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A photonic crystal paper that can be used for multi-color printing and its application

A photonic crystal, cation technology, applied in special paper, papermaking, paper and other directions, can solve the problems of limiting the application of photonic crystal paper, unable to realize multi-color printing, rough reflection wavelength and so on

Active Publication Date: 2022-05-17
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current photonic crystal paper, in addition to the new erasing and revealing functions, cannot realize the ability of multi-color printing, and can only realize the printing of a single color and the control of reflection wavelength is relatively rough.
Therefore, it cannot have multiple functional uses like traditional paper, which also limits the application of photonic crystal paper

Method used

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  • A photonic crystal paper that can be used for multi-color printing and its application
  • A photonic crystal paper that can be used for multi-color printing and its application
  • A photonic crystal paper that can be used for multi-color printing and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A photonic crystal paper that can be used for multi-color printing. The photonic crystal paper is prepared from chitosan nanocrystals and low molecular weight anionic oligomers through evaporation-induced self-assembly into a film. The specific preparation steps are as follows:

[0044]Take 5mL of chitosan nanocrystal suspension, concentrate it to 1mL (mass fraction is about 3 ± 0.2%), and carry out ultrasonic mixing with the anionic oligomer whose mass is 4:1, and then put it under the condition of 27 ℃ , self-assembled at a humidity of 70% RH to prepare a uniform blue-green photonic crystal film.

[0045] Wherein, chitosan nanocrystals are prepared by the following method:

[0046] Chitosan is configured into a 0.5% solution, soaked for 10 hours, introduced into a wet mill for mechanical crushing, and then the obtained chitosan microfiber slurry is freeze-dried for subsequent use;

[0047] Get 1g of freeze-dried chitosan fiber and dissolve it in 15mL of 40% NaOH solu...

Embodiment 2

[0053] A multi-color printing method for photonic crystal paper, comprising the steps of:

[0054] Configure 5 different solutions as ink for writing or printing, Ph in the 5 inks 4 As + :C 8 h 20 N + The sum of the concentration is 200mmol / L, respectively Ph 4 As + :C 8 h 20 N + =200:0; 150:50; 125:75; 100:100; 80:120;

[0055] Utilize the inkjet printing function of the microelectronics printer to print the configured ink on the photonic crystal paper of embodiment 1, in order to ensure the complete ion exchange degree, the number of printings is 10 times, it is washed and dried in ethanol, and then It is immersed in water and its reflectance spectrum is measured;

[0056] Select suitable ink and pattern, utilize the ink-jet printing function of microelectronics printer, pattern is printed on the photonic crystal paper prepared in embodiment 1, in order to guarantee complete ion exchange degree, printing number of times is 10 times, it is in ethanol Wash and dry, ...

Embodiment 3

[0061] A photonic crystal paper that can be used for multi-color printing. The photonic crystal paper is prepared from chitosan nanocrystals and low molecular weight anionic oligomers through evaporation-induced self-assembly into a film. The specific preparation steps are as follows:

[0062] Take 5mL of chitosan nanocrystal suspension, concentrate it to 1mL (mass fraction is about 3 ± 0.2%), and carry out ultrasonic mixing with the anionic oligomer whose mass is 2:1, and then put it under the condition of 27 ℃ , self-assembled at a humidity of 70% RH to prepare a uniform blue-green photonic crystal film.

[0063] Chitosan nanocrystals have an aspect ratio of 15 and a length of 200nm.

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Abstract

The invention discloses a photon crystal paper which can be used for multi-color printing and its application. Photonic crystal paper is prepared from chitosan nanocrystals and low molecular weight anionic oligomers through evaporation-induced self-assembly into films. After printing, the photonic crystal paper of the present invention uses cations with strong hydrophobicity to exchange with anionic oligomers, thereby forming different water absorption properties in the printing area and the non-printing area, and can produce different wavelength redshift values ​​under infiltration, reaching The effect of color difference, so the effect of color printing is achieved, which overcomes the problem that the existing photonic crystal paper can only achieve monochrome printing. Photonic crystal paper also has the ability to display and hide information or patterns and the ability to repeatedly write, which can be widely used in anti-counterfeiting Materials, printing materials, non-polluting dyes and multi-color display materials in the field of various material preparation.

Description

technical field [0001] The invention relates to the technical field of information display materials, in particular to a photonic crystal paper that can be used for multi-color printing and its application. Background technique [0002] As an information carrier, paper plays an important role in information dissemination. However, the non-repeatability of paper during use has caused a large amount of waste after reading and using. According to agency statistics, currently 70% of information storage and dissemination rely on paper, and a large amount of waste of paper not only causes waste and pollution, but also consumes a lot of energy and trees. Therefore, researchers are committed to the development of multifunctional paper with information bearing and display. Nature Communications, a subsidiary of Nature Magazine, has published a dye-based rewritable printing paper that can be loaded with information displayed on water as ink. [0003] CN102874002A discloses a method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/30D21H19/38D21H23/22D21H27/00
CPCD21H13/30D21H19/38D21H23/22D21H27/00
Inventor 陈旭东洪炜陈锐炼
Owner SUN YAT SEN UNIV