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A kind of preparation method of silica-barium titanate heterogeneous colloidal crystal

A technology of colloidal crystals and barium titanate, which is applied in the direction of silicon oxide, silicon dioxide, titanium dioxide, etc., can solve the problems of unfavorable development and application, high requirements on the particle size distribution of colloidal balls, and low dielectric constant.

Inactive Publication Date: 2015-11-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the self-assembly method is mainly used to prepare colloidal crystals. This type of method has high requirements on the shape and particle size distribution of the colloidal spheres used, mainly including silica and polymer colloidal spheres. The dielectric constant of these materials is low. For The photonic band gap of colloidal crystals is limited, which is not conducive to its development and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing silicon oxide-barium titanate heterogeneous colloidal crystals, comprising the steps of:

[0016] (1) Prepare a KCl aqueous solution with a mass concentration of 0.1%, respectively configure an ethanol solution A of tetraethyl orthosilicate and an ethanol solution B of ammonia water, 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 KCl aqueous solution is added to solution B, and the volume ratio of KCl aqueous solution to ammonia water is 1:1 , and then add solution A to solution B under constant stirring. After 20 hours of reaction, the precipitate is separated, washed by centrifugation and dried at 50°C to obtain surface-modified SiO 2 Nanosphere or submicron spherical powder;

[0017] (2) Weighing SiO2 2 Powder, ultrason...

Embodiment 2

[0021] A method for preparing silicon oxide-barium titanate heterogeneous colloidal crystals, comprising the steps of:

[0022] (1) Prepare a KCl aqueous solution with a mass concentration of 0.15%, respectively configure an ethanol solution A of tetraethyl orthosilicate and an ethanol solution B of ammonia water, 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 3.5:1, and then 2-4mL of KCl aqueous solution is added to solution B, and the volume ratio of KCl aqueous solution to ammonia water is 1: 5. 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 or submicron spherical powder;

[0023] (2) Weighing SiO2 2 Powder, ultrasonically d...

Embodiment 3

[0027] A method for preparing silicon oxide-barium titanate heterogeneous colloidal crystals, comprising the steps of:

[0028] (1) Prepare a KCl aqueous solution with a mass concentration of 0.125%, respectively configure an ethanol solution A of tetraethyl orthosilicate and an ethanol solution B of ammonia water, 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 6.85:1, the volume ratio of the amount of ammonia water to tetraethyl orthosilicate is 3.15:1, and then 3mL of KCl aqueous solution is added to solution B, and the volume ratio of KCl aqueous solution to ammonia water is 1:2.65, 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 or submicron spherical powder;

[0029] (2) Weighing SiO2 2 P...

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Abstract

The invention discloses a method for preparing a silicon oxide-barium titanate heterogeneous colloidal crystal in periodically ordered arrangement. The method comprises steps of modifying the surface of a silicon dioxide colloidal sphere by KCl, preparing silicon dioxide colloidal crystal templates of different gap sizes and arrangement through movement of the charged silicon dioxide colloidal spheres in an electric field and controlling of pulling rate of a substrate, filling the prepared barium titanate gel in the colloidal crystal templates, drying and calcining by double substrates so as to obtain the silicon oxide-barium titanate heterogeneous colloidal crystal.

Description

technical field [0001] The invention relates to a method for preparing silicon oxide-barium titanate heterogeneous colloidal crystals. Background technique [0002] Photonic crystals are periodically arranged in one-dimensional, two-dimensional or three-dimensional directions by dielectric materials with different dielectric constants or refractive indices, so as to selectively inhibit or modulate the propagation of light of specific wavelengths. The role of materials, in which monodisperse colloidal spheres are arranged in a certain medium in a three-dimensional orderly structure called colloidal crystals. At present, the self-assembly method is mainly used to prepare colloidal crystals. This type of method has high requirements on the shape and particle size distribution of the colloidal spheres used, mainly including silica and polymer colloidal spheres. The dielectric constant of these materials is low. For The photonic bandgap of colloidal crystals is limited, which is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01G23/053C03C17/34
Inventor 伍媛婷王秀峰沈清
Owner SHAANXI UNIV OF SCI & TECH