A method for preparing nanocellulose liquid crystal microgrid film by two-dimensional confined self-organization

A nano-cellulose and micro-grid technology, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve problems such as the inability to realize the precise control of CNC microstructure, and achieve the effects of industrial promotion and use, precise microstructure, and high transparency

Active Publication Date: 2021-11-02
DONGHUA UNIV
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing nanocellulose liquid crystal microgrid film by two-dimensional confined self-organization, so as to overcome the self-assembly of CNC by natural evaporation on an infinite plane in the prior art. The control of the pitch of the CNC cholesteric array cannot realize the precise regulation of the CNC microstructure.

Method used

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  • A method for preparing nanocellulose liquid crystal microgrid film by two-dimensional confined self-organization
  • A method for preparing nanocellulose liquid crystal microgrid film by two-dimensional confined self-organization
  • A method for preparing nanocellulose liquid crystal microgrid film by two-dimensional confined self-organization

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 1) Set the aperture to 610*610μm 2 The metal micro-grid was tiled on the glass substrate, and then the mass fraction of 1wt% cellulose nanocrystal (CNC) aqueous solution was added dropwise on the metal micro-grid, so that each grid hole was filled with the CNC solution, and finally the Scrape off the excess CNC solution on the surface of the metal microgrid on the glass slide;

[0044] 2) Place the substrate and the metal microgrid at room temperature to dry naturally. Driven by the evaporation of water, the CNC gradually migrates to the grid boundary in the metal microgrid on the substrate and deposits down to form nanocellulose liquid crystal microgrid;

[0045] 3) Remove the metal microgrid, apply a 25wt% methylcellulose solution on the liquid crystal microgrid, dry it at 55°C for 1.5h, and then peel off the methylcellulose film from the substrate After that, a nanocellulose liquid crystal microgrid film with high mechanical strength (tensile stress 110 MPa), excel...

Embodiment 2

[0050] In addition to changing step 1) the aperture of the metal microgrid to 450*450μm 2 、310*310μm 2 、250*250μm 2 , and others were prepared according to the same preparation steps as in Example 1 to prepare a nanocellulose liquid crystal microgrid film.

[0051] The inside of the microgrid of the nanocellulose liquid crystal microgrid film obtained in Comparative Example 1 has regular concentric circle color bands ( Figure 4 ), the internal morphology of the microgrid obtained by embodiment 2 of the nanocellulose liquid crystal microgrid film decreases with the grid size, the concentric circles of color bands disappear, and the arrangement of the CNC appears inhomogeneous. The aperture is 450*450μm 2 The concentration of CNC inside the liquid crystal micro-grid gradually decreases from the center to the boundary, the concentric circle color band remains, and the arrangement of CNC is uniform; the aperture is 310*310μm 2 When the concentration of CNC inside the liquid c...

Embodiment 3

[0054] Except for changing the mass fraction of CNC in step 1) to 2 wt%, the same preparation steps as in Example 1 were used to prepare a nanocellulose liquid crystal microgrid film.

[0055] Compared with the highly transparent nanocellulose liquid crystal microgrid film obtained in Example 1, the transparency of the nanocellulose liquid crystal microgrid film obtained in Example 3 was reduced to 79%. This is because the high concentration of CNC increases the thickness of CNC inside the microgrid in the liquid crystal microgrid film, which affects the light transmittance.

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Abstract

The invention relates to a method for preparing a nano-cellulose liquid crystal microgrid film by two-dimensional confined self-organization. The method includes: laying the metal micro-grid on the substrate, dripping the CNC solution onto the metal micro-grid, scraping off the excess CNC solution on the surface of the metal grid, drying naturally, and the CNC gradually migrates in the metal micro-grid The nanocellulose liquid crystal microgrid is formed, the metal microgrid is removed, the methyl cellulose solution is coated on the liquid crystal microgrid, dried, and peeled off. The method can realize precise control of the nanocellulose array, and prepare a nanocellulose liquid crystal film with a microscopic grid array, and the liquid crystal microgrid film also exhibits certain mechanical strength and stretchability.

Description

technical field [0001] The invention belongs to the field of preparation of nano-cellulose liquid crystal micro-grid film, in particular to a method for preparing nano-cellulose liquid crystal micro-grid film by two-dimensional confined self-organization. Background technique [0002] In nature, organisms assemble a variety of multifunctional structures to adapt to the external environment by precisely regulating the interactions between building blocks (Ulrike G.K. Wegst, Hao Bai, Eduardo Saiz, Antoni P. Tomsia, and Robert O. Ritchie, Nat. Mater., 2015, 14, 23-36.). How to artificially imitate complex and ingenious multi-level structures, and then assemble multifunctional biomimetic materials by editing the functions of different modules in the multi-level structure is a frontier topic in the field of functional materials preparation (Andre R. Studart, Angew. Chem. Int. Ed., 2015, 54, 2-19.). Moreover, it is of great scientific and social significance to develop multifunc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/02C09K19/38
CPCC08J5/18C08J2301/02C09K19/3819
Inventor 武培怡刘艳军
Owner DONGHUA UNIV
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