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Nano-crystalline cellulose-based circularly polarized luminescence material, preparation method and application thereof in anti-counterfeiting

A nanocellulose, luminescent material technology, applied in luminescent materials, chemical instruments and methods, coatings, etc., can solve the problem that the chiral circularly polarized luminescence of crystalline nanocellulose has not been developed, and achieve advanced anti-counterfeiting capabilities. , Wide source of raw materials, cost saving effect

Active Publication Date: 2018-05-04
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, the properties of chiral circularly polarized luminescence based on crystalline nanocellulose have not been exploited

Method used

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  • Nano-crystalline cellulose-based circularly polarized luminescence material, preparation method and application thereof in anti-counterfeiting
  • Nano-crystalline cellulose-based circularly polarized luminescence material, preparation method and application thereof in anti-counterfeiting
  • Nano-crystalline cellulose-based circularly polarized luminescence material, preparation method and application thereof in anti-counterfeiting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: Preparation of composite film in crystalline nanocellulose and small organic molecules:

[0048] (1) Add 20g of pulp cellulose (a kind of lignocellulose) to 200mL of sulfuric acid aqueous solution with a mass fraction of 65%, stir at 50°C for 90min for acid hydrolysis, and then add 2000mL of deionized water to terminate the reaction , and after the obtained solution was left to stand, the supernatant was poured off, the separated precipitate was centrifuged using a centrifuge, and the obtained precipitate was dispersed in water after centrifugal washing with deionized water for three times, and the dispersed crystalline nano The colloidal solution of cellulose is injected into the ultrafiltration cup and dialyzed with deionized water until the pH reaches a stable value, and finally the colloidal solution of crystalline nanocellulose is obtained. At this time, the mass fraction of crystalline nanocellulose is 3%. , save for later use.

[0049] (2) Take 5 m...

Embodiment 2

[0052] Embodiment 2: Preparation of crystalline nanocellulose and M1 composite film:

[0053] (1) Concrete operation is the same as embodiment 1 step (1).

[0054] (2) Take 5 mL of crystalline nanocellulose solution with a mass fraction of 3%, stir it for 60 minutes after ultrasonication, pour the solution into a petri dish with a diameter of 5 cm, and self-assemble at 25°C to obtain pure crystalline nanofibers plain film. Prepare an aqueous solution of M1 with a concentration of 1 mM, and attach 100 μL of the solution to one side of the pure crystalline nanocellulose membrane by drip coating. After drying, an outer composite membrane of crystalline nanocellulose and fluorescent objects is obtained. The thickness of the membrane is is 67 μm.

[0055] figure 1 (b) is a photo of the composite film of crystalline nanocellulose and M1 sub-exterior;

[0056] image 3 It is the circularly polarized emission spectrum of the composite film of crystalline nanocellulose and organic...

Embodiment 3

[0057] Embodiment 3: Preparation of composite film in crystalline nanocellulose and rhodamine B:

[0058] (1) Concrete operation is the same as embodiment 1 (1).

[0059] (2) Take 5 mL of crystalline nanocellulose solution with a mass fraction of 3%, slowly add 100 μL of 2 mM Rhodamine B aqueous solution, and stir for 60 min after ultrasonication to form a uniform and stable mixed solution. Pour the mixed solution into a solution with a diameter of 5 cm Naturally dried in a petri dish at 25°C to form a film. After the water evaporated, the co-assembly of crystalline nanocellulose and fluorescent objects was completed, and an inner composite film of crystalline nanocellulose and rhodamine B was obtained. The thickness is 65 μm. .

[0060] Figure 4 It is the circularly polarized emission spectrum of the composite film of crystalline nanocellulose and rhodamine B.

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Abstract

The invention discloses a nano-crystalline cellulose-based circularly polarized luminescence material, a preparation method and application thereof in anti-counterfeiting and belongs to the technicalfield of circularly polarized luminescence materials. The luminescence material is a composite film, and circularly polarized light is obtained by compounding nano-crystalline cellulose and a fluorescence guest. The composite film is divided into two types, namely an inner composite film and an outer composite film, wherein the inner composite film is a film formed by assembling the nano-crystalline cellulose and the fluorescence guest and can realize right-handed rotation circularly polarized light; and the outer composite film is prepared by self-assembling the nano-crystalline cellulose toform a film and compounding the outer part of the fluorescence guest, and can realize left-handed and right-handed rotation chiral circularly polarized light. The circularly polarized light generatedbased on the nano-crystalline cellulose composite film has a great factor g, the nano-crystalline cellulose film is easily patterned, and by introducing chiral circularly polarized light identification, the luminescence material achieves an anti-counterfeiting effect, is high in anti-counterfeiting ability, difficult to counterfeit and advanced in technology.

Description

technical field [0001] The invention belongs to the technical field of circularly polarized luminescent materials, and in particular relates to a circularly polarized luminescent material based on crystalline nanocellulose, a preparation method and its application in anti-counterfeiting. Background technique [0002] Circularly polarized light has always attracted people's attention. It contains richer optical information, has unique properties such as high optical sensitivity and optical resolution, so it is used in 3D optical display, circularly polarized light information encryption, biological coding, optical data It has broad application prospects in storage and optical devices. In nature, some animals use circularly polarized light as a language of communication to achieve functions such as sexual signal transmission and territorial defense. Circularly polarized light is divided into passive circularly polarized light and active circularly polarized light. That is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J7/06C08J7/04C09K11/02C09K11/06C08B15/02C08L1/04
CPCC08B15/02C08J5/18C08J7/06C08J2301/04C09K11/025C09K11/06C09K2211/1014C09K2211/1088C09K2211/1483C08J7/0427
Inventor 徐雁郑洪芝张晓安
Owner JILIN UNIV
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