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Nano-cellulose liquid crystal membrane and application thereof

A technology of nanocellulose and liquid crystal film, which is applied in the field of polymers and nanomaterials, can solve problems that are rarely reported, and achieve the effects of low cost, enhanced strength, and simple synthesis process

Inactive Publication Date: 2012-10-03
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose nanocrystals have become a hot spot in the field of polymer research, but there are few reports on cellulose nanocrystals cholesteric liquid crystal materials and their preparation methods

Method used

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  • Nano-cellulose liquid crystal membrane and application thereof
  • Nano-cellulose liquid crystal membrane and application thereof
  • Nano-cellulose liquid crystal membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Suspension preparation:

[0033] Add deionized water to the cellulose nanocrystal powder to prepare a cellulose nanocrystal suspension with a concentration of 1.15%. Example 2

Embodiment 2

[0034] Suspension preparation:

[0035] Add deionized water to the cellulose nanocrystal powder to prepare a 2.03% cellulose nanocrystal suspension.

Embodiment 3

[0037] Gel preparation:

[0038] Add deionized water to the cellulose nanocrystal powder to prepare a 1.0% cellulose nanocrystal suspension. Stand at room temperature for one month to obtain cellulose nanocrystalline gel. The prepared gel can clearly observe the blue light with the naked eye.

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Abstract

The invention discloses a nano-cellulose liquid crystal membrane. The liquid crystal membrane is provided with rainbow stripes, and is prepared by the following steps of: adding water into cellulose nano-crystal powder to obtain cellulose nano-crystal suspension at the mass concentration of 0.1 to 10 percent; and putting the suspension into a culture vessel or spraying the suspension onto the surface of a medium, and heating and evaporating at the temperature of 20 to 80 DEG C for 1 to 12 hours to obtain the nano-cellulose liquid crystal membrane. The liquid crystal membrane can be used for decoration, anti-fake labels, color coatings and temperature sensors or optical verification equipment. For example, the membrane is sprayed on a substrate carrying data such as an identity card or a credit card so as to stop the attempt of faking by using a color copying machine.

Description

technical field [0001] The invention relates to a nano-cellulose liquid crystal film and its application, in particular to a cellulose nano-crystal cholesteric phase liquid crystal material and a preparation method thereof, which belongs to the field of macromolecules and also belongs to the field of nano-materials. Background technique [0002] Cellulose is the most abundant organic compound on Earth. It is a major component of the cell wall structure of higher plants and green algae, and is also formed by bacteria, certain fungi, and tunicates (invertebrate marine animals). Because of its low cost, self-renewal ability and recyclability, and its chemical reactivity, cellulose can be used in various applications, and its processing and utilization will inevitably bring high economic value. With the development of nanotechnology, scientists have discovered that nanocellulose crystals undergo a transition from anisotropy to isotropy to liquid crystal phases at high concentra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38C09D101/08G09F3/00G01K11/16G01K11/165
Inventor 刘大刚林凤英花艳田东林
Owner NANJING UNIV OF INFORMATION SCI & TECH
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