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Crystalline-state nanocellulose-based double circularly polarized light/fluorescent thin film material as well as preparation method and application thereof to anti-counterfeiting label

A nanocellulose, circularly polarized light technology, applied in the direction of polarizing elements, optics, optical elements, etc., to achieve the effect of simple processing method, low cost, and diversified patterns

Inactive Publication Date: 2019-12-06
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adjusting the assembly conditions, it is feasible to obtain a fully crystalline nanocellulose film with a left-handed chiral nematic structure embedded in a nematic defect structure. Although it has not been reported so far, it is indeed feasible.

Method used

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  • Crystalline-state nanocellulose-based double circularly polarized light/fluorescent thin film material as well as preparation method and application thereof to anti-counterfeiting label
  • Crystalline-state nanocellulose-based double circularly polarized light/fluorescent thin film material as well as preparation method and application thereof to anti-counterfeiting label
  • Crystalline-state nanocellulose-based double circularly polarized light/fluorescent thin film material as well as preparation method and application thereof to anti-counterfeiting label

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: Preparation of crystalline nanocellulose-based dual circularly polarized light / fluorescent film materials under the conditions of 4°C evaporation temperature and 4% initial concentration mass fraction of crystalline nanocellulose colloidal solution:

[0056] (1) Cellulose (cotton pulp cellulose 20g) was stirred with 64% sulfuric acid aqueous solution (220mL) at 45°C for 90min for hydrolysis reaction, then deionized water was used to terminate the reaction, and the obtained solution was poured out after standing The supernatant solution is centrifuged and washed 4 times with deionized water, and the solution is dialyzed to pH=7 with deionized water to obtain a crystalline nanocellulose colloidal solution for use, with a mass fraction of 1-2%.

[0057] (2) Concentrate the crystalline nanocellulose colloidal solution obtained in step (1) to a mass fraction of 4%, take 4 mL of the colloidal solution of the concentrated crystalline nanocellulose obtained, stir for ...

Embodiment 2

[0060] Example 2: Preparation of crystalline nanocellulose-based double circularly polarized light / fluorescence film material under the conditions of 25°C evaporation temperature and 4% initial concentration mass fraction of crystalline nanocellulose colloid:

[0061] (1) The operation is the same as in Embodiment 1.

[0062] (2) Concentrate the crystalline nanocellulose colloidal solution obtained in step (1) to a mass fraction of 4%, take 4 mL of the colloidal solution of the concentrated crystalline nanocellulose obtained, stir for 2 hours, and after forming a uniform and stable solution, pour Put it into a petri dish with a diameter of 3.5 cm, self-assemble at 25° C., and obtain a crystalline nanocellulose bi-circularly polarizing film 2 after the water evaporates.

[0063] Concentrate the colloidal solution of crystalline nanocellulose obtained in step (1) to a mass fraction of 4%, take 35 mL of the colloidal solution of the concentrated crystalline nanocellulose obtained...

Embodiment 3

[0066] Example 3: Preparation of crystalline nanocellulose-based dual circularly polarized light / fluorescent film materials under the conditions of 50°C evaporation temperature and 4% initial concentration of crystalline nanocellulose colloid mass fraction:

[0067] (1) The operation is the same as in Embodiment 1.

[0068] (2) Concentrate the crystalline nanocellulose colloidal solution obtained in step (1) to a mass fraction of 4%, take 4 mL of the colloidal solution of the concentrated crystalline nanocellulose obtained, stir for 2 hours, and after forming a uniform and stable solution, pour Put it into a petri dish with a diameter of 3.5 cm, self-assemble at 50°C, and obtain a crystalline nanocellulose bicircularly polarizing film 3 after the water evaporates.

[0069] Concentrate the colloidal solution of crystalline nanocellulose obtained in step (1) to a mass fraction of 4%, take 4 mL of the colloidal solution of the concentrated crystalline nanocellulose obtained, and ...

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Abstract

The invention provides a crystalline-state nanocellulose-based double circularly polarized light / fluorescent thin film material as well as a preparation method and application thereof to an anti-counterfeiting label and belongs to the technical field of circularly polarized light materials. A full-crystalline-state nanocellulose thin film with a left-handed chiral nematic structure having embeddednematic defects is obtained for the first time by adopting a one-step method through changing two self-assembling conditions including evaporation temperature and initial concentration of a crystalline-state nanocellulose colloidal solution and capturing a metastable-state crystalline-state nanocellulose nematic phase. The nematic defect structure has a half-wavelength retardation effect so thatchiral overturning of circularly polarized light is caused to obtain selectively reflected left-handed and right-handed double circularly polarized light; and a fluorescent object is embedded so as toobtain a double circularly polarized fluorescent signal regulated and controlled by an optical forbidden band in a range from a near ultraviolet waveband to a near infrared waveband. The thin film material can obtain different circularly polarized light patterns through different observation modes so as to realize the application of top-grade anti-counterfeiting labels.

Description

technical field [0001] The invention belongs to the technical field of circularly polarized light materials, and in particular relates to a crystalline nanocellulose-based double circularly polarized light / fluorescent film material, a preparation method and its application in anti-counterfeiting marks. Background technique [0002] Cellulose is the natural polymer with the highest storage capacity in nature. Linear polysaccharides formed by D-glucose connected by β-1, 4 glycosidic bonds are mostly distributed in the cell walls of plants, and a few urochordates also contain cellulose in the capsule; in addition, cellulose also exists in in the secretions of some microorganisms. Natural cellulose includes crystalline and non-crystalline regions. The amorphous part of the non-crystalline region can be removed by hydrolysis with sulfuric acid to obtain cellulose in the crystalline region. The size ranges from 5-50nm, so it is called crystalline nanocellulose. Amorphous cellul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/04G02B5/30
CPCC08J5/18C08J2301/04G02B5/3033
Inventor 徐雁陶佳伟张丹
Owner JILIN UNIV
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