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Method for preparing ferrite nanowire with diameter gradient

A ferrite, nanowire technology, used in solid-state chemical plating, coating, inorganic raw rayon, etc.

Active Publication Date: 2014-06-25
瑞安市浙工大技术转移中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among the currently reported synthesized magnetic nanowires, whether they are alloys or ferrites, almost all are nanowires with uniform diameters, and magnetic alloy nanowires with uniform diameters all have the characteristics of magnetic anisotropy, which makes a single Magnetic nanowires can generally only serve as an information storage unit in a single domain state

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  • Method for preparing ferrite nanowire with diameter gradient
  • Method for preparing ferrite nanowire with diameter gradient
  • Method for preparing ferrite nanowire with diameter gradient

Examples

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Embodiment 1

[0026] A method for preparing cobalt ferrite nanowires with gradient diameters, comprising the steps of:

[0027] (1) Prepare the template

[0028] (1-1) Select high-quality and high-purity (purity 99.999%) aluminum sheets, anneal at 500°C for 4 hours, sonicate in acetone for 10 minutes, and then soak in sodium hydroxide solution with a concentration of 5% (wt) for 5 minutes. Finally, the pretreatment of the aluminum sheet was completed by ultrasonication in acetone for 3 minutes.

[0029] (1-2) Using the principle of electrochemical corrosion to prepare aluminum oxide films with nanopores with gradient diameters. This process adopts two electrochemical corrosion methods, the first oxidation is corroded for 4.5 hours at a DC voltage of 60V, and the electrolyte is an oxalic acid solution with a concentration of 0.3M.

[0030] (1-3) Remove primary oxide film. Place the aluminum sheet in 6% H 3 PO 4 (wt) and 1.5%GrO 3 (wt) in the mixed solution at 65°C for 2 hours to remove...

Embodiment 2

[0041] A method for preparing a nickel ferrite nanowire with a gradient diameter, comprising the following steps: (1) preparing a template

[0042] (1-1) Select high-quality and high-purity (purity 99.999%) aluminum sheets, anneal at 500°C for 2 hours, sonicate in acetone for 10 minutes, and then soak in sodium hydroxide solution with a concentration of 5% (wt) for 5 minutes. Finally, the pretreatment of the aluminum sheet was completed by ultrasonication in acetone for 3 minutes.

[0043] (1-2) Using the principle of electrochemical corrosion to prepare aluminum oxide films with nanopores with gradient diameters. This process adopts two electrochemical corrosion methods, the first oxidation is corroded for 5 hours at a DC voltage of 40V, and the electrolyte is an oxalic acid solution with a concentration of 0.35M.

[0044] (1-3) Remove primary oxide film. Place the aluminum sheet in 6% (wt) H 3 PO 4 and 1.5% (wt) GrO 3 Remove the oxide film once in the mixed solution at ...

Embodiment 3

[0055] A method for preparing a cobalt ferrite nanowire with a gradient diameter, comprising the following steps: (1) preparing a template

[0056] (1-1) Select high-quality and high-purity (purity 99.999%) aluminum sheets, anneal at 500°C for 3 hours, sonicate in acetone for 10 minutes, and then soak in sodium hydroxide solution with a concentration of 5% (wt) for 5 minutes. Finally, the pretreatment of the aluminum sheet was completed by ultrasonication in acetone for 3 minutes.

[0057] (1-2) Using the principle of electrochemical corrosion to prepare aluminum oxide films with nanopores with gradient diameters. This process adopts two electrochemical corrosion methods, the first oxidation is corroded at a DC voltage of 60V for 5 hours, and the electrolyte is an oxalic acid solution with a concentration of 0.4M.

[0058] (1-3) Remove primary oxide film. Place the aluminum sheet in 6% H 3 PO 4 (wt) and 1.5%GrO 3 (wt) in the mixed solution at 65°C for 2 hours to remove th...

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Abstract

The invention provides a method for preparing a ferrite nanowire with diameter gradient. The method comprises the following steps: preparing an alumina film with nanopores with diameter gradient by utilizing an electrochemical corrosion principle, depositing sol in the nanopores by utilizing sol-gel deposition method on the basis of the prepared anode alumina template, and gelling the sol in the nanopores to generate a target nanowire by utilizing high-temperature calcination. According to the method, ferrite alloy nanowires of which the diameters are uniformly changed can be prepared, and the method is a new attempt and has far-reaching significance on promotion of the development of magnetic recording industry.

Description

(1) Technical field [0001] The invention relates to a method for preparing ferrite nanowires with diameter gradients. (2) Background technology [0002] Nanowire refers to a one-dimensional linear material with a diameter in the nanoscale range (1-100nm) and a high aspect ratio. Nanowires not only have the characteristics of nanoparticles, such as quantum size effect, small size effect, surface effect and macroscopic quantum tunneling effect, but also have new effects caused by the combination of nanostructures, such as quantum coupling and synergistic effects, thus showing unique electronic, magnetic, optical and catalytic properties. [0003] For magnetic nanowires, due to the high aspect ratio, it will have significant magnetic anisotropy, especially when the magnetic substance enters the nanoscale, the multi-domain will become a single domain, thus showing a very strong superparamagnetic effect. If each magnetic nanowire is used as an information storage unit, the stor...

Claims

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Application Information

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IPC IPC(8): D01F9/08C04B35/26C23C20/08
Inventor 胡军陈耀林陈爱民汪晶
Owner 瑞安市浙工大技术转移中心