Cellulose nanocrystal/nano-silver chiral nematic composite film and preparation method thereof

A nanocrystal, chiral nematic technology, applied in the field of cellulose nanocrystal/nanosilver chiral nematic composite film and its preparation, can solve the problem of poor chiral structure consistency, affecting optical properties and practical applications, and assembly and production of noble metal nanomaterials. It can improve the circular dichroism, increase the assembly yield and reduce the production cost.

Inactive Publication Date: 2018-11-02
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chiral noble metal nanomaterials prepared using these templates have low assembly yields and poor chiral structure consistency, which seriously affect their optical properties and practical applications.

Method used

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  • Cellulose nanocrystal/nano-silver chiral nematic composite film and preparation method thereof
  • Cellulose nanocrystal/nano-silver chiral nematic composite film and preparation method thereof
  • Cellulose nanocrystal/nano-silver chiral nematic composite film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]A kind of cellulose nanocrystal / nano silver chiral nematic composite membrane of the present invention, described composite membrane comprises cellulose nanocrystal and nano silver, the mass ratio of described cellulose nano crystal and nano silver is 25, described composite membrane The interior of the composite film has a chiral nematic liquid crystal phase structure, and the thickness of the composite film is 0.1 mm.

[0039] The preparation method of described cellulose nanocrystal / nanosilver chiral nematic composite membrane comprises the following steps:

[0040] (1) Weigh 2.50g of nanofiber microcrystalline powder into a three-necked flask, add 100ml of 64% sulfuric acid, stir at 250r / min at 45°C, and hydrolyze for 1 hour; In a beaker of ionized water, stop the hydrolysis of sulfuric acid to obtain a white emulsion; then centrifuge the obtained white emulsion to remove most of the remaining sulfuric acid, centrifuge at 8000r / min for 10min, remove the supernatant, ...

Embodiment 2

[0045] A kind of cellulose nanocrystal / nanometer silver chiral nematic composite film of the present invention, described composite film comprises cellulose nanocrystal and nano silver, the mass ratio of described cellulose nano crystal and nano silver is 15.6, described composite film The interior of the composite film has a chiral nematic liquid crystal phase structure, and the thickness of the composite film is 0.12 mm.

[0046] The preparation method of described cellulose nanocrystal / nanosilver chiral nematic composite membrane comprises the following steps:

[0047] (1) Weigh 2.50g of nanofiber microcrystalline powder into a three-necked flask, add 100ml of 64% sulfuric acid, stir at 250r / min at 45°C, and hydrolyze for 1 hour; In a beaker of ionized water, stop the hydrolysis of sulfuric acid to obtain a white emulsion; then centrifuge the obtained white emulsion to remove most of the remaining sulfuric acid, centrifuge at 8000r / min for 10min, remove the supernatant, and...

Embodiment 3

[0052] A kind of cellulose nanocrystal / nano silver chiral nematic composite membrane of the present invention, described composite membrane comprises cellulose nanocrystal and nano silver, the mass ratio of described cellulose nano crystal and nano silver is 50, described composite membrane The interior of the composite film has a chiral nematic liquid crystal phase structure, and the thickness of the composite film is 0.1mm.

[0053] The preparation method of described cellulose nanocrystal / nanosilver chiral nematic composite membrane comprises the following steps:

[0054] (1) Weigh 2.50g of nanofiber microcrystalline powder into a three-necked flask, add 100ml of 64% sulfuric acid, stir at 250r / min at 45°C, and hydrolyze for 1 hour; In a beaker of ionized water, stop the hydrolysis of sulfuric acid to obtain a white emulsion; then centrifuge the obtained white emulsion to remove most of the remaining sulfuric acid, centrifuge at 8000r / min for 10min, remove the supernatant, ...

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Abstract

The invention discloses a cellulose nanocrystal/nano-silver chiral nematic composite film. The cellulose nanocrystal/nano-silver chiral nematic composite film comprises cellulose nanocrystals and nano-silver. The mass ratio of the cellulose nanocrystals to the nano-silver is 11.5-5,049, the inside of the composite film adopts a chiral nematic liquid crystalline phase structure, and the thickness of the composite film is 0.1-1 mm. The composite film has excellent circular dichroism and can be used in anti-counterfeiting labels, asymmetric organic synthesis, chiral molecular screening and otherfields. The preparation method of the composite film comprises steps as follows: a cellulose nanocrystal suspension was prepared with a sulfuric acid hydrolysis method, a nano-silver solution was prepared with a redox method, the cellulose nanocrystal suspension is mixed with the nano-silver solution, and ultrasonic treatment, evaporation and self-assembly for film forming are performed. Accordingto the method, nano-silver is induced by cellulose nanocrystals to form the chiral nematic composite film with strong circular dichroism, so that the production cost is reduced and green and non-toxic production is realized.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a cellulose nanocrystal / nano silver chiral nematic composite film and a preparation method thereof. Background technique [0002] Chirality is a common phenomenon in nature. It means that an object cannot be superimposed on its mirror image, just like the left hand and right hand are mirror images of each other but cannot be superimposed. We call this object chiral. Noble metal nanoparticles are used as structural units to synthesize noble metal nanomaterials with chiral structure through chiral templates, which have unique optical properties and have important application value in the fields of anti-counterfeiting labels, asymmetric organic synthesis, and chiral molecular screening. [0003] In recent years, some chiral templates, such as DNA with a helical structure, and chiral supramolecular assemblies have been widely used to prepare chiral noble metal n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/04C08K3/08
CPCC08J5/18C08J2301/04C08K2003/0806C08K2201/011
Inventor 卿彦吴义强王礼军罗莎刘柳李贤军
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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