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A method for preparing colloidal magnetic response photonic crystals by polymer emulsification method

A technology of photonic crystals and polymers, applied in optics, optical components, instruments, etc., can solve the problems of long reaction time, emulsifier residue, difficult to obtain raw materials and equipment, etc., to achieve easy to obtain raw materials, easy to identify, and bright diffraction light Effect

Active Publication Date: 2018-09-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above preparation method may require the use of unavailable raw materials and equipment, or the introduction of high temperature and long reaction time in the preparation of colloidal magnetic response photonic crystals
In addition, the use of small molecule emulsifiers may also lead to residual emulsifiers in the product

Method used

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  • A method for preparing colloidal magnetic response photonic crystals by polymer emulsification method
  • A method for preparing colloidal magnetic response photonic crystals by polymer emulsification method
  • A method for preparing colloidal magnetic response photonic crystals by polymer emulsification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The amphiphilic random copolymer poly(methyl methacrylate-co-methacrylic acid) was prepared by solution radical polymerization. Weigh 0.24 mol of methyl methacrylate, 0.06 mol of methacrylic acid and 0.009 mol of azobisisobutyronitrile into a 250 mL round bottom flask, add 60 mL of 1,4-dioxane, shake slightly to dissolve them evenly. Nitrogen was passed through it for 15 minutes to remove oxygen, sealed, and stirred in an oil bath at 65°C for 24 hours. The product was precipitated with anhydrous ether and washed twice, and the precipitate was vacuum-dried at 50°C for 8 hours to obtain the amphiphilic random copolymer poly(methyl methacrylate -co- Methacrylate).

[0031] The solution of amphiphilic random copolymer was prepared by direct dissolution method. Weigh 5g of poly(methyl methacrylate- co -methacrylic acid) solid, add a small amount of water, and add dropwise with 1 mol / L sodium hydroxide solution until the polymer is just completely dissolved; adjust the p...

Embodiment 2

[0039] Preparation of amphiphilic random copolymer poly(styrene- co -Methacrylate). Weigh 0.06 mol of styrene, 0.04 mol of methacrylic acid, and 0.003 mol of azobisisobutyronitrile into a 100 mL round bottom flask, add 30 mL of 1,4-dioxane, and the rest of the implementation steps are the same as in Example 1.

[0040] The solution of amphiphilic random copolymer was prepared by direct dissolution method. Concrete steps are with embodiment 1.

[0041] Oleic acid modified ferric oxide magnetic nanoparticles were prepared by co-precipitation method. Concrete steps are with embodiment 1.

[0042] Colloidal magnetic response photonic crystals were prepared by polymer emulsification method. Weigh 100 mg of ferroferric oxide magnetic nanoparticles modified with oleic acid, add 4 mL of chloroform, and disperse in a water-bath ultrasonic cleaner with a frequency of 50 KHz for 15 s. The amphiphilic random copolymer aqueous solution was diluted with water to a mass concentration o...

Embodiment 3

[0045] Preparation of amphiphilic random copolymer poly(lauryl methacrylate- co -Methacrylate). Weigh 0.0078 mol of lauryl methacrylate, 0.0312 mol of methacrylic acid, and 0.0012 mol of azobisisobutyronitrile into a 100 mL round bottom flask, add 30 mL of 1,4-dioxane, and the rest of the implementation steps are the same as in the examples 1.

[0046] The solution of amphiphilic random copolymer was prepared by direct dissolution method. Concrete steps are with embodiment 1.

[0047] Oleic acid modified ferric oxide magnetic nanoparticles were prepared by co-precipitation method. Concrete steps are with embodiment 1.

[0048] Colloidal magnetic response photonic crystals were prepared by polymer emulsification method. Weigh 50 mg of ferroferric oxide magnetic nanoparticles modified with oleic acid, add 1 mL of n-hexane, and disperse in a water-bath ultrasonic cleaner with a frequency of 50 KHz for 10 s. The amphiphilic random copolymer aqueous solution was diluted with...

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Abstract

The invention discloses a method for preparing a colloidal magnetic response photonic crystal by a polymer emulsifying method, and belongs to the technical field of magnetic nano-material application. The method is implemented through four steps: 1, synthesizing an amphiphilic random copolymer, and dissolving the amphiphilic random copolymer in an alkaline aqueous solution and regulating the pH to be neutral; 2, preparing oleic acid-modified ferroferric oxide magnetic nano-particles by a chemical coprecipitation method; 3, dispersing the oleic acid-modified ferroferric oxide magnetic nano-particles in an organic solvent and mixing with an amphiphilic random copolymer aqueous solution, and performing ultrasonic emulsifying; 4, removing an organic solvent from an emulsion by evaporating under normal temperature and reduced temperature, collecting composite particles with a magnetic separating method, and washing the composition particles with water to obtain a polymer-coated colloidal magnetic response photonic crystal dispersing system. Diffracted light with different wavelengths can be obtained by irradiating the system through natural light in a variable magnetic field. The preparation method provided by the invention is simple, quick and easy to operate; raw materials are easily obtained and the cost is low.

Description

technical field [0001] The invention relates to a method for preparing colloidal magnetic response photonic crystals by a polymer emulsification method, and belongs to the technical field of magnetic nanomaterial applications. Background technique [0002] The so-called photonic crystal refers to an ordered structure formed by periodic arrangement of two or more materials with different refractive indices (dielectric constants) in space. There is a photonic band gap in photonic crystals, which can realize the selection of light wavelengths, and can be used in optical fields such as photonic crystal light-emitting diodes, photonic crystal filters, and photonic crystal color displays. [0003] Colloidal magnetically responsive photonic crystals belong to the family of photonic crystals, and their particle sizes are within the research range of colloidal science. Under the induction of an external magnetic field, the magnetic particles can reversibly and quickly complete the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/12C08L25/08C08L33/02C08K9/04C08K3/22C08F220/14C08F212/08C08F220/06C08F220/18G02B1/00
CPCC08F212/08C08F220/06C08F220/14C08K3/22C08K9/04C08K2003/2275C08K2201/011G02B1/005C08L33/12C08L25/08C08L33/02C08F220/1812
Inventor 曹玉华倪鑫炯由爱梅曹光群
Owner JIANGNAN UNIV
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