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Microwave method for preparing nanometer zinc oxide

A nano-zinc oxide and microwave technology, applied in the direction of zinc oxide/zinc hydroxide, can solve the problems of consumption of organic solvents, increase of product cost, uneven particle size distribution, etc., to shorten the reaction time, inhibit the growth of crystal grains, overcome the The effect of local overburning

Inactive Publication Date: 2007-07-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, people often choose to wash with organic solvents or use special drying techniques (such as supercritical drying, azeotropic distillation drying and freeze drying, etc.) to remove water, which not only consumes a large amount of organic solvents, but also complicates the process, thereby increasing product costs.
In addition, the calcination process adopts the traditional heating method, that is, the general heating method. The heating starts from the outside of the raw material, and it takes a long time to complete the calcination process from the surface to the inside. The nano-zinc oxide obtained in this way has a large particle size and a particle size distribution. Inhomogeneous, unsuitable for ultra-fine materials with special properties
In general, this technical solution has the following disadvantages: complex reaction process, difficult process control, large energy consumption, high cost, uneven particle size distribution of the obtained nanoparticles, etc.

Method used

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  • Microwave method for preparing nanometer zinc oxide
  • Microwave method for preparing nanometer zinc oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 100 grams of basic zinc carbonate, put it into a microwave oven, heat it to 700°C, and keep it warm for 20 minutes to prepare nano-zinc oxide. Accompanying drawing 1 is the X-ray diffraction pattern of preparation product, can find out from figure, each diffraction pattern peak and peak position correspond to JCPDS card 36-1451 (zinc oxide), there is no impurity peak to exist, and explanation product is all oxidation zinc. The resulting zinc oxide had a particle size of 34.5 nm.

Embodiment 2

[0020] Weigh 100 grams of basic zinc carbonate, put it into a microwave oven, heat it to 750°C, and keep it warm for 15 minutes to prepare nano-zinc oxide. Accompanying drawing 2 is the X-ray diffraction pattern of preparation product, can find out from figure, each diffraction pattern peak and peak position correspond to JCPDS card 36-1451 (zinc oxide), there is no impurity peak to exist, and explanation product is all oxidized zinc. The resulting zinc oxide had a particle size of 41.4 nm.

Embodiment 3

[0022] Weigh 100 grams of basic zinc carbonate, put it into a microwave oven and heat it to 800°C, and keep it warm for 10 minutes to prepare nano-zinc oxide. Accompanying drawing 3 is the X-ray diffraction pattern of preparation product, as can be seen from Fig. 3, each diffraction pattern peak and peak position correspond to JCPDS card 36-1451 (zinc oxide), there is no impurity peak to exist, and explanation product is all oxidation zinc. The resulting zinc oxide had a particle size of 51.7 nm.

[0023] The zinc oxide obtained in the above three examples was analyzed by X-ray diffraction method for phase and grain size. The analysis results are shown in Table 1. The results show that the particle size distribution of the zinc oxide obtained in the present invention is uniform.

[0024] Table 1

[0025] Phase analysis

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Abstract

The invention discloses a making method of nanometer zinc oxide through microwave, which comprises the following steps: (1) adopting zinc subcarbonate as raw material; (2) placing zinc subcarbonate into microwave oven to heat to 700-800 deg. c; insulating 10-20min; obtaining the nanometer zinc oxide with even grain size at 30-60nm.

Description

technical field [0001] The invention relates to the technical field of nano-zinc oxide preparation in the technical field of inorganic materials, in particular to a method for preparing nano-zinc oxide by microwave. Background technique [0002] At present, the main method for preparing nano-zinc oxide is the liquid-phase method, that is, the reaction conditions are controlled to first synthesize the precursors, which are easy-to-decompose zinc salts, in the liquid phase, and then these salts are thermally decomposed to prepare nano-zinc oxide. Since the zinc salt prepared by the liquid phase method needs to go through processes such as separation, filtration, washing and drying, these salts usually contain some water, and these waters tend to make the resulting nano-zinc oxide hard due to capillary action during the salt calcination process. reunion. Therefore, people often choose to wash with organic solvents or use special drying techniques (such as supercritical drying,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 刘平安曾令可
Owner SOUTH CHINA UNIV OF TECH
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