Magnetically responsive 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 unfavorable practical application, reflectivity loss, weak mechanical properties of hydrogel fibers, etc., and achieve convenient shaping and processing, high degree of processing freedom, good thixotropic effect

Active Publication Date: 2021-10-26
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Magnetically responsive color-changing photonic crystal ink for 3D printing and preparation method thereof
  • Magnetically responsive color-changing photonic crystal ink for 3D printing and preparation method thereof
  • Magnetically responsive 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, in particular to a magnetic response color changing photonic crystal ink for 3D printing and a preparation method thereof. The preparation method of the invention includes: preparing superparamagnetic colloidal particles, dispersing the superparamagnetic colloidal particles in a polar solvent to obtain a magnetic response color-changing photonic crystal solution; mixing the solution with a curable polymer precursor to emulsify , to obtain a magnetically responsive emulsion; adding a thixotropic agent or a resin enhancer to the emulsion to obtain a magnetically responsive color-changing photonic crystal ink. The excellent thixotropy of the ink makes it possible to fabricate magnetically responsive photonic crystal devices of any shape by 3D printing, which can still exhibit dynamic and reversible bright structural colors with the change of magnetic field strength after curing. The invention effectively improves the application convenience and degree of freedom of the magnetically responsive photonic crystal, and 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 Patents(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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