Preparation method of ferromagnetic nano wire

A technology of ferromagnetic nanowires and ferric nitrate, which is applied in chemical instruments and methods, single crystal growth, polycrystalline material growth, etc., can solve the problems of low yield and increased production cost, and achieve high magnetic coercive force, diameter and The effect of controllable length and high magnetic saturation intensity

Inactive Publication Date: 2007-09-19
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

These two methods require selection of substrate, magnetic field or high temperature and low yield, which greatly increases the cost of preparation

Method used

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  • Preparation method of ferromagnetic nano wire

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example 1

[0012] Take 14.08 grams of ferric nitrate hexahydrate and add it to 1L of deionized water to prepare ferric nitrate solution, and then add 0.1mol / L sodium hydroxide solution dropwise to the ferric nitrate solution under the condition of stirring at 500 rpm with a magnetic stirrer until the pH of the solution Value is 7, 4 grams of Fe(OH) obtained by filtering with filter paper 3 Mix with 80 grams of sodium chloride and add it to the ball milling tank for ball milling. The ball-to-material ratio is 10:1, the milling speed is 1000 rpm, and the milling time is 48 hours to obtain 84 grams of Fe(OH). 3 / NaCl composite powder; spread the obtained composite powder in a quartz boat, and place the quartz boat in the constant temperature zone in the middle of the quartz reaction tube. First, pass nitrogen into the reaction tube to remove air, and increase the temperature to 600 at a temperature of 8°C / min After ℃, pass in H at 150mL / min 2 Gas for 2 hours, Fe(OH) 3 / NaCl is reduced to Fe / NaC...

example 2

[0014] The specific method and steps are the same as in Example 1. The different conditions are: add 14.08 g of ferric nitrate hexahydrate to 0.5L of deionized water to prepare a ferric nitrate solution, the hydrogen reduction temperature is 300 ℃, and finally the pure average diameter is 32nm and the average length is 10μm ferromagnetic nanowires.

example 3

[0016] The specific method and steps are the same as in Example 1. The different conditions are: add 14.08 grams of ferric nitrate hexahydrate to 0.25L of deionized water to prepare a ferric nitrate solution, the hydrogen reduction temperature is 500 ℃, and finally the pure average diameter is 45nm and the average length is 12.5μm ferromagnetic nanowires.

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Abstract

The invention disclose a method for preparing ferromagnetic nanometer line, which belongs to the technology for preparing ferromagnetic nanometer line. The method includes the processes of: Fe(OH)3 is produced by adding sodium hydroxide or ammonia in preproduced ferric nitrate solution, then mixed with sodium chloride based on certain mass ratio and adding them in ball-mill jar, then ball milling, accordingly complex powder is produced; the said complex powder Fe(OH)3/NaCl is reduced to Fe/NaCl by hydrogen gas at certain temperature to produce primary ferromagnetic nanometer line; pure diameter and length controlled ferromagnetic nanometer line is producing by dissolving primary ferromagnetic nanometer line in deionized water and washing by supersonic wave. The advantage of the invention is that, using sodium chloride which is easy to be eliminated with low price and without the pollution as carrier, the method is simple without the pollution, and diameter and length of ferromagnetic nanometer line is controllable, with high magnetic saturation strength and coercive force.

Description

Technical field [0001] The invention relates to a preparation method of ferromagnetic nanowires, which belongs to the preparation technology of ferromagnetic nanowires. Background technique [0002] With the development of the information age, the requirements for information recording density are getting higher and higher. Although magnetic recording is the main body of current information recording, but limited by the superparamagnetism of magnetic recording materials, the traditional magnetic recording mode has gradually reached its limit of 50Gb / 6.45cm 2 . Therefore, finding new recording modes is a research topic that people pay attention to. Currently, quantum magnetic recording and magnetoelectronic recording are two typical representatives for achieving ultra-high density information recording. Among them, the recording density of magnetic nanowires can exceed 100Gb / 6.45cm 2 In addition, iron nanowires can also be used as a catalyst for the growth of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B29/62B22F9/22C21B15/02
Inventor 赵乃勤何春年师春生杜希文李家俊
Owner TIANJIN UNIV
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