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Magnetic response photonic crystal anti-fake label and manufacturing method thereof

A photonic crystal and anti-counterfeiting label technology, which is applied to instruments, static indicators, etc., can solve problems such as unfavorable application and low anti-counterfeiting effect, and achieve the effect of low cost, easy operation, and large-scale promotion and use.

Inactive Publication Date: 2012-10-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the bright color properties of responsive photonic crystals, the responsive photonic crystals disclosed in the prior art have good properties and broad application space. The imitation of dye color makes its anti-counterfeiting effect lower, which is not conducive to its application

Method used

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  • Magnetic response photonic crystal anti-fake label and manufacturing method thereof
  • Magnetic response photonic crystal anti-fake label and manufacturing method thereof
  • Magnetic response photonic crystal anti-fake label and manufacturing method thereof

Examples

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Effect test

preparation example Construction

[0048] The invention provides a method for preparing a magnetic response photonic crystal anti-counterfeiting mark, which includes the following steps:

[0049] Mixing the polymerized monomer, the curing agent and the ethylene glycol solution containing carbon-coated superparamagnetic ferroferric oxide colloidal nanoparticles of different particle sizes to obtain a jelly;

[0050] The gel is placed in a plurality of patterns of the anti-counterfeiting mark pattern template, and the magnetic response photonic crystal anti-counterfeiting mark is obtained after the polymerization reaction. A single pattern in the pattern includes at least two kinds of carbon-coated super smooth with different particle sizes Magnetic ferroferric oxide colloidal nanoparticles.

[0051] In the present invention, firstly, ethylene glycol solution containing carbon-coated superparamagnetic ferroferric oxide colloidal nanoparticles of different particle diameters, polymerized monomer and curing agent are stir...

Embodiment 1

[0062] 0.2g of ferrocene was dissolved in 30mL of acetone, and after ultrasonic dispersion, 1.0mL of a 30% mass concentration of hydrogen peroxide aqueous solution was added dropwise to it, and after magnetic stirring was performed at a rotation speed of 1000r / min for 30min, a mixed solution was obtained; The mixed solution was transferred to a 40mL autoclave, sealed and heated to 210°C, and after holding for 72 hours, the reaction system was cooled to room temperature to obtain a black powder; the black powder was washed three times with acetone and ethanol, and then heated at 40°C. Dry in a vacuum oven for 6 hours to obtain a product.

[0063] In the present invention, the obtained product is subjected to transmission electron microscope scanning analysis, and the results are as follows figure 1 As shown, figure 1 This is the TEM image of the carbon-coated superparamagnetic ferroferric oxide colloidal nanoparticles obtained in Example 1 of the present invention. figure 1 It can ...

Embodiment 2

[0070] The ethylene glycol solution of carbon-coated superparamagnetic ferroferric oxide colloidal nanoparticles with a particle size of 125 nm and a particle size of 140 nm in Example 1 was mixed in equal volumes to obtain a mixed solution. Under the action of a magnetic field, the obtained mixed solution immediately appears diffraction phenomenon, and presents a bright color different from that before mixing.

[0071] Mix 0.5 mL of the obtained mixed solution with 2.0 g of polydimethylsiloxane monomer and 0.4 g of curing agent, and stir vigorously for 5 minutes until a uniform gel is formed. Then pour the obtained jelly into a pre-prepared template, and place the template in an oven at 60° C. for polymerization for 2 hours. After curing, a magnetic response photonic crystal anti-counterfeiting mark is obtained.

[0072] The present invention detects the reflection spectrum of the mixed solution, and the result is as follows Figure 7 As shown, Figure 7 Is the reflectance spect...

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Abstract

The invention provides a magnetic response photonic crystal anti-fake label and a manufacturing method thereof. The magnetic response photonic crystal anti-fake label provided by the invention comprises a plurality of patterns, wherein the patterns comprise polymer substrates and ethylene glycol micro droplets which contain carbon-coated superparamagnetism ferroferric oxide colloidal nanometer particles and are encapsulated in the polymer substrates; single pattern among the patterns at least comprises two kinds of carbon-coated superparamagnetism ferroferric oxide colloidal nanometer particles of different particle diameters. In the magnetic response photonic crystal anti-fake label provided by the invention, the carbon-coated superparamagnetism ferroferric oxide colloidal nanometer particles of different particle diameters are self-assembled respectively to acquire a multi-photon band gap structure under the action of magnetic fields, so that visible light of different wavelengths can be reflected and is superposed to acquire a new colour; and the color can not be copied by common pigment or dye color, has a good anti-fake effect and good color adjustability, and is beneficial to application.

Description

Technical field [0001] The invention relates to the technical field of functional photonic crystals, in particular to a magnetic response photonic crystal anti-counterfeiting mark and a preparation method thereof. Background technique [0002] Photonic crystal is a periodic dielectric material with a photonic band gap structure, which can effectively control the propagation direction of light, and has properties similar to electronic semiconductors. Since 1987, Yablonovitch (Yablonovitch E. Phys. Rev. Lett., 1987, 58: 2059 ~ 2061.) and John (John S. Phys. Rev. Lett., 1987, 58: 2486 ~ 2488.) have proposed photon After the crystal concept, the research of photonic crystals has received great attention and has been developed rapidly. Photonic crystals are also known as optical semiconductors. They are considered to be the material contacts of the photonic industry in the future and have broad application prospects in various optical devices, optical fiber communications, and photon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/02
Inventor 陈乾旺胡海波唐健
Owner UNIV OF SCI & TECH OF CHINA
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