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Method for preparing monodispersed ultrafine particles

An ultra-fine particle and monodisperse technology, applied in the direction of nanotechnology, can solve the problems of large synthetic particles, poor dispersion, and inability to obtain ultra-fine particles, and achieve the effects of low cost, easy availability of raw materials, and long-term compensation

Inactive Publication Date: 2015-06-10
姜兴茂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the previous preparation technology synthesizes large particles, cannot obtain ultra-fine particles (below 1 micron) and poor dispersion, and provides a new method for preparing monodisperse ultra-fine particles

Method used

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  • Method for preparing monodispersed ultrafine particles
  • Method for preparing monodispersed ultrafine particles
  • Method for preparing monodispersed ultrafine particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh 0.2 g Fe(NO 3 ) 3 (analytical pure) put in a beaker, add distilled water to dilute to 0.5%, mix well to get a solution;

[0036] (2) Put the above solution into the container of the aerosol generator, turn on the microwave oven, and adjust the microwave power to 700 w;

[0037] (3) Open the nitrogen cylinder and adjust the pressure of the aerosol generator to 20 psi. The aerosol particles produced by the aerosol generator enter the microwave oven for microwave irradiation, and the irradiation time is about 26 s;

[0038] (4) The particles after microwave action enter the tube furnace (the temperature is set at 400 ℃) for heat treatment for about 5 s;

[0039] (5) The heat-treated particles are collected on the filter, and the temperature of the filter is maintained at about 80 °C;

[0040] (6) Disperse the collected particles in absolute ethanol solution for SEM and XRD tests. The obtained monodisperse iron oxide particles are as follows: figure 1 , fig...

Embodiment 2

[0043] (1) Weigh 0.2 g AgNO 3 (analytical pure) put in a beaker, add a certain amount of distilled water to dilute to 0.5%, mix well to get a solution;

[0044] (2) Put the above solution into the container of the aerosol generator, turn on the microwave oven, and adjust the microwave power to 700 w;

[0045] (3) Open the nitrogen cylinder and adjust the pressure of the aerosol generator to 15 psi. The aerosol particles produced by the aerosol generator enter the microwave oven for microwave irradiation, and the irradiation time is about 50 s;

[0046] (4) The particles after microwave action enter the tube furnace (the temperature is set at 400 ℃) for heat treatment for about 5 s;

[0047] (5) The heat-treated particles are collected on the filter, and the temperature of the filter is maintained at about 80 °C;

[0048] (6) Disperse the collected particles in absolute ethanol solution for SEM and XRD tests. The obtained monodisperse ultrafine silver particles are as follows...

Embodiment 3

[0051] (1) Weigh 0.2 g AgNO 3 (analytical pure) put in a beaker, add a certain amount of distilled water to dilute to 0.25%, mix well to get a solution;

[0052] (2) Put the above solution into the container of the aerosol generator, turn on the microwave oven, and adjust the microwave power to 800 w;

[0053] (3) Open the nitrogen cylinder and adjust the pressure of the aerosol generator to 40 psi. The aerosol particles produced by the aerosol generator enter the microwave oven for microwave irradiation, and the irradiation time is about 35 s;

[0054] (4) The particles after microwave action enter the tube furnace (the temperature is set at 400 ℃) for heat treatment for about 4 s;

[0055] (5) The heat-treated particles are collected on the filter, and the temperature of the filter is maintained at about 80 °C;

[0056] (6) Disperse the collected particles in absolute ethanol solution for DLS test. The test results are as follows: Figure 5 shown

[0057] It can be seen ...

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Abstract

The invention discloses a method for preparing monodispersed ultrafine particles, and relates to a method for preparing monodispersed metal simple substances or metal oxide ultrafine particles by using microwave irradiation of aerosol droplets. The microwave treatment process is performed for polydispersed aerosol droplets, so that micron-sized aerosol is crushed into submicron-sized or nanometer-sized aerosol so as to obtain the monodispersed ultrafine particles. Monodispersed metal, alloy and metal oxide particles can be obtained by changing the precursor type, the carrier gas type and the microwave power. The prepared ultrathin particles have controllable particle diameters and morphologies and excellent dispersibility; the particle diameters are in a range of 10-1000 nanometers; and the whole process has such advantages as simple operation, environmental protection and lower cost.

Description

technical field [0001] The invention provides a method for preparing monodisperse ultrafine particles. Specifically, the present invention relates to a method for preparing monodisperse metal element or metal oxide ultrafine particles by irradiating aerosol droplets with microwaves. Background technique [0002] Monodisperse particles refer to a population of particles that are uniform in shape and composition and have a very narrow particle size distribution. Highly monodisperse ultrafine particles with uniform morphology, consistent size, and consistent crystal form are the prerequisites for basic and applied research on nanomaterials. The overall performance of monodisperse particles tends to be consistent, which provides convenience for people to study material properties, and is also widely used in many aspects such as instrument parameter calibration and colloid theory verification. Ultrafine monodisperse particles have excellent performance. At present, ultrafine mo...

Claims

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Application Information

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IPC IPC(8): B22F9/30B22F9/08B82Y40/00
Inventor 姜兴茂闵建中黎珊
Owner 姜兴茂
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