Method for preparing nano material by flame combustion

A technology of nanomaterials and flame combustion, applied in chemical instruments and methods, oxide/hydroxide preparation, inorganic chemistry, etc., can solve the problem of increasing the complexity and uncontrollability of the reaction process, reducing the controllability of the reaction process, Complicated issues

Active Publication Date: 2008-08-06
INST OF CHEM CHINESE ACAD OF SCI
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Problems solved by technology

The disadvantage of the spray pyrolysis method is that a complex set of equipment is required, and due to the limitation of the combustion furnace, the controllability of the reaction process is greatly reduced
In addition, the precursor solution of this method needs to be atomized by gas injection, which also increases the complexity and uncontrollability of the reaction process.
[0007] In short, there is no suitable method for preparing nanomaterials by combustion. Such a method is suitable for the preparation of various inorganic nanomaterials, carbon nanotubes and amorphous nanocarbon materials, and can be continuously produced with simple equipment.

Method used

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  • Method for preparing nano material by flame combustion
  • Method for preparing nano material by flame combustion
  • Method for preparing nano material by flame combustion

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preparation example Construction

[0053] The invention is also suitable for the preparation of water-soluble carbon nanotubes, wherein the length of the obtained carbon tube is 10 nanometers to 10 micrometers. The heads or tubes of the above-mentioned carbon tubes usually contain metal oxide particles, but after treatment with concentrated hydrochloric acid, the metal oxide particles can be removed to obtain carbon nanotubes that can be dispersed in water. The solution formed by dispersing carbon nanotubes in water has excellent colloidal stability, and no carbon tubes will precipitate out within half a year.

[0054] The starting materials used in the present invention are cheap and easy to obtain, the preparation process of nano materials is simple and the nano materials can be produced continuously, the operation is simple, and no complicated equipment is required. The organic solution of the soluble metal compound precursor is directly burned in the air, and Using different soluble metal compound precursors or...

Embodiment 1

[0058] Weigh 0.88 g of iron triacetylacetonate and dissolve it in 50 mL of absolute ethanol. The solution was transferred to an open container, and after ignition, the flame state reached stability within about 1 minute. After the flame state is stable, use a glass sheet with a water film at the tip of the outer flame to collect the powdery substance continuously. When the liquid level drops and the flame position drops, the relative position of the receiving device can be adjusted appropriately so that it is still receiving at the above-mentioned position. After the solution is completely burned, the collected brown-red powder is ultrasonically dispersed with 20 mL of deionized water, and the precipitate is collected by centrifugal separation (4000 revolutions / min), and the precipitate is washed with deionized water 3 Then, finally, the precipitate is mixed with deionized water and ultrasonically dispersed to obtain an aqueous dispersion of the product. X-ray diffraction results ...

Embodiment 2

[0060] Weigh 8.83 g of iron triacetylacetonate and dissolve it in a mixed solvent of 30 mL of methanol and 20 mL of N-vinyl-2-pyrrolidone. Except that the collection time is 5-60 minutes after ignition, the other operations are the same as in Example 1. Γ-Fe obtained 2 O 3 Nanoparticles are ferromagnetic, and their saturation magnetization is 70.4 magnetostatic amperes / g, which is close to the saturation magnetization value of bulk materials; the particle size is 20-300 nanometers.

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Abstract

The invention relates to a direct burning method for preparing high crystallinity metal and oxide nano-particles thereof, metal with carbon shell structure and oxide nano-particles thereof, hollow nano ball of metal oxide, nano-particles with inorganic / inorganic heterogeneous structure and nano carbon pipe of water dispersion. Organic solvent is taken as comburent and carbon providing body; soluble metal compound is taken as metal precursor of nano material; through burning directly the organic solvent of the soluble metal compound precursor in the air, the nano material can be obtained in different positions of flame. The main technical characteristics of the method of the invention are that different kinds and different appearances of nano material can be collected in different positions of the flame; the appearances comprise medicine balls, hollow spheres, polyhedron and one dimensional nano-tube; the structure consists of a catamaran heterogeneous structure and a shell-core structure.

Description

Technical field [0001] The invention relates to a method for preparing nano materials, in particular to a method for preparing nano materials of metal, metal oxide and their complex structures. Background technique [0002] The unique small size effect, surface and interface effects, quantum size effect and macroscopic quantum tunneling effect of nanoparticles make it have many physical and chemical properties that are different from bulk materials. Therefore, nanoparticles have shown great application prospects in the fields of materials chemistry, catalytic chemistry, and biomedicine. [0003] The synthesis methods of nanomaterials can be roughly divided into physical methods and chemical methods. The typical representative of chemical methods is the solution (wet) chemical method; the typical representative of physical methods is the pulverization method. In addition, the use of extreme conditions (such as high temperature, high pressure, high vacuum, etc.) to prepare nanomate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14B22F9/30C01G49/02C01G45/02C01G51/04C01G23/047C01G23/00C01F17/00
Inventor 高明远赵楠
Owner INST OF CHEM CHINESE ACAD OF SCI
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