluminum chloride in the In me...

Embodiment 2

[0039] a. Purification of mesitylene: In a separatory funnel, wash commercially available mesitylene with concentrated sulfuric acid (generally, 95% to 98% sulfuric acid aqueous solution by mass percentage) until it is colorless and transparent, and then use distilled water, mass percent Wash with 10% NaOH aqueous solution and distilled water until neutral, and then wash with CaH 2 Dry, then distill to obtain pure mesitylene, add desiccant-activated 4A molecular sieve (preferably activated 4A molecular sieve treated at 450-600°C for 4-6 hours), put it in a desiccator for standby;

[0040] b. Dispersion of aluminum chloride in mesitylene: take pure mesitylene and aluminum chloride at a mass ratio of pure mesitylene: aluminum chloride of 50 to 200:1, under anhydrous and oxygen-free conditions , add pure mesitylene into a dry (i.e. anhydrous) reactor, pump out the air in the reactor, then add aluminum chloride, raise the temperature to 85°C, and disperse the aluminum chloride in ...

Embodiment 3

[0046] A method for preparing aluminum nanoparticles coated with a dispersion stabilizer by a liquid-phase chemical reduction method comprises the following steps:

[0047] a. Purification of mesitylene: In a separatory funnel, wash commercially available mesitylene with concentrated sulfuric acid (generally, 95% to 98% sulfuric acid aqueous solution by mass percentage) until it is colorless and transparent, and then use distilled water, mass percent Wash with 5% NaOH aqueous solution and distilled water until neutral, and then wash with CaH 2 Dry, then distill to obtain pure mesitylene, add desiccant-activated 4A molecular sieve (preferably activated 4A molecular sieve treated at 450-600°C for 4-6 hours), put it in a desiccator for standby;

[0048] b. Disperse aluminum chloride in mesitylene: take pure mesitylene and aluminum chloride at a mass ratio of 50 to 200:1 for pure mesitylene: aluminum chloride, under anhydrous and oxygen-free conditions, Add pure mesitylene into a...

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Abstract

The invention discloses a method for preparing aluminum nanoparticles coated with dispersion stabilizers by a liquid-phase chemical reduction method. The method is characterized by including: purifying commercially available mesitylene; dispersing aluminum chloride in the mesitylene; and in the presence of nitrogen, adding polyethylene glycol or polyethylene glycol dimethyl ether serving as the dispersion stabilizer and lithium aluminum hydride in the mesitylene dispersed with the aluminum chloride according to the mass ratio of 1-2.5:0.5-1:0.5-1 among the aluminum chloride, the lithium aluminum hydride and the dispersion stabilizer, stirring for reacting 12-24 hours at the temperature of 164-166 DEG C, cooling, performing centrifugal separation, abandoning supernatant liquid, removing residual mesitylene solvents, washing by low-temperature methyl alcohol, performing ultrasonic washing and centrifugal separation, abandoning supernatant liquid and performing vacuum drying for lower materials so that the aluminum nanoparticles coated with the dispersion stabilizers are obtained. The prepared aluminum nanoparticles coated with the dispersion stabilizers are uniform in size and good in dispersity, have certain activity and are applicable to the fields of rocket propellants, explosives and powders, solar back plates and the like.

Description

technical field [0001] The invention belongs to the preparation of metallic aluminum nanometer materials, and relates to a method for preparing aluminum nanoparticle coated with a dispersion stabilizer by a liquid phase chemical reduction method. The prepared aluminum nanoparticles are suitable for rocket propellants, explosives and solar back panels, as well as other high-tech fields. Background technique [0002] Compared with traditional energetic materials, aluminum nanoparticles (hereinafter referred to as AlNPs) can improve propellant combustion due to their high energy density, low oxygen consumption, high reactivity, and better anti-agglomeration and ignition properties. The advantages of stability, reducing the burning rate and pressure index make it a unique rocket propellant and propellant formula; the smaller the aluminum particles, the lower the melting point, and the easier it is to form a silicon-aluminum composite layer with silicon-based materials at a certa...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
Inventor 刘才林梁晓蕾王绵杨海君任先艳冉卷平王用
Owner SOUTHWEAT UNIV OF SCI & TECH
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