Preparation and application of photonic crystal material with responsive invisible pattern

A photonic crystal and responsive technology, which is applied in the field of nanomaterials and functional polymer materials, can solve the problems of poor mechanical properties of patterns, swelling of responsiveness of pattern areas or poor tensile properties, and inability to develop colors.

Active Publication Date: 2021-07-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing encryption strategies have many limitations: for example, the "invisible" pattern introduced by cross-linking will lead to poor responsiveness (such as swelling or stretching properties) of the patterned area, and the mechanical properties of the pattern after multiple responses It will become worse, making the color pattern and background distinction low or even unable to develop color
In addition, the responsive patterns prepared by traditional methods can only respond to a single stimulus, and only one modification can be performed on the pattern area (responsive area) or the background area (non-responsive area), and the modification of the other area will destroy Chemical properties of the original area

Method used

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  • Preparation and application of photonic crystal material with responsive invisible pattern
  • Preparation and application of photonic crystal material with responsive invisible pattern
  • Preparation and application of photonic crystal material with responsive invisible pattern

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 Preparation of hollow silica photonic crystal

[0053] (1) Preparation of polystyrene@silica colloid:

[0054] Add 0.6g styrene, 0.9g polyvinylpyrrolidone, 0.13g 2,2'-azobisisobutylamidine dihydrochloride and 300g water into a 500mL three-necked flask, and react at 70°C for 24h. Purified by centrifugal washing to finally obtain polystyrene microspheres with a diameter of 205 nm;

[0055] Next, polystyrene@silica microspheres were prepared: 0.6 g of polystyrene microspheres were dispersed in 120 mL of ethanol. Then 3.1 mL of tetraethylorthosilicate and 8 mL of aqueous ammonia were added to the diluted dispersion under magnetic stirring. Reaction at 50°C for 3h. Purified by centrifugal washing, the final polystyrene@silica colloid with a diameter of 245 nm was obtained.

[0056] Finally, by vertically depositing polystyrene@silica colloidal photonic crystals on the substrate: place the clean substrate vertically in a polystyrene@silica colloidal suspensio...

Embodiment 2

[0062] Example 2 Hollow silica photonic crystal material with responsive invisible pattern

[0063] (1) Preparation of olefin-modified hollow silica photonic crystals:

[0064] Immerse the hollow silica photonic crystal in 30 mL of absolute ethanol. Subsequently, 1.5 mL of γ-methacryloxypropyltrimethoxysilane and 3.0 mL of ammonia water were added to the above solution at a stirring speed of 1100 rpm. The reaction was carried out under continuous stirring at room temperature for 6 h. Then the resulting film was completely washed with ethanol to obtain olefin-modified hollow silica photonic crystals.

[0065] It should be noted that, under the same conditions, when the amount of γ-methacryloxypropyltrimethoxysilane was replaced by 3.0mL, 4.5mL and 6.0mL, the olefin-modified hollow bismuth Silica photonic crystals; under the same conditions, when the amount of ammonia added was replaced by 1.5mL, 4.5mL and 6.0mL, olefin-modified hollow silica photonic crystals could be succes...

Embodiment 3

[0069] Embodiment 3 Water vapor appearance detection of responsive invisible pattern

[0070] In the obtained thiol-modified hollow silica photonic crystal, the olefin modification area (background area) and the cysteamine hydrochloride modification area (pattern area) that have not introduced mercapto groups in the obtained mercapto-modified hollow silica photonic crystal) are placed in a dynamic environment where the relative humidity is 80% RH. The reflectance spectrum was measured under humidity. After 1 second, there was no obvious change in the reflectance spectrum of the background area, but the maximum reflection wavelength of the pattern area was significantly red-shifted (51nm), such as figure 2 . It can be seen that the invisible pattern of the modified hollow silica photonic crystal has water vapor responsiveness.

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Abstract

The invention discloses preparation and application of a photonic crystal material with a responsive invisible pattern, and belongs to the technical field of nano materials and functional polymer materials. A hollow silicon dioxide photonic crystal is prepared by taking polystyrene microspheres as a template, and then areas with different hydrophilicity and hydrophobicity are selectively constructed on the hollow silicon dioxide photonic crystal through a Michael addition reaction, so that an invisible pattern capable of selectively responding to water vapor is formed. The prepared modified hollow silicon dioxide photonic crystal material with an invisible pattern can be used for moisture detection and other solvent detection, can display obvious patterns with different colors within 1 second under the action of dynamic moisture, has long-term stable high responsiveness, and has no obvious error after being repeatedly used for 100 times. The method provided by the invention has a better application prospect in the fields of preparation of polystyrene microspheres, hollow silicon dioxide microspheres and photonic crystals thereof, preparation of patterns, detection of various solvents and steam thereof and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and functional polymer materials, and in particular relates to the preparation and application of photonic crystal materials with responsive invisible patterns. Background technique [0002] Photonic crystal materials are optical materials with periodic micro-nano structures inspired by natural materials such as butterfly wings and bird feathers. These periodic micro-nano structures will cause coherent interference of light, and then make the photonic crystal material present a specific structural color. In the past decade, the applications of photonic crystal materials in optical devices, pattern printing, sensors, information encoding and anti-counterfeiting have been discovered and expanded. Encapsulating responsive invisible patterns in photonic crystals is a common strategy in the fields of anti-counterfeiting and information encryption. However, the existing encryption strategi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B28/04C30B29/18G01N21/25G01N21/47G02B1/00
CPCC30B7/14C30B29/18C30B28/04G02B1/005G01N21/25G01N21/4738
Inventor 陈明清肖鑫王逸施冬健倪忠斌东为富
Owner JIANGNAN UNIV
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