Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of cubic phase BaTiO3 hollow nanospheres

A technology of hollow spheres and cubic phases, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low material density, large particle size, and many impurities, and achieve good arrangement periodicity, uniform gap size, The effect of uniform particle size distribution

Inactive Publication Date: 2014-06-25
SHAANXI UNIV OF SCI & TECH
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the barium titanate powder obtained by the traditional solid-state reaction method has the disadvantages of large particle size, many impurities, uneven chemical composition and serious agglomeration, which affects the performance of electronic ceramics, and cannot adapt to the small, light and high-quality electronic components. The trend of reliable development, for this purpose, the preparation of nano-BaTiO with higher purity by wet chemical method 3 Powder has become a hot spot, including hydrothermal method, microwave hydrothermal method, sol-gel method, co-precipitation method, bimetallic alkoxide method, solvothermal method, direct precipitation method, etc. How to obtain good dispersion and large specific surface area The barium titanate nanopowder is still a research hotspot
BaTiO 3 Hollow spheres not only have a large specific surface area and low material density, but also facilitate the dispersion of particles, however, BaTiO with good dispersion and uniform particle size distribution can be prepared 3 Nanohollow spheres still to be explored

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A cubic BaTiO 3 A method for preparing hollow nanospheres, comprising the steps of:

[0016] (1) Prepare a LiCl aqueous solution with a mass concentration of 0.1%, and prepare an ethanol solution A of tetraethyl orthosilicate and an ethanol solution B of ammonia respectively, wherein the amount of absolute ethanol in solution A and solution B is equal, and the total amount of absolute ethanol is equal to The volume ratio of ammonia water is 5:1, the volume ratio of the amount of ammonia water to tetraethyl orthosilicate is 2:1, and then 2mL of LiCl aqueous solution is added to solution B, and the volume ratio of LiCl aqueous solution to ammonia water is 1:1. Then, solution A was added to solution B under constant stirring, and after 20 hours of reaction, the precipitate was separated, washed by centrifugation and dried at 50°C to obtain surface-modified SiO 2 nanosphere particles;

[0017] (2) Weighing SiO2 2 Nanoparticles, ultrasonically dispersed in ethanol, ultras...

Embodiment 2

[0022] A cubic BaTiO 3 A method for preparing hollow nanospheres, comprising the steps of:

[0023] (1) Prepare a LiCl aqueous solution with a mass concentration of 0.15%, and prepare an ethanol solution A of tetraethyl orthosilicate and an ethanol solution B of ammonia respectively, wherein the amount of absolute ethanol in solution A and solution B is equal, and the total amount of absolute ethanol is equal to The volume ratio of ammonia water is 14.3:1, the volume ratio of the amount of ammonia water to tetraethyl orthosilicate is 4:1, then add 2-3.5mL LiCl aqueous solution to solution B, the volume ratio of LiCl aqueous solution to ammonia water is 1 : 5, and then add solution A to solution B under constant stirring, after 22 hours of reaction, separate the precipitate, centrifuge and wash and dry at 60°C to obtain surface-modified SiO 2 nanosphere particles;

[0024] (2) Weighing SiO2 2 Nanoparticles, which were ultrasonically dispersed in methanol for 3 hours to obtai...

Embodiment 3

[0029] A cubic BaTiO 3 A method for preparing hollow nanospheres, comprising the steps of:

[0030](1) Prepare a LiCl aqueous solution with a mass concentration of 0.125%, and prepare an ethanol solution A of tetraethyl orthosilicate and an ethanol solution B of ammonia respectively, wherein the amount of absolute ethanol in solution A and solution B is equal, and the total amount of absolute ethanol is equal to The volume ratio of ammonia water is 12.5:1, the volume ratio of the amount of ammonia water to tetraethyl orthosilicate is 3.15:1, and then 3mL of LiCl aqueous solution is added to solution B, the volume ratio of LiCl aqueous solution to ammonia water is 1:2.25, Then, solution A was added to solution B under constant stirring, and after 21 hours of reaction, the precipitate was separated, washed by centrifugation and dried at 55°C to obtain surface-modified SiO 2 nanosphere particles;

[0031] (2) Weighing SiO2 2 Nanoparticles, ultrasonically dispersed in methanol,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of BaTiO3 hollow nanospheres. The cubic phase BaTiO3 hollow nanospheres which are more uniform in particle size distribution can be obtained by obtaining silicon dioxide colloidal nanospheres with better dispersibility and more uniform particle size distribution by using LiCl as a surface modifier, assembling the silicon dioxide colloidal nanospheres on an ITO (indium-tin-oxide) glass substrate by utilizing the action of an electric field to form a silicon dioxide colloidal crystal template, filling barium titanate semigel, calcining and removing the silicon dioxide colloidal crystal template.

Description

technical field [0001] The invention relates to a cubic phase BaTiO 3 Preparation method of nano hollow spheres. Background technique [0002] BaTiO 3 With a typical perovskite structure, it is the basic matrix material of titanate series electronic ceramics. It has the characteristics of high dielectric constant and low dielectric loss, and has excellent piezoelectric, ferroelectric, withstand voltage and insulating properties. It is widely used in the fields of optics, heat, electronics, and acoustics, and is mainly used in the manufacture of electronic components such as pressure sensors, thermistors, capacitors, microwave devices, and memory elements. The barium titanate powder obtained by the traditional solid-state reaction method has the disadvantages of large particle size, many impurities, uneven chemical composition and serious agglomeration, which affects the performance of electronic ceramics and cannot adapt to the small, light and high-quality electronic comp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01G23/00B82Y30/00B82Y40/00
Inventor 伍媛婷李辉王秀峰江红涛
Owner SHAANXI UNIV OF SCI & TECH