Method for preparing magnetic induction assembled colloidal photonic crystal with mini-emulsion polymerization method

A mini-emulsion polymerization and photonic crystal technology, which is applied in the field of functional photonic crystal materials to achieve the effects of mild reaction conditions, widened preparation routes and simple operation procedures

Inactive Publication Date: 2016-07-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing methods for preparing photonic crystals, and provide a method for preparing magnetically induced assembly colloidal photonic crystals by miniemulsion polymerization

Method used

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  • Method for preparing magnetic induction assembled colloidal photonic crystal with mini-emulsion polymerization method
  • Method for preparing magnetic induction assembled colloidal photonic crystal with mini-emulsion polymerization method
  • Method for preparing magnetic induction assembled colloidal photonic crystal with mini-emulsion polymerization method

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Co-precipitation method to prepare oleic acid-modified ferric oxide magnetic nanoparticles: add 0.01mol ferric chloride and 0.01mol ferrous chloride to 150mL ultrapure water that has been treated with nitrogen gas to remove oxygen, and ultrasonically dissolve at 50-60KHz , to obtain a mixed solution. The resulting mixed solution was transferred to a 250 mL three-necked flask, and placed in a 60°C oil bath. Add 20 mL of ammonia water and 0.5 g of oleic acid in sequence, pass nitrogen to remove oxygen throughout the reaction, and react for 0.5 h. After the reaction, a magnet was placed at the bottom of the flask to absorb the particles. The collected particles were washed to neutral with deionized water, and dried in a vacuum oven at 40° C. to obtain oleic acid-modified ferroferric oxide magnetic nanoparticles.

[0027] (2) Preparation and assembly of polymer-coated magnetic nanoparticles:

[0028] a. Preparation of miniemulsion A: Weigh 0.5 g of oleic acid-modifie...

Embodiment 2

[0035] (1) Co-precipitation method to prepare oleic acid-modified iron ferric oxide magnetic nanoparticles: add 0.01mol ferric chloride and 0.01mol ferrous sulfate to 120mL ultrapure water that has been treated with nitrogen to remove oxygen, and ultrasonically dissolve at 50-60KHz. A mixed solution was obtained. The resulting mixed solution was transferred to a 250 mL three-necked flask, and placed in an oil bath at 100°C. Add 30 mL of ammonia water and 1 g of oleic acid in sequence, pass nitrogen to remove oxygen throughout the reaction, and react for 2 hours. After the reaction, a magnet was placed at the bottom of the flask to absorb the particles. The collected particles were washed with deionized water until neutral, and dried in a vacuum oven at 50° C. to obtain oleic acid-modified ferroferric oxide magnetic nanoparticles.

[0036] (2) Preparation and assembly of polymer-coated magnetic nanoparticles:

[0037] a. Preparation of miniemulsion A: Weigh 1 g of oleic acid...

Embodiment 3

[0042] (1) Co-precipitation method to prepare oleic acid-modified iron ferric oxide magnetic nanoparticles: add 0.01mol ferric chloride and 0.01mol ferrous sulfate to 90mL ultrapure water that has been treated with nitrogen to remove oxygen, and ultrasonically dissolve at 50-60KHz. A mixed solution was obtained. The resulting mixed solution was transferred to a 250 mL three-necked flask, and placed in an 80°C oil bath. Add 10 mL of ammonia water and 0.1 g of oleic acid in sequence, pass nitrogen to remove oxygen during the whole reaction, and react for 1 h. After the reaction, a magnet was placed at the bottom of the flask to absorb the particles. The collected particles were washed with deionized water until neutral, and dried in a vacuum oven at 45° C. to obtain oleic acid-modified ferroferric oxide magnetic nanoparticles.

[0043] (2) Preparation and assembly of polymer-coated magnetic nanoparticles:

[0044] a. Preparation of miniemulsion A: Weigh 0.1 g of oleic acid-mo...

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Abstract

The invention provides a method for preparing a magnetic induction assembled colloidal photonic crystal with a mini-emulsion polymerization method and belongs to the technical field of functional photonic crystal materials. The method comprises the following steps: firstly, preparing ferriferrous oxide magnetic nano-particles modified by oleic acid through adopting a co-precipitation method; then, preparing polymer cladded magnetic nano-particles through three steps including pre-emulsification, fine emulsification and polymerization of the mini-emulsion polymerization method; finally, carrying out magnetic field induction assembling to obtain the colloidal photonic crystal. With the adoption of the method, a traditional method for assembling regular micro-spheres with the uniform grain diameter to form the photonic crystal is broken through and a preparation way of the photonic crystal is expanded; the preparation method provided by the invention is simple in operation flow, moderate in reaction conditions and low in cost. The assembling of the photonic crystal in the preparation method provided by the invention has the advantages of rapid speed, reversibility and simplicity; the photonic crystal has a very wide application prospect in a lot of application fields including decorative materials, coatings, thin films, sensing and the like.

Description

technical field [0001] The invention relates to a method for preparing magnetically induced assembled colloidal photonic crystals by miniemulsion polymerization, and belongs to the technical field of functional photonic crystal materials. Background technique [0002] Photonic crystals are artificial microstructures formed by periodic arrangements of media with different refractive indices, and have received extensive attention in the fields of physics, chemistry, electronics, and optics. Responsive photonic crystal refers to a new type of intelligent material with bandgap structure that can respond to different external environmental changes. The preparation methods of photonic crystals can be mainly divided into two categories: "top-down" method and "bottom-up" method. The "top-down" method usually uses traditional micro-nanofabrication methods, such as photolithography and etching techniques, to directly fabricate photonic crystal structures with designed dimensions and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F220/14C08F220/06C08F2/26C08F2/28C08F2/44C08K9/04C08K3/22
CPCC08F2/26C08F2/28C08F2/44C08F222/1006C08F222/102C08F222/103C08K3/22C08K9/04C08F220/06C08F220/14
Inventor 曹玉华由爱梅倪鑫炯曹光群
Owner JIANGNAN UNIV
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