Preparation method of ellipsoidal particle size-controllable alpha-Fe2O3 nano particle

A nanoparticle and ellipsoidal technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of uneven particle size, narrow controllable range of particle size, and poor operability and other issues, to achieve the effect of low cost, easy access to raw materials, and wide controllable range

Active Publication Date: 2013-04-17
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD +1
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Problems solved by technology

[0005] The ellipsoidal α-Fe can be obtained by using the existing above-mentioned method 2 o 3 Nanoparticles, but the particle size of the obtained product is not uniform enough, the particle size range is large, and during the preparation process, the controllable range of the particle size is narrow, and the operability is not strong, so looking for a method that can prepare ellipsoidal α-Fe 2 o 3 Nanoparticles and size-controllable synthesis methods become extremely important

Method used

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  • Preparation method of ellipsoidal particle size-controllable alpha-Fe2O3 nano particle

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[0026] Ellipsoid particle size controllable α-Fe of the present invention 2 o 3 A method for preparing nanoparticles, comprising the following steps:

[0027] a. Dissolving ferric salt and hydroxyl or / and carbonyl surfactant in water or ethanol aqueous solution;

[0028] b. Heating to 100-180°C, reacting for 0.5-5 hours to prepare α-Fe 2 o 3 Seed crystal; the above reaction is generally carried out in a reactor, and the solution is in a boiling state, and the Fe 3+ Hydrolysis and [Fe(OH) 3 ] n Polycondensation leads to α-Fe 2 o 3 Seed generation;

[0029] c. Adjust pH=9~11;

[0030] d. The filtered solids are washed and dispersed in water or ethanol aqueous solution, and stirred for 10-60 minutes at a speed of not less than 500rpm for beating;

[0031] e. Heating to 100-180°C for 0.5-6 hours; the reaction is generally carried out in a reaction kettle. In the boiling state, the hydroxyl or carbonyl of the surfactant is easy to react with Fe(OH) 3 The -OH forms hy...

Embodiment 1

[0043] The ellipsoidal particle diameter of this embodiment is controllable α-Fe 2 o 3 A method for preparing nanoparticles, comprising the following steps:

[0044] a. Take ferric nitrate by weighing 2.5 moles, and take by weighing 30 grams of polyvinyl alcohol as surfactant, both of which are dissolved in water to form 5L of solution;

[0045] b. Heating to 150°C, reacting for 3 hours, and preparing α-Fe 2 o 3 Seed crystal; the above reaction is generally carried out in a reactor, and the solution is in a boiling state, and the Fe 3+ Hydrolysis and [Fe(OH) 3 ] n Polycondensation leads to α-Fe 2 o 3 Seed generation;

[0046] c. Add 1mol / L NaOH until the pH reaches 10;

[0047] d. The filtered solid forms a filter cake, which is washed with water and dispersed in 5L of water, and mechanically stirred at a speed of 3000rpm for 10 minutes to make a slurry;

[0048] e. Heating to 150°C for 3 hours; the reaction is generally carried out in a reaction kettle. In the b...

Embodiment 2

[0052] The ellipsoidal particle diameter of this embodiment is controllable α-Fe 2 o 3 A method for preparing nanoparticles, comprising the following steps:

[0053] a. Take ferric chloride by weighing 5 moles, and take by weighing 500 grams of ethylene glycol as surfactant, both are dissolved in the aqueous solution of ethanol to form solution 5L;

[0054] b. Heating to 100°C, reacting for 6 hours, and preparing α-Fe 2 o 3 Seed crystal; the above reaction is generally carried out in a reactor, and the solution is in a boiling state, and the Fe 3+ Hydrolysis and [Fe(OH) 3 ] n Polycondensation leads to α-Fe 2 o 3 Seed generation;

[0055] c. Add 1mol / L NaOH until the pH reaches 9;

[0056] d. The filtered solid forms a filter cake, which is washed with water and dispersed in a 5L ethanol aqueous solution, and mechanically stirred at a speed of 500 rpm for 60 minutes to make a slurry;

[0057] e. Heating to 100°C for 6 hours; the reaction is generally carried out i...

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Abstract

The invention discloses a preparation method of an ellipsoidal particle size-controllable alpha-Fe2O3 nano particle. By adopting the raw material combination of trivalent iron salts and hydroxyl or/and carbonyl surfactant, the hydroxyl or the carbonyl and -OH of Fe(OH)3 for hydrogen bonds to be absorbed on the surfaces of crystals; the irregular motion of the surfactant molecules containing the hydroxyl or the carbonyl is intensified so as to form an ellipsoidal alpha-Fe2O3 seed crystal through induction; an obtained product is uniform in particle size; in the preparation process, the overall participation of the surfactant effectively suppresses hard agglomeration, the controllable range of the particle size is wide, raw materials are easily available and the cost is low, and the preparation process is simple and convenient; the particle size distribution of the prepared ellipsoidal alpha-Fe2O3 nano particle is 90-800nm +/-10 nanometers, the particle size can be regulated and controlled within the range of 90-800nm, the capacity is increased, and industrialization is realized.

Description

technical field [0001] The invention relates to a method for preparing iron oxide particles, in particular to an ellipsoid particle size controllable α-Fe 2 o 3 Preparation method of nanoparticles. Background technique [0002] The most widely used iron oxide is mainly α-Fe 2 o 3 , α-Fe 2 o 3 The main properties of nanoparticles are good heat resistance, magnetism, light resistance, and at the same time have the advantages of surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect. The above properties make α-Fe 2 o 3 Exhibits many characteristics different from ordinary size materials. [0003] At the same time, α-Fe 2 o 3 Because of its non-toxic, harmless, cheap, and good chemical stability, it is also more and more widely used in rubber, ceramics, pigments, building materials, smart materials and other fields. In the prior art, spherical, cubic, square plate-shaped, spindle-shaped nano-α-Fe 2 o 3 There are many applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y30/00
Inventor 叶兴福江林戴曛晔
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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