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Process for preparing silicon dioxide colloid crystal with variable lattice constant

A silicon dioxide, lattice constant technology, applied in chemical instruments and methods, crystal growth, single crystal growth and other directions, can solve problems such as easy coagulation, and achieve the effect of improving surface charge density

Inactive Publication Date: 2007-08-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polystyrene spheres are easy to assemble due to their relatively high surface charge density, but the low surface charge density of silica spheres makes them easy to coagulate in solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1, first soak monodisperse silica pellets with a particle diameter of 150 nm in 30% hydrogen peroxide for 40 hours; take 3 grams of silica pellets soaked in hydrogen peroxide and ultrasonically disperse them in 150 ml of acetonitrile solution , then add succinic acid according to the mass ratio of silica pellets and succinic acid 1:1, carry out reflux heating reaction at 70°C for 25 hours, after the product is suction filtered, use absolute ethanol with a volume ratio of 1:1 Repeated washing and filtration with deionized water mixed solution, and vacuum drying at 130°C to obtain succinic acid-modified silica monodisperse beads; after dialysis and purification of succinic acid-modified silica monodisperse beads , ultrasonically dispersed in water, prepared into a suspension with a mass fraction of 20%, injecting the suspension into a 0.8mm thick sample cell, allowing it to stand and self-drain to form colloidal crystals.

Embodiment 2

[0008] Example 2, first soak monodisperse silica pellets with a particle size of 180nm in 30% hydrogen peroxide for 35 hours; take 1 g of silica pellets soaked in hydrogen peroxide and ultrasonically disperse them in 150ml of acetonitrile solution , then add succinic acid according to the mass ratio of silica pellets and succinic acid 1:3, carry out reflux heating reaction at 68°C for 28 hours, after the product is suction filtered, use absolute ethanol with a volume ratio of 1:1 Repeated washing and filtering with deionized water mixture, and vacuum drying at 110°C to obtain succinic acid-modified silica monodisperse beads; after dialysis and purification of succinic acid-modified silica monodisperse beads , ultrasonically disperse in water, prepare a suspension with a mass fraction of 5%, inject the suspension into a 0.5mm thick sample cell, let it stand and self-drain to form colloidal crystals.

Embodiment 3

[0009] Example 3, first soak the monodisperse silica pellets with a particle size of 230nm in 30% hydrogen peroxide for 20 hours; take 2 grams of the silica pellets soaked in hydrogen peroxide and ultrasonically disperse them in 150ml of acetonitrile solution , then add succinic acid according to the mass ratio of silica pellets and succinic acid 1:4, carry out reflux heating reaction at 75°C for 20 hours, after the product is suction filtered, use absolute ethanol with a volume ratio of 1:1 Repeated washing and filtering with deionized water mixture, and vacuum drying at 140°C to obtain succinic acid-modified silica monodisperse beads; after dialysis and purification of succinic acid-modified silica monodisperse beads , ultrasonically dispersed in water, prepared into a suspension with a mass fraction of 15%, injecting the suspension into a 1mm thick sample cell, allowing it to stand and self-drain to form colloidal crystals.

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Abstract

The invention discloses a preparing method of variable lattice constant silica colloid crystal, which comprises the following steps: immersing silica in the hydrogen dioxide solution to repair and increase surface hydroxyl group; diffusing disposed silica globule in the acetonitrile; adding certain quantity of succinic acid; proceeding flux heating reaction for 20-30 h at 65-75 deg.c; esterifying hydroxyl group of carboxyl acid group of one end of amber acid and silica globule surface; bonding chemical bond of succinic acid on the surface of silica globule to increase surface load density of silica globule and electrostatic repulsion; diffusing silica globule in the water through dialytic and purifying disposal to prepare 5-20 percent suspending liquid; injecting the suspending liquid in the 0.5-1 mm thick sample pool to stew and arrange automatically to form gel crystal; adjusting lattice constant of colloid crystal through changing silica globule quality percentage in the suspending liquid.

Description

technical field [0001] The invention relates to a preparation method of silica colloidal crystals, in particular to a preparation method of variable lattice constant silica colloidal crystals. Background technique [0002] In recent years, the study of photonic crystals has attracted more and more researchers' interest. Photonic crystal is an optical sub-wavelength periodic structure with dielectric function. When light is incident on the crystal, light of a certain frequency will be scattered by these periodic structures and cannot pass through, so that the transmission spectrum forms a certain width forbidden band. As an "optical semiconductor", photonic crystals have a unique function of adjusting the state of light propagation, and have very broad application prospects in the fields of optoelectronic integration, photon integration, and optical communication. [0003] Colloidal crystals are photonic crystals formed by the self-arrangement of monodisperse polystyrene or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B5/00C30B29/18
Inventor 王秀峰方俊程冰王烈松伍媛婷朱宛琳
Owner SHAANXI UNIV OF SCI & TECH
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