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Method for induced-growing Epsilon-ferric oxide nano-rod by lead ions

An iron oxide nano and lead ion technology, applied in iron oxide, iron oxide/iron hydroxide, nanotechnology, etc., can solve the problems of fluctuation of synthesis process stability, weakening of induced growth effect, narrow synthesis temperature range, etc. The effects of practicability and application value, strong synthesis stability, and convenient operation

Active Publication Date: 2017-11-21
YANGZHOU UNIV
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  • Description
  • Claims
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Problems solved by technology

However, the problem is that the crystallization of silicon dioxide during the heat treatment weakens the effect of alkaline earth metal ions on the induced growth of ε-iron oxide, making the control of the nanorod synthesis process extremely sensitive to temperature. Generally, the synthesis temperature range is very narrow. Taking alkaline earth metal barium as an example, the temperature range for the induction of ε-iron oxide nanorods is from 980°C to 1000°C, and there are relatively large fluctuations in the stability of the synthesis process

Method used

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  • Method for induced-growing Epsilon-ferric oxide nano-rod by lead ions
  • Method for induced-growing Epsilon-ferric oxide nano-rod by lead ions
  • Method for induced-growing Epsilon-ferric oxide nano-rod by lead ions

Examples

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example 1

[0028] 1. Preparation of precursor powder by inverse microemulsion-gel method:

[0029] Prepare water phase I: use lead nitrate and ferric nitrate nonahydrate as raw materials to prepare a mixed metal solution with a mole of water of 1.5 mol, that is, water phase I. The concentration of iron ions is 0.05 mol / L, and the molar ratio of lead ions to iron ions is 1:9.

[0030] Preparation of water phase II: Mix concentrated ammonia water and deionized water to prepare an ammonia solution with 1.5 mol of water, that is, water phase II. The concentration of ammonia water is 1 mol / L.

[0031] Prepare two suspensions: each consisting of a mixture of 50 mL of n-octane, 0.4 mol of n-butanol, and 0.05 mol of cetyltrimethylammonium bromide (CTAB).

[0032] Preparation of microemulsion system I: Mix the above part of the suspension with water phase I to obtain microemulsion system I.

[0033] Preparation of microemulsion system II: Mix another part of the above suspension with water pha...

example 2

[0040] 1. Preparation of precursor powder by inverse microemulsion-gel method:

[0041]Prepare water phase I: mix lead nitrate, ferric nitrate nonahydrate and water to prepare a mixed metal solution with 1.5 mol of water, that is, water phase I. The concentration of iron ions is 0.05 mol / L, and the molar ratio of lead ions to iron ions is 1:10.

[0042] Preparation of water phase II: Mix concentrated ammonia water and deionized water to prepare an ammonia solution with 1.5 mol of water, that is, water phase II. The concentration of ammonia water is 1 mol / L.

[0043] Prepare two suspensions: each consisting of a mixture of 50 mL of n-octane, 0.4 mol of n-butanol, and 0.05 mol of cetyltrimethylammonium bromide (CTAB).

[0044] Preparation of microemulsion system I: Mix the above part of the suspension with water phase I to obtain microemulsion system I.

[0045] Preparation of microemulsion system II: Mix another part of the above suspension with water phase II to obtain micr...

example 3

[0053] 1. Preparation of precursor powder by inverse microemulsion-gel method:

[0054] Prepare water phase I: mix lead nitrate, ferric nitrate nonahydrate and water to prepare a mixed metal solution with 1.5 mol of water, that is, water phase I. The concentration of iron ions is 0.05 mol / L, and the molar ratio of lead ions to iron ions is 1:12.

[0055] Preparation of water phase II: Mix concentrated ammonia water and deionized water to prepare an ammonia solution with 1.5 mol of water, that is, water phase II. The concentration of ammonia water is 1 mol / L.

[0056] Prepare two suspensions: each consisting of a mixture of 50 mL of n-octane, 0.4 mol of n-butanol, and 0.05 mol of cetyltrimethylammonium bromide (CTAB).

[0057] Preparation of microemulsion system I: Mix the above part of the suspension with water phase I to obtain microemulsion system I.

[0058] Preparation of microemulsion system II: Mix another part of the above suspension with water phase II to obtain mic...

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Abstract

The invention discloses a method for induced-growing an Epsilon-ferric oxide nano-rod by lead ions, and belongs to the technical field of the novel nano permanent magnet material preparation. The method comprises the following steps: mixing lead nitrate, iron nitrate nonahydrate and water, and preparing mixed metal solution; mixing normal octane, cetyl trimethyl ammonium bromide and normal butanol, and preparing suspension liquid; mixing the suspension liquid with ammonium hydroxide and the mixed metal solution, and preparing two types of reversed-phase microemulsion; mixing two types of the reversed-phase microemulsion and executing the first time of the reaction, and adding tetraethoxysilane to execute the second time of the reaction after the first time of the reaction until the ending, to obtain a precursor, heating the precursor to obtain the powder-like Epsilon-ferric oxide nano-rod. The method is a technology method for stably synthesizing the Epsilon-ferric oxide nano-rod within the wider temperature range, is capable of providing the foundation for the synthesis of a lot of the Epsilon-ferric oxide nano permanent magnets, and providing the excellent reference for the synthetic process design of a similar nano metastable state material.

Description

technical field [0001] The invention belongs to the technical field of preparation of novel nanometer permanent magnetic materials. Background technique [0002] ε-iron oxide has a high magnetocrystalline anisotropy field, a huge coercive field at room temperature, and good magnetoelectric coupling properties, making it an excellent permanent magnet nanomagnet. It has a good application prospect in the design of magnetic, magnetic and dielectric sensitive devices and mass storage devices. However, since ε-iron oxide is a kind of metastable iron oxide, its existence is limited to the scale range of 15 to 50nm. Beyond this scale, it is very easy to transform into α-iron oxide. Therefore, it is extremely difficult to control its synthesis. This becomes a bottleneck problem for the application of this material. In addition, through particle shape control, the formation of ε-iron oxide nanorods can further increase the anisotropy field of the magnetocrystal, thereby realizing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y40/00
CPCC01G49/06C01P2002/72C01P2004/04C01P2004/16C01P2006/42
Inventor 刘俊亮于萍杨敏金奇梅殳怡孔雅静陈亚杰张明
Owner YANGZHOU UNIV
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