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Method for preparing photonic crystal hydrogel with temperature and NaCl sensitive reversible color-change performance

A technology of photonic crystals and hydrogels, which is applied in the field of preparation of color-changing hydrogels, can solve the problems of difficult preparation of photonic crystal hydrogels without defect states, difficult control of experimental conditions, cumbersome steps, etc., and achieve excellent optical properties, Gorgeous structural colors, simple and controllable effects

Active Publication Date: 2016-01-06
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this sensory photonic crystal hydrogel first requires interface assembly to prepare a monolayer polystyrene photonic crystal template. The method is complicated, the steps are cumbersome, and the experimental conditions are difficult to control. It is difficult to prepare photonic crystal hydrogels without defect states. glue

Method used

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  • Method for preparing photonic crystal hydrogel with temperature and NaCl sensitive reversible color-change performance
  • Method for preparing photonic crystal hydrogel with temperature and NaCl sensitive reversible color-change performance
  • Method for preparing photonic crystal hydrogel with temperature and NaCl sensitive reversible color-change performance

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Add 0.5g of isopropylacrylamide monomer, 0.005g of N,N'-methylenebisacrylamide, and 0.01g of ammonium persulfate into 1g of water, and mix uniformly to obtain the first solution; Adding paramagnetic carbon-coated Fe3O4 nanoparticles into the first solution, and ultrasonically dispersing them uniformly to obtain a mixed solution;

[0033] Put the above mixed solution in a 5mL small beaker, apply a uniform magnetic field of 500G under the beaker, then add 0.01g of tetramethylethylenediamine, mix quickly, and let it stand for 48 seconds to obtain a photonic crystal gel;

[0034] The photonic crystal gel is soaked in deionized water, and the water is changed every day until the gel reaches a swelling balance, and a photonic crystal hydrogel with reversible discoloration sensitive to temperature and salt is obtained.

[0035] Electron microscope scanning is carried out to described photonic crystal hydrogel structure, the result sees figure 1 , the results show that the pre...

Embodiment 2

[0043] Add 0.3g of isopropylacrylamide monomer, 0.005g of N,N'-methylenebisacrylamide, and 0.015g of potassium persulfate into 1g of ethylene glycol and mix uniformly to obtain the first solution; Superparamagnetic carbon-coated Fe3O4 nanoparticles are added to the first solution, and ultrasonically dispersed to obtain a mixed solution;

[0044] Put the above mixed solution in a 5mL small beaker, apply a uniform magnetic field of 700G under the beaker, then add 0.002g of tetramethylethylenediamine, mix quickly, and let it stand for 40 seconds to obtain a photonic crystal gel;

[0045] The photonic crystal gel is soaked in deionized water, and the water is changed every day until the gel reaches a swelling balance, and a photonic crystal hydrogel with reversible discoloration sensitive to temperature and salt is obtained.

[0046] The reversible color photonic crystal hydrogel is soaked in deionized water, heated to different temperatures for color observation, the results show...

Embodiment 3

[0051] Add 0.6g of isopropylacrylamide monomer, 0.02g of N,N'-methylenebisacrylamide, and 0.007g of sodium persulfate into a mixed solution of 1g of ethylene glycol and water, and mix uniformly to obtain the first solution; add 0.015 g particle size is 180nm superparamagnetic carbon-coated iron ferric oxide nanoparticles added to the first solution, ultrasonically dispersed evenly to obtain a mixed solution;

[0052] Put the above mixed solution in a 5mL small beaker, apply a uniform magnetic field of 1000G under the beaker, then add 0.012g of tetramethylethylenediamine, mix quickly, and let it stand for 30 seconds to obtain a photonic crystal gel;

[0053] The photonic crystal gel is soaked in deionized water, and the water is changed every day until the gel reaches a swelling balance, and a photonic crystal hydrogel with reversible discoloration sensitive to temperature and salt is obtained.

[0054] The reversible color photonic crystal hydrogel is soaked in deionized water...

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Abstract

The invention relates to a method for preparing photonic crystal hydrogel with temperature and NaCl sensitive reversible color-change performance. The method includes the steps that N-isopropylacrylamide monomers, N,N'-methylene-bis-acrylamide and persulphate are evenly stirred in solvents and evenly mixed; then super-paramagnetism carbon-wrapped ferroferric oxide nanometer particles are added, and an even mixed solution is obtained through ultrasonic dispersing; the mixed solution is placed into a permanent magnetic field with the constant strength, tetramethylethylenediamine is added, the mixture is rapidly mixed, magnetic particles are inducted by the magnetic field to assemble photonic crystal nanometer chains in the solution, standing reacting is carried out, and gel of poly isopropyl acrylamide loading the magnetic nanometer chains is obtained after polymerization is completed; the gel is finally soaked with deionized water to be sufficiently swelled, and the photonic crystal hydrogel with the temperature and NaCl sensitive color-change performance is obtained. The method is easy to operate, no special device is required, and the prepare gel is excellent in temperature and NaCl sensitive reversible color-change performance.

Description

technical field [0001] The invention relates to a preparation method of a color-changing hydrogel, in particular to a preparation method of a photonic crystal hydrogel with temperature and NaCl salt sensitive discoloration. Background technique [0002] Responsive hydrogels are a type of gels that respond to subtle changes in the external environment, such as temperature, ion concentration, pH, light, and chemicals. Responsive hydrogels have attracted extensive attention and research at home and abroad in recent years due to their potential applications in controlled drug release, sensors, wound dressings, and artificial muscles. The response behavior of the responsive hydrogel disclosed in the prior art is mainly reflected in the shrinkage or swelling of a single volume, which limits its application field. Therefore, integrating responsive hydrogels with other functional materials to prepare smart hybrid hydrogels has become a research hotspot. [0003] Photonic crystal r...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F222/38C08F2/44C08K9/10C08K3/22C08J3/075
Inventor 陈苏汪晓巧
Owner NANJING UNIV OF TECH
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