Preparation and Application of Photonic Crystal Materials with Responsive Stealth Patterns

A photonic crystal and responsive technology, which is applied in the field of nanomaterials and functional polymer materials, can solve the problems of swelling of the responsiveness of the pattern area or poor tensile performance, inability to develop color, and poor mechanical properties of the pattern, etc., to achieve excellent stability Sexual, quick response effect

Active Publication Date: 2022-07-05
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 Materials with Responsive Stealth Patterns
  • Preparation and Application of Photonic Crystal Materials with Responsive Stealth Patterns
  • Preparation and Application of Photonic Crystal Materials with Responsive Stealth Patterns

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 Preparation of hollow silica photonic crystals

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

[0054] 0.6g of styrene, 0.9g of polyvinylpyrrolidone, 0.13g of 2,2'-azobisisobutylamidine dihydrochloride and 300g of water were added to a 500mL three-necked flask, and the reaction was carried out at 70°C for 24h. Purified by centrifugal washing, and finally obtained polystyrene microspheres with a diameter of 205nm;

[0055] Next, prepare polystyrene@silica microspheres: Disperse 0.6 g of polystyrene microspheres in 120 mL of ethanol. Then 3.1 mL of tetraethyl orthosilicate and 8 mL of aqueous ammonia were added to the diluted dispersion under magnetic stirring. The reaction was carried out at 50°C for 3h. Purification by centrifugation washing finally yielded polystyrene@silica colloids with a diameter of 245 nm.

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

Embodiment 2

[0062] Example 2 Hollow silica photonic crystal material with responsive stealth 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-methacryloyloxypropyltrimethoxysilane 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 for 6 h with continuous stirring at room temperature. Then, the obtained membrane was completely washed with ethanol to obtain the olefin-modified hollow silica photonic crystal.

[0065] It should be noted that, under the same conditions, when the addition amount of γ-methacryloyloxypropyltrimethoxysilane was replaced by 3.0 mL, 4.5 mL and 6.0 mL, respectively, the olefin-modified hollow dimethoxysilane could be successfully prepared. Silica photonic crystal; under the same conditions, when the addition amount of ammonia water was replaced by 1.5...

Embodiment 3

[0069] Example 3 Water vapor visible detection of responsive invisible patterns

[0070] In the obtained thiol-modified hollow silica photonic crystal, the olefin-modified region (background region) and the cysteamine hydrochloride-modified region (pattern region) without thiol group were placed in a dynamic environment with a relative humidity of 80% RH The reflection spectrum was measured under moisture, and after 1 second, the background area had no significant change in the reflection spectrum, while the maximum reflection wavelength of the pattern area had a significant red shift (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 the preparation and application of photonic crystal materials with responsive invisible patterns, and belongs to the technical field of nanometer materials and functional polymer materials. The invention uses polystyrene microspheres as templates to prepare hollow silica photonic crystals, and then selectively constructs regions with different hydrophilicity and hydrophobicity on the hollow silica photonic crystals through Michael addition reaction to form regions that can selectively respond to water vapor. invisible pattern. The modified hollow silica photonic crystal material with invisible patterns prepared by the invention can be used for moisture detection and other solvent detection. Under the action of dynamic moisture, obvious patterns of different colors can be displayed within 1 second, and its It has long-term stability and high responsiveness, and there is no obvious error after 100 repetitions. The method provided by the invention has good application prospects in the fields of preparation of polystyrene microspheres, hollow silica microspheres and photonic crystals thereof, patterned preparation, detection of various solvents and their vapors, and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and functional polymer materials, in particular 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 cause coherent interference of light, which in turn makes photonic crystal materials exhibit specific structural colors. In the past decade, the application of photonic crystal materials in optical devices, pattern printing, sensors, information encoding and anti-counterfeiting has been discovered and expanded. Encapsulating responsive invisible patterns in photonic crystals is a common strategy in the field of anti-counterfeiting and information encryption. However, existing encryption strategies have many limitations: fo...

Claims

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Application Information

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Patent Type & Authority Patents(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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