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A responsive photonic crystal film with a wide temperature-induced range and its preparation method

A magnetic photonic crystal and photonic crystal technology, applied in the direction of coating, etc., can solve the problems of low saturation, easy to be changed, color loss, etc., and achieve the effect of high saturation and good order

Active Publication Date: 2022-07-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel obtained by directly immobilizing the ordered micro-nano structure formed by monodisperse colloidal nanoparticles on the gel matrix preparation method, the change of the lattice spacing is synchronized with the deformation of the hydrogel, which is easy to be changed, so that In a very short temperature range, the color change range spans the entire visible light, even red shift / blue shift to infrared / ultraviolet region and lose color
In addition, when the volume of the gel senses external stimuli to change, the ordered structure is easily destroyed, and the saturation of the membrane is not high.
These problems, such as low saturation and difficult to adjust the color, also make this kind of photonic crystal hydrogel have certain limitations in the application of sensing and self-adaptive camouflage materials.

Method used

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  • A responsive photonic crystal film with a wide temperature-induced range and its preparation method
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  • A responsive photonic crystal film with a wide temperature-induced range and its preparation method

Examples

Experimental program
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Embodiment 1

[0031] (1) Fe 3 O 4@PVP colloidal nanoparticles (particle size of 160 nm) are dispersed into 2-hydroxyethyl methacrylate (HEMA), acrylic acid (AA), crosslinker ethylene glycol dimethacrylate (EGDMA), photoinitiated A mixed solution was obtained in a solution composed of the agent 2-hydroxy-2-methyl-1-phenylacetone (HMPP), ethylene glycol (EG) and water. The particle concentration was 0.8 g / mL, the total concentration of HEMA and AA was 0.05 g / mL, the amount of HMPP was 2% of the total mass of HEMA and AA, the mass of EGDMA was 1% of the total mass of HEMA and AA, and the amount of HEMA and AA was 1%. The molar ratio is 1:1, and the volume ratio of EG and water is 6:1.

[0032] (2) The uniformly dispersed mixed solution is placed under a magnetic field of 250Gs, and cured with an ultraviolet lamp. The curing time is 3min. After the reaction is completed, ethanol is added, and sedimentation is carried out under the magnetic field for washing to obtain a magnetic photonic cryst...

Embodiment 2

[0038] (1) Fe 3 O 4 @PVP colloidal nanoparticles (particle size of 160 nm) are dispersed into 2-hydroxyethyl methacrylate (HEMA), acrylic acid (AA), crosslinker ethylene glycol dimethacrylate (EGDMA), photoinitiated A mixed solution was obtained in a solution composed of the agent 2-hydroxy-2-methyl-1-phenylacetone (HMPP), ethylene glycol (EG) and water. The particle concentration was 0.8 g / mL, the total concentration of HEMA and AA was 0.05 g / mL, the amount of HMPP was 2% of the total mass of HEMA and AA, the mass of EGDMA was 3% of the total mass of HEMA and AA, and the amount of HEMA and AA was 3%. The molar ratio is 1:1, and the volume ratio of EG and water is 6:1.

[0039] (2) The uniformly dispersed mixed solution is placed under a magnetic field of 250Gs, and cured with an ultraviolet lamp. The curing time is 3min. After the reaction is completed, ethanol is added, and sedimentation is carried out under the magnetic field for washing to obtain a magnetic photonic crys...

Embodiment 3

[0045] (1) Fe 3 O 4 @PVP colloidal nanoparticles (particle size of 80 nm) were dispersed into a mixture of 2-hydroxyethyl methacrylate (HEMA), acrylic acid (AA), crosslinker ethylene glycol dimethacrylate (EGDMA), photoinitiated A mixed solution is formed in a solution of the agent 2-hydroxy-2-methyl-1-phenylacetone (HMPP), ethylene glycol (EG) and water. The particle concentration is 0.4 g / mL, the concentration of HEMA-co-AA is 0.100 g / mL, the mass of HMPP is 1% of the mass of monomer HEMA-co-AA, and the mass of EGDMA is 1% of the mass of monomer HEMA-co-AA 6%, the molar ratio of HEMA to AA is 1:1, and the volume ratio of EG to water is 6:1.

[0046] (2) The uniformly dispersed mixed solution is placed under a magnetic field of 150Gs, and cured with an ultraviolet lamp. The curing time is 3 min. After the reaction is completed, ethanol is added, and sedimentation is carried out under the magnetic field for washing to obtain elastic magnetic photonic crystal elastic nanomete...

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Abstract

The invention relates to the field of display materials, in particular to a responsive photonic crystal film with a wide temperature induction range and a preparation method thereof, including a substrate and a temperature-sensitive responsive photonic crystal gel film bound to the substrate, the temperature-sensitive responsive photonic crystal gel film. The responsive photonic crystal gel film is composed of a thermosensitive responsive gel matrix and elastic nano-chains of magnetic photonic crystals fixed in it. In the photonic crystal thin film of the present invention, the color changes in two color systems as the temperature changes. In the temperature-induced range, its color is basically unchanged; after the induction range, with the increase of temperature, the photonic band gap shifts blue, and its color changes to another color system, until the volume phase transition occurs, and the color disappears. In the preparation method of the invention, the magnetic photonic nano-elastic chains are dispersed in the temperature-sensitive responsive gel prepolymer solution, coated on the surface of the substrate, combined with the magnetic orientation technology and the curing reaction to obtain a substrate-bound gel film, and the production cycle is short , the method is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of display material preparation, in particular to a responsive photonic crystal thin film with a wide temperature induction range and a preparation method thereof. Background technique [0002] The photonic crystal film based on the smart responsive hydrogel is to fix the ordered micro-nano structure formed by monodisperse colloidal nanoparticles in the smart responsive hydrogel, and use the hydrogel's perception of the external environment to make the photonic crystal lattice The spacing and refractive index are changed, so that the response signal is converted into a color signal visible to the naked eye, which has a wide range of applications in the fields of sensing, detection, and anti-counterfeiting. For example, "American Chemical Society - Applied Materials and Interfaces" (ACS Appl.Mater.Interfaces, 2017, Vol. 9, p. 27927) immobilized PS nanoparticles in PNIPAM films, using the deformation of the hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/00C03C17/32C09D4/02C09D4/06C09D7/62C08J3/075C08L51/00C08K9/10C08K3/22C08F265/04C08F265/02C08F220/54C08F220/58C08F222/38
CPCC03C17/009C03C17/32C09D4/06C09D7/62C09D7/68C08J3/075C08F265/04C08F265/02C08J2351/00C08K9/10C08K2003/2275C08K2201/005C08K2201/011C08F220/54C08F220/58C08F222/385
Inventor 马会茹闫鹤轩李刚陈继涛罗巍官建国
Owner WUHAN UNIV OF TECH