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Magnetic response color-changing photonic crystal ink for 3D printing and preparation method thereof

A photonic crystal and 3D printing technology, applied in the direction of additive processing, etc., can solve the problems of weak mechanical properties of hydrogel fibers, loss of reflectivity, unfavorable practical applications, etc.

Active Publication Date: 2021-05-18
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Journal of the American Chemical Society has reported a method of combining magnetic nano-microspheres with hydrogel microspheres. By controlling the rotation of polyethylene glycol diacrylate microspheres with magnetically responsive photonic crystals fixed inside, the dynamic Optical structural color conversion under magnetic field (J.AM. CHEM. SOC. 2009, 131, 15687-15694), but its structural color change can only be observed under a microscope
Chinese patent CN 107988657 proposes a method of combining magnetic colloidal microsphere dispersion with sodium alginate hydrogel to prepare magnetic field-responsive photonic crystal fibers in capillaries, but its reflectivity is the same as that of the original magnetic-responsive photonic crystal dispersion Compared with the larger loss, the weaker mechanical properties of the thinner hydrogel fibers are not conducive to practical applications

Method used

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  • Magnetic response color-changing photonic crystal ink for 3D printing and preparation method thereof
  • Magnetic response color-changing photonic crystal ink for 3D printing and preparation method thereof
  • Magnetic response color-changing photonic crystal ink for 3D printing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, synthesizing monodisperse ferroferric oxide magnetic nanocluster

[0031]Measure 40 ml of anhydrous ethylene glycol into a 150 mL Erlenmeyer flask, and add 0.65 g of anhydrous ferric chloride, 3 g of anhydrous sodium acetate, 1.5 g of poly(4-styrenesulfonic acid-copolymerization-malay Acid) sodium salt (PSSMA) and 400 μL of distilled water were fully dispersed into a homogeneous solution by ultrasonication, stirring or heating, then 0.6 g of sodium hydroxide was added, and stirring was continued for 1 hour to dissolve. The above solution was transferred to a 50 ml polytetrafluoroethylene liner, sealed in a stainless steel reaction kettle, and placed in a constant temperature oven at 190°C for a heating reaction for 9 hours. After the reaction, it is separated by magnetic adsorption, and the product is washed with ethanol two to three times, and finally the product is dispersed in 15 ml of distilled water, which is the aqueous dispersion of ferric iron tetr...

Embodiment 2

[0032] Example 2, Synthesis of Monodisperse Ferroferric Oxide Magnetic Nanoclusters

[0033] Measure 40 ml of anhydrous ethylene glycol into a 150 mL Erlenmeyer flask, and add 0.65 g of anhydrous ferric chloride, 3 g of anhydrous sodium acetate, 1.5 g of poly(4-styrenesulfonic acid-copolymerization-malay Acid) sodium salt (PSSMA) and 300 μL of distilled water were fully dispersed into a homogeneous solution by ultrasonication, stirring or heating, then 0.6 g of sodium hydroxide was added, and stirring was continued for 1 hour to dissolve. The above solution was transferred to a 50 ml polytetrafluoroethylene liner, sealed in a stainless steel reaction kettle, and placed in a constant temperature oven at 190°C for a heating reaction for 9 hours. After the reaction, it was separated by magnetic adsorption, and the product was washed with ethanol two to three times, and finally the product was dispersed into 15 ml of distilled water, which was the aqueous dispersion of ferric iron...

Embodiment 3

[0034] Example 3, preparation of photonic crystal ink with magnetic response color change

[0035] Take 1ml of the above-mentioned aqueous dispersion of ferroferric oxide magnetic nanoclusters (Example 1), separate by strong magnetic adsorption, absorb the water, and re-disperse in 1ml of ethylene glycol by ultrasonic. The silicone rubber precursor was obtained by stirring and mixing with polydimethylsiloxane (PDMS) prepolymer 2 g and crosslinker 0.2 g. Add 2 drops (about 0.04 g) of ethoxylated silicone surfactant and 1 ml of the ethylene glycol dispersion to the precursor, stir well until the mixture is emulsified to a viscous state, and put 0.15 g of hydrophobic fumed nano-silica Fully mixed with the emulsion, it is the photonic crystal ink with magnetic response color change. The ink can exhibit structural colors similar to its aqueous dispersion under a magnetic field, and can be directly loaded into the barrel of a commercial 3D printer for extrusion printing.

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Abstract

The invention belongs to the technical field of photonic crystal materials, and particularly relates to magnetic response color-changing photonic crystal ink for 3D printing and a preparation method thereof. The preparation method comprises the following steps: preparing superparamagnetic colloidal particles, and dispersing the superparamagnetic colloidal particles in a polar solvent to obtain a magnetic response color-changing photonic crystal solution; mixing and emulsifying the solution and a curable polymer precursor to obtain a magnetic response emulsion; and adding a thixotropic agent or a resin reinforcing agent into the emulsion to obtain the magnetic response color-changing photonic crystal ink. Due to the excellent thixotropy of the ink, magnetic response photonic crystal devices in any shapes can be manufactured in a 3D printing mode, and the devices can still show dynamic and reversible bright structural colors along with the change of the intensity of the magnetic field after being cured. The application convenience and freedom degree of the magnetic response type photonic crystal are effectively improved, and the magnetic response type photonic crystal has huge application prospects in the fields of anti-counterfeiting, information storage, magnetic field sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of photonic crystal materials, and in particular relates to a magnetic response color-changing photonic crystal ink for 3D printing and a preparation method thereof. Background technique [0002] Photonic crystals are a class of materials with a periodic dielectric constant structure, which can modulate the propagation of specific wavelength light by changing the physical structure and refractive properties of the material. Among them, the photonic bandgap structure of the stimuli-responsive photonic crystal can change with the change of the external environment (such as steam, temperature, strain, pH and electromagnetic field). By modulating its diffraction wavelength in the visible light wavelength range, it can be intuitively The reflective specific structural color has great application prospects in many fields such as chemical sensing, biosensing, anti-counterfeiting marking and encrypted storage. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/22C08K3/36B33Y70/10
CPCB33Y70/10C08K3/22C08K3/36C08K2003/2275C08K2201/011C08L83/04
Inventor 汪长春方怡权
Owner FUDAN UNIV
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