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

A nanoparticle, ellipsoid technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that the product particle size is not uniform, the particle size controllable range is narrow, and the operability is not strong. and other problems, to achieve the effect of low cost, easy availability of raw materials, and wide controllable range

Active Publication Date: 2015-01-14
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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preparation example Construction

[0026] The ellipsoidal particle size of the present invention can be controlled α-Fe 2 O 3 The preparation method of nanoparticles includes the following steps:

[0027] a. Dissolve trivalent iron salt and hydroxyl or / and carbonyl surfactant in water or ethanol aqueous solution;

[0028] b. Heat to 100~180℃, react for 0.5~5h to prepare α-Fe 2 O 3 Seed crystal; the above reaction is generally carried out in a reactor, the solution is boiling, Fe 3+ Hydrolysis and [Fe(OH) 3 ] n Condensation 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 at no less than 500 rpm for 10 to 60 minutes;

[0031] e. Heat to 100~180℃ to react for 0.5~6h; the reaction is generally carried out in a reactor. In the boiling state, the hydroxyl or carbonyl group of the surfactant is easy to interact with Fe(OH) 3 The -OH forms a hydrogen bond and is adsorbed on the crystal surface. At the s...

Embodiment 1

[0043] The ellipsoidal particle diameter of this embodiment is controllable α-Fe 2 O 3 The preparation method of nanoparticles includes the following steps:

[0044] a. Weigh ferric nitrate according to the number of moles of 2.5, and weigh 30 grams of polyvinyl alcohol as a surfactant, both of which are dissolved in water to form a solution of 5L;

[0045] b. Heat to 150℃, react for 3h to prepare α-Fe 2 O 3 Seed; the above reaction is generally carried out in a reactor, the solution is boiling, Fe 3+ Hydrolysis and [Fe(OH) 3 ] n Condensation 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, washed with water and dispersed in 5L of water, and mechanically stirred at 3000rpm for 10 minutes to make a slurry;

[0048] e. Heat to 150℃ to react for 3h; the reaction is generally carried out in a reactor. In the boiling state, the hydroxyl or carbonyl group of the surfactant is easily combined with ...

Embodiment 2

[0052] The ellipsoidal particle diameter of this embodiment is controllable α-Fe 2 O 3 The preparation method of nanoparticles includes the following steps:

[0053] a. Weigh ferric chloride according to the number of moles of 5, and weigh 500 grams of ethylene glycol as a surfactant, both of which are dissolved in an aqueous ethanol solution to form a solution of 5L;

[0054] b. Heat to 100℃ and react for 6h to prepare α-Fe 2 O 3 Seed; the above reaction is generally carried out in a reactor, the solution is boiling, Fe 3+ Hydrolysis and [Fe(OH) 3 ] n Condensation 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, washed with water and dispersed in 5L ethanol aqueous solution, and mechanically stirred at 500 rpm for 60 minutes to make a slurry;

[0057] e. Heat to 100℃ to react for 6h; the reaction is generally carried out in a reaction kettle, in the boiling state, the hydroxyl or carbonyl gr...

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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 preparation method of iron oxide particles, in particular to an ellipsoidal particle diameter controllable α-Fe 2 O 3 Preparation method of nanoparticles. Background technique [0002] The main application of iron oxide is α-Fe 2 O 3 , Α-Fe 2 O 3 Nano particles, the main properties are good heat resistance, magnetism, light resistance, and also have the advantages of surface effect, small size effect, quantum size effect and macro quantum tunneling effect. The above properties make α-Fe 2 O 3 Shows many characteristics different from ordinary size materials. [0003] At the same time, α-Fe 2 O 3 Because it is non-toxic, harmless, cheap, and chemically stable, 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 sheet, and spindle nano α-Fe 2 O 3 There are many applications for particles. Of which spherical nano α-Fe 2 O 3...

Claims

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Application Information

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Patent Type & Authority Patents(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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