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Method for preparing Fe3O4 nanorods in gradient magnetic field

A gradient magnetic field and nanorod technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of reduced reaction rate and increased reaction time, and achieve improved reaction efficiency and fewer impurity particles , uniform length and diameter

Inactive Publication Date: 2013-01-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that when the ammonia gas enters the mixed solution to obtain an alkaline solution, it is diluted by excess water, resulting in a decrease in the reaction rate and an increase in the reaction time.

Method used

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  • Method for preparing Fe3O4 nanorods in gradient magnetic field
  • Method for preparing Fe3O4 nanorods in gradient magnetic field
  • Method for preparing Fe3O4 nanorods in gradient magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare 1mol / L FeCl in volumetric flask 3 ·6H 2 O and FeSO 4 ·7H 2 O solution; mix the two solutions evenly with a volume ratio of 1.85:1, transfer them to a separatory funnel, and connect them to the ammonia gas collection bottle through a rubber stopper; place the gas collection bottle in an oil bath at 80°C, And place the oil bath between the magnetic poles, so that the magnetic field strength decreases from bottom to top in the vertical direction, and the product of magnetic induction and field strength gradient is 10T 2 / m; After heating to the constant temperature of ammonia gas, add the mixed solution dropwise. After the dropwise addition, keep the reaction for 50 minutes; cool to room temperature, wash the product with distilled water and ethanol respectively; dry it in a vacuum oven at 25°C for 6 hours and then measure the sample. Tests showed that the resulting Fe 3 o 4 The nanorods have a diameter of about 35nm, a length of about 330nm, and a saturation ...

Embodiment 2

[0036] Prepare 3mol / L of FeCl in the volumetric flask 3 ·6H 2 O and FeSO 4 ·7H 2 O solution; mix the two solutions evenly with a volume ratio of 1.9:1, transfer them to a separatory funnel, and connect them to the ammonia gas collection bottle through a rubber stopper; place the gas collection bottle in an oil bath at 85°C, And place the oil bath between the magnetic poles, so that the magnetic field strength decreases from bottom to top in the vertical direction, and the product of magnetic induction and field strength gradient is 40T 2 / m; After heating to the constant temperature of ammonia gas, add the mixed solution dropwise. After the dropwise addition, keep the reaction for 45 minutes, cool to room temperature, and wash the product with distilled water and ethanol respectively; dry it in a vacuum oven at 25°C for 6 hours and then measure the sample. Tests showed that the resulting Fe 3 o 4 The nanorod has a diameter of about 37nm, a length of about 340nm, and a sat...

Embodiment 3

[0038] Prepare 2mol / L of FeCl in the volumetric flask 3 ·6H 2 O and FeSO 4 ·7H 2 O solution; mix the two solutions evenly with a volume ratio of 1.85:1, transfer them to a separatory funnel, and connect them to the ammonia gas collection bottle through a rubber stopper; place the gas collection bottle in an oil bath at 90°C, Place the oil bath between the magnetic poles so that the magnetic field strength decreases from bottom to top in the vertical direction, and the product of magnetic induction and field strength gradient is 50T 2 / m; After heating to the constant temperature of ammonia gas, add the mixed solution dropwise. After the dropwise addition, keep the reaction for 50 minutes, cool to room temperature, and wash the product with distilled water and ethanol respectively; dry it in a vacuum oven at 25°C for 6 hours and then measure the sample. Tests showed that the resulting Fe 3 o 4 The nanorod has a diameter of about 39nm, a length of about 370nm, and a saturat...

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Abstract

The invention provides a method for preparing Fe3O4 nanorods in a gradient magnetic field, which comprises the following steps: under the action of a gradient magnetic field, dropwisely adding a solution containing iron ions and ferrous ions into a reactor charged with ammonia gas, and reacting at 80-90 DEG C for 40-50 minutes; separating a black precipitate from the solution; and cooling to room temperature, respectively washing with distilled water and ethanol, and carrying out vacuum drying to obtain the Fe3O4 nanorods. The scanning electron microscope, transmission electron microscope, X-ray diffraction and other analyses indicate that the prepared Fe3O4 nanorods have the advantages of regular and orderly structure, complete crystals and uniform morphology, the diameters are 35-45nm, and the lengths are 300-400nm; the analysis on the magnetic properties of the product at room temperature detects that the magnetic remanence and coercive force of the product can be neglected, the saturation magnetization is 54-86 emu / g, and thus, the product appears superparamagnetism; and the magnetic response analysis illustrates that the Fe3O4 nanorods also have high magnetic response, and such characteristic has great potential application prospects in the fields of drug delivery systems and catalysis.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and relates to a ferric oxide (Fe 3 o 4 ) preparation method of magnetic nanorods, especially related to the preparation of Fe under a gradient magnetic field 3 o 4 nanorod approach. Background technique [0002] In recent years, Fe 3 o 4 Because of its unique magnetic properties and environmental stability, it has attracted much attention from researchers. Because the magnetic domain structure directly affects the performance and application range of magnetic materials, the controlled synthesis of the structure and morphology of magnetic nanomaterials has become the core of the preparation of magnetic materials. Many researchers have attempted to use different methods to modify the morphology of magnetic nanoparticles, among which the one-dimensional nanostructures mainly include nanowires and nanorods. However, in many synthetic methods, most of them are based on solid-state templat...

Claims

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Application Information

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IPC IPC(8): C01G49/08B82Y30/00
Inventor 张春莫尊理张平
Owner NORTHWEST NORMAL UNIVERSITY
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