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A method for preparing chirality-reversed graphene liquid crystals by nanofluid rectification

A technology of graphene and chirality, which is applied in liquid crystal materials, chemical instruments and methods, wet spinning methods, etc., can solve the problems of inability to realize chirality inversion of liquid crystal arrays, etc., so as to facilitate the promotion and use of industrialization and realize chirality inversion , The effect of simple assembly equipment

Active Publication Date: 2021-06-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] CN 110607569 A discloses a method for preparing nanocellulose liquid crystal microfibers by two-dimensional confinement self-assembly, wherein the nanocellulose is in the shape of a nanoscale short rod, and the shear force provided horizontally to the polymer flow can only promote the assembly of the nanocellulose , the chiral inversion of the liquid crystal array cannot be achieved

Method used

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  • A method for preparing chirality-reversed graphene liquid crystals by nanofluid rectification
  • A method for preparing chirality-reversed graphene liquid crystals by nanofluid rectification
  • A method for preparing chirality-reversed graphene liquid crystals by nanofluid rectification

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Embodiment 1

[0052] 1) Introduction of polymers that provide radial shear force: 0.05g sodium alginate powder (AR grade, purity 90%, Shanghai Aladdin Biochemical Technology Co., Ltd.) and 0.5g glucose powder (AR grade, Shanghai Aladdin Biochemical Co., Ltd.) Science and Technology Co., Ltd.) was added to 10mL GO (particle size ~ 50μm) solution and magnetically stirred for 10min to prepare a uniform injection, wherein the mass fraction of GO in the GO solution was 0.2wt%;

[0053] 2) Preparation of salt solution to drive the outward migration of the polymer: Add 2.775g of anhydrous calcium chloride (Shanghai Aladdin Biochemical Technology Co., Ltd.) into 500mL of deionized water and sonicate for 5min under 100W ultrasonic conditions to prepare 50mM chlorine Calcium coagulation bath;

[0054] 3) Preparation of chirality-reversed GO liquid crystal fibers

[0055] Inject the receiving liquid obtained in step 1) into the calcium chloride coagulation bath obtained in step 2) through a syringe, ...

Embodiment 2

[0064] Except that the mass fraction of GO in the GO solution in step 1) was changed to a low concentration of 0.08wt% and a high concentration of 0.15wt%, other GO liquid crystal microfibers were prepared according to the same preparation steps as in Example 1.

[0065] The radial direction of the GO liquid crystal fiber obtained in Comparative Example 1 is a solid cross pattern, and as the concentration of GO decreases, the cross pattern becomes a hollow cross pattern and a skin-like cross pattern, which is due to the polymer flow driving the GO sheet The layers migrate outward, and the assembly of GO proceeds from the outside in.

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Abstract

The invention relates to a method for preparing chiral inversion graphene liquid crystal through nanofluid rectification. The material is formed by the outward migration of sodium alginate guided by calcium ions with components including sodium alginate, glucose and graphene oxide GO. Polymer nanofluids, and driven GO inversion were obtained. The method of the invention is simple to operate and easy to produce on a large scale, and the prepared liquid crystal microfiber has a long-range ordered structure, a stable topological configuration and a controllable optical appearance. It has wide application prospect.

Description

technical field [0001] The invention belongs to the field of graphene liquid crystal materials, in particular to a method for preparing chiral inversion graphene liquid crystals through nanofluid rectification. Background technique [0002] Colloidal liquid crystals formed by nanoparticles have attracted extensive attention of researchers due to their special structure and topology. (Y. Li, et al., Nat. Commun. 2016, 7, 12520). This unique structure and topology can be used in the study of fundamental soft matter, or as a template for the production of new materials with other complex structures (K.E. Shopsowitz, et al., Nature 2010, 468, 422-425). [0003] Graphene oxide (GO) is a graphene derivative containing oxygen atoms, which can spontaneously assemble into a liquid crystal solution at a critical concentration (Y.H.Shim, et al., Mater.Horiz.2017, 4, 1157-1164.) . As a new type of two-dimensional colloid, GO liquid crystals have attracted great attention from researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/04D01F1/10D01D5/06C09K19/02
CPCC09K19/02D01D5/06D01F1/10D01F9/04
Inventor 武培怡刘艳军
Owner DONGHUA UNIV
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