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Temperature-sensitive photonic crystal gel with wide threshold and high sensitivity and its preparation method

A photonic crystal and gel technology, applied in the field of temperature-sensitive photonic crystal gel and its preparation, can solve the problems of low response sensitivity and narrow response threshold, and achieve a simple preparation process, a short preparation period, and easy mass production. Effect

Active Publication Date: 2021-11-30
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the existing poly(N-isopropylacrylamide) temperature-sensitive photonic crystal gel based on the one-dimensional photonic crystal structure of magnetic nanoparticles has narrow response threshold and low response sensitivity, it provides a wide range Threshold and highly sensitive temperature-sensitive photonic crystal gel and preparation method to widen the response threshold of temperature-sensitive photonic crystal gel and improve its response sensitivity

Method used

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  • Temperature-sensitive photonic crystal gel with wide threshold and high sensitivity and its preparation method
  • Temperature-sensitive photonic crystal gel with wide threshold and high sensitivity and its preparation method
  • Temperature-sensitive photonic crystal gel with wide threshold and high sensitivity and its preparation method

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Embodiment 1

[0039] In the present embodiment, two kinds of superparamagnetic nanoparticles Fe with different particle sizes were prepared. 3 o 4 @PVP, the steps are as follows:

[0040] (1) Dissolve 0.243g of glucose in 30mL of ethylene glycol at room temperature, then heat the resulting solution in an oil bath at 100°C, add 3.33g of polyvinylpyrrolidone (PVP) while stirring, and continue stirring until the solution is clear and transparent Finally, take it out from the oil bath and cool to room temperature, then add 0.677g of crushed ferric chloride hexahydrate into the solution (that is, the molar ratio of glucose to ferric chloride hexahydrate is 0.54), stir vigorously for 30min to completely dissolve the solid , then add 3.28g of anhydrous sodium acetate to the solution, continue to stir vigorously for 40min to completely dissolve the solid, transfer the resulting mixed reaction solution to the reactor, react at 200°C for 10h, and finally, use secondary pure water and anhydrous Afte...

Embodiment 2

[0054] In this embodiment, the first and second superparamagnetic nanoparticles prepared in Example 1 were used to prepare photonic crystal gels, and the prepared Fe containing particles with a particle size of 164nm 3 o 4 The photonic crystal gel of @PVP is named PHT-1, and the prepared Fe containing particle size is 198nm 3 o 4 The photonic crystal gel of @PVP is named PHT-2, and the steps are as follows:

[0055] (1) Dissolve monomer NIPAM, cross-linking agent four-arm polyethylene glycol acrylamide and photoinitiator IRG-184 in ethylene glycol, then add the first or second superparamagnetic nanoparticles, fully disperse , to form a gel prepolymer.

[0056] For the gel prepolymerization solution of PHT-1, the concentration of the first superparamagnetic nanoparticles is 8mg / mL, the concentration of the four-arm polyethylene glycol acrylamide of the crosslinking agent is 0.012mol / L, and the concentration of the monomer NIPAM The concentration is 3.6mol / L, and the concent...

Embodiment 3

[0062] In this example, photonic crystal gels with different contents of superparamagnetic nanoparticles were prepared, and the photonic crystal gel with a superparamagnetic nanoparticle concentration of 4 mg / mL in the gel prepolymerization solution was named PHT-3, and the gel prepolymerization The photonic crystal gel with superparamagnetic nanoparticle concentration of 12 mg / mL in the liquid is named PHT-4, and the steps are as follows:

[0063] (1) Dissolve monomer NIPAM, cross-linking agent four-arm polyethylene glycol acrylamide and photoinitiator IRG-184 in ethylene glycol, then add the first superparamagnetic nanoparticles, fully disperse, and form a gel Pre-poly fluid.

[0064] For the gel prepolymerization solution of PHT-3, the concentration of the first superparamagnetic nanoparticles is 4mg / mL, the concentration of the four-arm polyethylene glycol acrylamide of the crosslinking agent is 0.012mol / L, and the concentration of the monomer NIPAM The concentration is 3...

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Abstract

The present invention provides a temperature-sensitive photonic crystal gel with wide threshold and high sensitivity. The temperature-sensitive photonic crystal gel is composed of poly(N-isopropylacrylamide) hydrogel and three-dimensional Composed of superparamagnetic nanoparticles in the polymer network structure, the three-dimensional polymer network structure of the hydrogel is cross-linked and polymerized by the monomer N-isopropylacrylamide and the cross-linking agent four-armed polyethylene glycol acrylamide A uniform cross-linked structure is formed, and the superparamagnetic nanoparticles are arranged in a three-dimensional polymer network structure to form several one-dimensional oriented chain structures; the temperature-sensitive photonic crystal gel can When the temperature is detected, the structural color of the temperature-sensitive photonic crystal gel corresponds to a wavelength range of 658-464 nm. The invention can broaden the response threshold of the existing temperature-sensitive photonic crystal gel and improve the response sensitivity.

Description

technical field [0001] The invention relates to the field of photonic crystal materials, and relates to a temperature-sensitive photonic crystal gel with wide threshold and high sensitivity based on a one-dimensional photonic crystal structure and a preparation method thereof. Background technique [0002] Temperature is a common and important source of external stimuli. Temperature-sensitive photonic crystal gels have been widely studied because they can directly detect different temperatures in the outside world through color changes recognizable by the naked eye. Poly(N-isopropylacrylamide) (PNIPAM), as the first discovered temperature-responsive polymer, has been widely used in temperature-responsive photonic crystal condensation systems. In the face of changes in the external temperature, the volume of the PNIPAM photonic crystal gel will swell or shrink, causing the internal lattice spacing of the gel to increase or shrink, resulting in a change in the position of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L33/24C08K9/10C08K3/22
CPCC08J3/075C08J2333/24C08K9/10C08K2003/2275C08K2201/01
Inventor 谢锐贾智涵褚良银邱月巨晓洁汪伟刘壮
Owner SICHUAN UNIV
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