Method for preparing nano Fe3O4

A nano and powder technology, applied in the nano field, achieves the effects of low cost, good dispersion and strong practicability

Inactive Publication Date: 2008-07-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe 3 o 4 Also belongs to spinel ferrite, but prepared Fe by citric acid-nitrate sol-gel self-propagating combustion reaction 3 o 4 There are no reports yet

Method used

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  • Method for preparing nano Fe3O4
  • Method for preparing nano Fe3O4
  • Method for preparing nano Fe3O4

Examples

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Embodiment 1

[0023] Utilize the present invention, under air environment, 40 ℃, the Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O was dissolved in 50ml deionized water, where Fe 3+ The molar concentration is 0.4mol / l. Put the prepared mixed solution into a water bath for ultrasonic stirring for 30 minutes, and then evaporate in a 75°C water bath until it turns into a transparent colloid. The obtained wet gel was further dried in an oven set at 130°C for 45 minutes to remove the remaining moisture, and then the gel from which the remaining moisture was removed was quickly placed on a resistance furnace to heat until the gel began to self-propagate and burn. Then grind the fluffy material obtained by self-propagating combustion for 30 minutes to obtain a powder, press the powder into a block and place it in an atmosphere furnace, and finally sinter at 650°C for 10 hours in an argon atmosphere to obtain nano-Fe 3 o 4 Block sample S1. The XRD diffraction pattern, hysteresis loop diagram ...

Embodiment 2

[0025] Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O was dissolved in 40ml deionized water, where Fe 3+ The molar concentration is 0.5mol / l. The prepared mixed solution was placed in a water bath for ultrasonic stirring for 30 minutes, and then evaporated in a water bath at 77°C until it turned into a transparent colloid. The obtained wet gel was further dried in an oven set at 130°C for 35 minutes to remove the remaining moisture, and then the gel from which the remaining moisture was removed was quickly placed on a resistance furnace to heat until the gel began to self-propagate and burn. Then grind the fluffy material obtained by self-propagating combustion for 30 minutes to obtain a powder, put the powder in an atmosphere furnace, and finally sinter at 670°C for 11 hours in an argon atmosphere to obtain nano-Fe 3 o 4 Powder sample S2. The XRD diffraction pattern, hysteresis loop diagram and scanning electron micrograph of sample S2 are shown in Figure 1, Figure 2 and...

Embodiment 3

[0027] Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O was dissolved in 20ml deionized water, where Fe 3+ The molar concentration is 1mol / l. The prepared mixed solution was placed in a water bath for ultrasonic stirring for 40 minutes, and then evaporated in a water bath at 85°C until it turned into a transparent colloid. The obtained wet gel was further dried in an oven set at 130°C for 30 minutes to remove the remaining moisture, and then the gel from which the remaining moisture was removed was quickly placed on a resistance furnace to heat until the gel began to self-propagate and burn. Then grind the fluffy material obtained by self-propagating combustion for 30 minutes to obtain a powder, put the powder in an atmosphere furnace, and finally sinter at 680°C for 12 hours in an argon atmosphere to obtain nano-Fe 3 o 4 Powdered sample S3. The XRD diffraction diagram, hysteresis loop diagram and scanning electron micrograph diagram of sample S3 are shown in Fig. 1 , Fig. ...

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Abstract

The invention relates to a preparation method of a nanometer Fe3O4 which adopts a self-propagating combustion reaction method of a citric acid-nitrate sol gel including the following steps: a. the analytically pure Fe(NO3)3 9H2O and the analytically pure C6H8O7 H2O are dissolved into deionized water; b. the mixed water solution configured is placed into a water bath box for stirring by a supersonic wave and then is evaporated in the water bath until the solution turns into a transparent iron citric acid complex gel; c. the obtained wet gel is placed into a baking oven for a further drying to remove the moisture. The gel without moisture is heated by the resistance furnace until the gel becomes a natural state; d. after a self-propagating combustion, the precursor fluffy substance of the obtained Fe3O4 is ground for obtaining a power body which is sintered in an inert gas atmosphere furnace. At last, the temperature is naturally reduced to the room temperature; therefore to obtain nanometer Fe3O4 power body. The preparation method prepares Fe3O4 power body with high purity and non-pollution, which achieves the purpose of green synthesis.

Description

technical field [0001] The invention belongs to nanotechnology, in particular to a nano-Fe 3 o 4 method of preparation. Background technique [0002] Ferrite Fe 3 o 4 Because of its important application value in drug carrier and magnetic recording, it has aroused great interest, especially when people found that Fe 3 o 4 After becoming a half-metal material with 100% spin polarization, Fe 3 o 4 Once again, it has become the focus of extensive research. How to prepare nano Fe easily and conveniently 3 o 4 It is the key to realizing its application value. Nano-Fe at home and abroad 3 o 4 There have been many reports on the preparation of . [0003] At present, Fe is prepared by co-precipitation or reduction 3 o 4 The particle size is only tens of nanometers, and the dispersion is also very good, but the requirements for synthesis conditions are relatively high. Most methods require some expensive or even toxic chemical reagents and complex synthesis steps, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08
Inventor 袁松柳何惊华田召明王永强
Owner HUAZHONG UNIV OF SCI & TECH
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