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Green continuous pure-phase Fe5C2 nanoparticle preparation method

A nanoparticle and iron carbide technology, applied in chemical instruments and methods, carbon compounds, nanotechnology, etc., can solve problems such as environmental threats and expensive raw materials, and achieve continuity, simple process, and important practical value Effect

Inactive Publication Date: 2018-12-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] above in Fe 5 C 2 Significant explorations and researches have been made on the nanoparticle synthesis process, but the raw materials obtained are expensive and often pose a great threat to the environment

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0054] Ferrous sulfate is formulated into a 1mol / L solution; 2mol / L sodium borohydride solution is added to the ferrous sulfate solution to produce a black precipitate; then the black precipitate is transferred to the oleylamine solution with a magnetic field, and the molar amount of oleylamine is iron 10 times that of the source; the temperature of oleylamine is 260°C, and after 10 minutes of reaction, the black precipitate is transferred to the receiver by a magnetic field, and then dried at 50°C to obtain a pure-phase iron carbide (Fe 5 C 2 ) nanoparticles.

[0055] Such as figure 2 As shown, the obtained intermediate product elemental iron and the final product powder are scanned by X-ray diffractometer between 10 and 80 degrees. For elemental iron, there is no diffraction peak in X-ray diffraction between 10 and 80 degrees. It is proved that the obtained intermediate product is an amorphous elemental iron. For X-ray diffraction of the final product, all diffraction pe...

Embodiment 2

[0057] Ferric sulfate is formulated into a 1mol / L solution; 3mol / L sodium borohydride solution is added to the ferric sulfate solution to produce a black precipitate; then the black precipitate is transferred to the cetylamine solution with a magnetic field, and the molar amount of cetylamine is iron 20 times that of the source; the temperature of hexadecylamine is 270°C, and after 30 minutes of reaction, the black precipitate is transferred to the receiver by a magnetic field, and then dried at 120°C to obtain pure phase iron carbide (Fe 5 C 2 ) nanoparticles.

[0058] image 3 Give all the diffraction peaks and Fe of the obtained powder using the X-ray diffraction pattern 5 C 2 The standard card (PDF: 03-065-6169) is completely consistent without any miscellaneous peaks, which proves that the obtained powder is Fe 5 C 2 pure phase. Among them, the standard card (PDF: 03-065-6169) has a monoclinic phase structure, and its structure is determined to be monoclinic C2 / c. ...

Embodiment 3

[0060] Ferric nitrate is mixed with 1mol / L solution; 3mol / L sodium borohydride solution is added in ferrous nitrate solution, produces black precipitate; Then black precipitate is transferred in the octadecylamine solution with magnetic field, and the molar weight of octadecylamine is 40 times that of the iron source; the temperature of octadecylamine is 300°C, and after 60 minutes of reaction, the black precipitate is transferred to the receiver by a magnetic field, and then dried at 200°C to obtain pure phase iron carbide (Fe 5 C 2 ) nanoparticles.

[0061] Figure 4 Given the transmission electron diffraction pattern of the obtained powder, it can be seen from the figure that Fe 5 C 2 The nanoparticles are basically in the shape of regular spheres. Each ball is formed by agglomerating small balls with very small particles. The particle size of the nanospheres is about less than 20 nanometers, which is basically consistent with the grain size obtained by calculating the h...

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Abstract

The invention discloses a green continuous pure-phase Fe5C2 nanoparticle preparation method, which comprises the following steps: preparing an aqueous solution from low-cost ferrite; then adding a reductive aqueous solution to generate black amorphous zero-valent iron precipitates; transferring the black precipitates into an organic high-boiling-point amine solution by use of an external magneticfield; performing reaction for a certain time, transferring the black precipitates into a receiver by use of the external magnetic field, and performing drying to obtain the pure-phase Fe5C2 nanoparticles. According to the method, a new solution and process flow are provided for environment-friendly industrial production of a Fe5C2 nanometer material; the method is simple and easy in process, highin repeatability and suitable for industrial continuous production; the whole reaction system is free of environmental pollution, and an environment-friendly nanopowder synthesis process is implemented; the method is high in practicability, and also has relatively broad application prospect and relatively good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of preparation and research of inorganic binary iron carbide nanoparticle powder, and specifically relates to a green continuous preparation of pure-phase iron carbide ( carbide, Fe 5 C 2 ) Nanoparticle method and application thereof. Background technique [0002] Iron-carbon alloys have made very important contributions to the development of human civilization. Since ancient times, humans have discovered that carburizing pure iron can obtain higher hardness and better flexibility. Therefore, it has been handed down as an important process in the preparation of various swords and other cold weapons. The essence of carbonizing ironware is to produce a layer of iron-carbon alloy on its surface. Iron-carbon alloy not only has superior mechanical properties, but also has certain magnetic properties. Among all iron-carbon compounds, currently known chemical composition compounds include Fe 3 C,Fe 2 C,Fe ...

Claims

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Application Information

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IPC IPC(8): C01B32/914B82Y40/00
CPCB82Y40/00C01B32/914C01P2002/72C01P2004/03C01P2004/04C01P2004/64C01P2006/42
Inventor 葛万银高文兴
Owner SHAANXI UNIV OF SCI & TECH
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