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Method for self-assembling preparing colloidal photonic crystals and improving mechanical stability

A colloidal photonic crystal and colloidal crystal technology, which is applied in crystal growth, microsphere preparation, microcapsule preparation, etc., can solve the problems that colloidal photonic crystal films cannot meet the requirements, limit the application of three-dimensional colloidal photonic crystal films, and have limited mechanical stability. , to achieve the effect of improving the quality and scope of application, increasing mechanical stability, and reducing friction

Inactive Publication Date: 2008-10-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-dimensional colloidal photonic crystals prepared by these methods are basically membrane structures
In practical applications, there are two main reasons that limit the application of 3D colloidal photonic crystal films
First, some applications such as biomolecular carriers prefer a spherical shape, some anisotropic optical devices require a ring shape, etc., and thin-film colloidal photonic crystal films cannot meet the requirements
Second, the preparation of colloidal crystals through the self-assembly method of colloidal particles must be supported by a solid-phase template or substrate. The colloidal crystals are separated from the substrate or the template and are difficult to self-support or maintain their original shape. The van der Waals force is connected together, so its mechanical stability is limited, and it is easy to be damaged at the crystal defect or under the action of external force in the self-supporting state of the template.

Method used

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  • Method for self-assembling preparing colloidal photonic crystals and improving mechanical stability
  • Method for self-assembling preparing colloidal photonic crystals and improving mechanical stability
  • Method for self-assembling preparing colloidal photonic crystals and improving mechanical stability

Examples

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Effect test

Embodiment 1

[0022] Example 1: Preparation of silica colloidal photonic crystal microspheres:

[0023] 1. Choose an aqueous solution of silica colloidal particles with a particle size of 200 nanometers, with a particle concentration of 10%;

[0024] 2. Disperse the colloidal silica solution into silicone oil through the droplet generator to form droplets of the colloidal silica solution;

[0025] 3. Dry the droplets of the colloidal silica solution at 90°C to evaporate the water in them. The treatment time is 8 hours to obtain colloidal silica photonic crystal microspheres;

[0026] 4. Wash off the silicone oil on the surface of the colloidal photonic crystal microspheres, and then treat it at 1000°C for 2 hours to obtain colloidal photonic crystal microspheres with high mechanical stability.

Embodiment 2

[0027] Example 2: Preparation of polystyrene colloidal photonic crystal microspheres:

[0028] 1. Choose an aqueous solution of polystyrene colloidal particles with a particle size of 260 nm, with a particle concentration of 30%;

[0029]2. Disperse the polystyrene colloidal solution into the silicone oil through the droplet generator to form droplets of the polystyrene colloidal solution;

[0030] 3. Dry the droplets of the polystyrene colloidal solution at 60°C to evaporate the water in the droplets. The treatment time is 24 hours to obtain polystyrene colloidal photonic crystal microspheres;

[0031] 4. Wash off the silicone oil on the surface of the colloidal photonic crystal microspheres, and then treat it at 110°C for 2 hours to obtain colloidal photonic crystal microspheres with high mechanical stability.

Embodiment 3

[0032] Example 3: Preparation of polymethyl methacrylate colloidal photonic crystal microspheres:

[0033] 1. Choose an aqueous solution of polymethyl methacrylate colloidal particles with a particle size of 240 nanometers, with a particle concentration of 24%;

[0034] 2. Disperse the polymethyl methacrylate colloidal solution into silicone oil through the droplet generator to form droplets of the polymethyl methacrylate colloidal solution;

[0035] 3. Dry the droplets of the polymethyl methacrylate colloidal solution at 80°C to evaporate the water in the droplets. The treatment time is 12 hours to obtain polymethyl methacrylate colloidal photonic crystal microspheres;

[0036] 4. Wash off the silicone oil on the surface of the colloidal photonic crystal microspheres, and then treat it at 110°C for 2 hours to obtain colloidal photonic crystal microspheres with high mechanical stability.

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Abstract

Disclosed is a self-assembly and preparation device of colloidal photonic crystals and the method thereof to improve the mechanical stability; the colloidal particle solution is distributed to a continuous phase and in the formation of colloidal solution droplets. Through the evaporation of the solution in the droplet, the colloidal particle in the solution is self-assembled to become the colloidal photonic crystal while the droplet is taken as a template. For the mechanical stability of the photonic crystal, the mutual cementation of the colloidal particles inside a crystal is greatly enhanced through the heat treatment. The three-dimensional colloidal photonic crystals with high mechanical stability and prepared through such a method has a potential value in the aspects of size exclusion chromatography, enzyme or zymophore, adsorption medium, bio-molecule detection carrier, filter, light switches, photonic paper and so on.

Description

Technical field [0001] The invention relates to a method for preparing three-dimensional colloidal photonic crystals through colloidal self-assembly using liquid droplets as templates and improving the mechanical stability of the three-dimensional colloidal photonic crystals. Background technique [0002] Colloidal crystals are a class of substances with a three-dimensional ordered structure formed by monodisperse micron or submicron inorganic or organic particles (also called colloidal particles). Since the long-range orderly arrangement of colloidal particles creates a photonic band gap in colloidal photonic crystals, it is also called colloidal photonic crystals. The three-dimensional ordered structure of colloidal photonic crystals has a repetition period on the order of micrometers and sub-micrometers. Visible light (400-700nm) can cause Bragg diffraction in it. The long-range orderly arrangement of the colloidal particles makes the colloidal photonic crystals have character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B5/00B01J13/02
Inventor 赵祥伟赵远锦扈靖赵文举顾忠泽
Owner SOUTHEAST UNIV
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