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Preparation method for monodisperse barium titanate nanopowder

A barium titanate powder and nano-powder technology, applied in nanotechnology, chemical instruments and methods, titanium compounds, etc., can solve the problems of high self-generated pressure, achieve light agglomeration, mild synthesis conditions, and controllable particle size Effect

Inactive Publication Date: 2012-06-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis temperature commonly used in the hydrothermal method is generally 150 ° C ~ 400 ° C, and the self-generated pressure is relatively high, so a high-pressure reactor is required, and the reaction medium is strongly alkaline, which has a certain degree of danger.

Method used

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  • Preparation method for monodisperse barium titanate nanopowder
  • Preparation method for monodisperse barium titanate nanopowder
  • Preparation method for monodisperse barium titanate nanopowder

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The preparation method of monodisperse barium titanate nano powder of this embodiment includes the following steps:

[0022] Step 1: Add 0.05 mol of tetrabutyl titanate to 0.3 mol of absolute ethanol and stir to form the original solution. Mix 0.6 mol of absolute ethanol with 0.003 mol of nitric acid and 0.15 mol of deionized water to form a dropwise addition Solution

[0023] Step 2: Slowly drop the dropping solution in step 1 into the original solution under strong stirring, the dropping acceleration rate is 15-20 drops / min, and the light yellow transparent TiO can be formed after the dropping is completed 2 Sol

[0024] Step 3: Take 10ml of TiO from step 2 2 The sol is poured into the lining of a polytetrafluoroethylene high-pressure reactor with a volume of 80ml, 0.014mol of barium hydroxide octahydrate and 45ml of deionized water are added to form a precursor solution with an alkalinity of 0.5mol / L, which is carried out with a magnetic stirrer Stir for 20min;

[0025] Ste...

Embodiment 2

[0029] The preparation method of monodisperse barium titanate nano powder of this embodiment includes the following steps:

[0030] Step 1: Add 0.05 mol of tetrabutyl titanate to 0.3 mol of absolute ethanol and stir to form the original solution. Mix 0.6 mol of absolute ethanol with 0.003 mol of nitric acid and 0.15 mol of deionized water to form a dropwise addition Solution

[0031] Step 2: Slowly drop the dropping solution in step 1 into the original solution under strong stirring, the dropping acceleration rate is 15-20 drops / min, and the light yellow transparent TiO can be formed after the dropping is completed 2 Sol

[0032] Step 3: Take 10ml of TiO from step 2 2 The sol was poured into the lining of a polytetrafluoroethylene high-pressure reactor with a volume of 80ml, and 0.028mol of barium hydroxide octahydrate and 45ml of deionized water were added to form a precursor solution with an alkalinity of 1.0mol / L, which was carried out with a magnetic stirrer. Stir for 20min;

[0...

Embodiment 3

[0037] The preparation method of monodisperse barium titanate nano powder of this embodiment includes the following steps:

[0038] Step 1: Add 0.05 mol of tetrabutyl titanate to 0.3 mol of absolute ethanol and stir to form the original solution. Mix 0.6 mol of absolute ethanol with 0.003 mol of nitric acid and 0.15 mol of deionized water to form a dropwise addition Solution

[0039] Step 2: Slowly drop the dropping solution in step 1 into the original solution under strong stirring, the dropping acceleration rate is 15-20 drops / min, and the light yellow transparent TiO can be formed after the dropping is completed 2 Sol

[0040] Step 3: Take 10ml of the TiO2 sol from Step 2 and pour it into the lining of a polytetrafluoroethylene high-pressure reactor with a volume of 80ml, add 0.014mol of barium hydroxide octahydrate and 45ml of deionized water to form an alkalinity of 1.0mol / L Use a magnetic stirrer to stir for 20 min;

[0041] Step 4: Put the lining containing the precursor solut...

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Abstract

The invention discloses a preparation method for monodisperse barium titanate nanopowder combining with sol-gel method and hydrothermal method, comprising the following steps of: preparing original solution and dripping solution from absolute ethyl alcohol, tetrabutyl titanate, nitric acid and deionized water; mixing the dripping solution with the original solution to obtain TiO2 sol; pouring the TiO2 sol in the liner of a polytetrafluoroethylene high-pressure reactor, adding barium octahydrate precursor solution of different concentrations and then stirring; placing the liner in the step 3 in a stainless steel high-pressure reactor, sealing and then placing in a high-temperature oven to perform hydrothermal reaction; finishing the reaction and cooling, then opening the reactor, filtering and washing the reactants to be neutral by using the deionized water and the absolute ethyl alcohol, and then drying the reactants in the oven , so as to obtain the monodisperse barium titanate nanopowder. The preparation method for monodisperse barium titanate nanopowder disclosed by the invention combines with the advantages of sol-gel method and hydrothermal method for preparing powder, so that the synthesised barium titanate nanoparticles have the advantages of being high in purity, controllable in particle size, complete in crystal particle development etc; and the preparation method for monodisperse barium titanate nanopowder is simple in equipment, practicable in operation and convenient for industrialized batch production.

Description

Technical field [0001] The present invention involves a preparation method of titanic acid nano powder, and especially involves a solitary-water heat preparation method with a single dispersion titanic acid nanofan. Background technique [0002] As an important electronic ceramic material, titanic acid (BATIO 3 ) Powder is widely used in preparation of ceramic capacitors (MLCC), heat -sensitive elements, iron voltage electrical components, etc. It has high -agency constant and excellent iron electricity, voltage and insulation performance. It is known as the pillar of the electronic ceramic industry.It is also a hot issue in the field of material science today.The preparation methods for nano-titanic acid powder at home and abroad are traditional solid-phase sintering methods, solution-gel methods, water and heat methods, and common precipitation methods.Traditional solid -phase sintering method is to bring BACO 3 TiO 2 Wait for Moore mixing and forging under high temperature con...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y40/00
Inventor 朱孔军郑红娟顾洪汇裘进浩季宏丽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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