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A preparation method of graphene oxide sheet/liquid crystal/film with different number of layers

A technology of graphene film and graphene sheet, which is applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems that the self-assembly process of graphene oxide sheet has not been reported, and achieve good application prospects, simple method, The effect of controllable film size

Active Publication Date: 2017-12-29
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid crystal behavior based on single-layer graphene oxide sheets has been reported, but the liquid crystal behavior and self-assembly process of multi-layer and two-layer graphene oxide sheets have not been reported.

Method used

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  • A preparation method of graphene oxide sheet/liquid crystal/film with different number of layers
  • A preparation method of graphene oxide sheet/liquid crystal/film with different number of layers
  • A preparation method of graphene oxide sheet/liquid crystal/film with different number of layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Disperse 2g of graphite oxide in 1600ml of deionized water to form a suspension with a mass concentration of 0.125%, ultrasonicate for 0.5h at a power of 240W to disperse the graphite oxide in deionized water evenly; put the dispersion at 10000 r / min Centrifuge at a constant centrifugation rate, extract the bottom layer of the centrifuge tube every 30 minutes and record it as a group of samples, and extract 12 times in total. The atomic force microscope photos of the samples extracted at intervals of 30 minutes, 3 hours and 6 hours are shown in figure 1 , it can be seen that the samples extracted at intervals of 30min, 3h, and 6h are respectively multi-layer, double-layer, and single-layer graphene oxide sheets, that is, as the extraction time increases, the thickness of the sample (the number of layers) gradually decreases;

[0019] (2) Then centrifuge and concentrate the samples extracted at intervals of 30min, 3h, and 6h at 10,000 r / min for 30min, and the lower la...

Embodiment 2

[0022] Extend the interval time in step (1) to 2h, and extract 4 times. Correspondingly, the centrifugation time in step (2) is also extended to 2h, and the others are the same as in Example 1.

Embodiment 3

[0024] (1) Disperse 1g of graphite oxide in 1500ml of deionized water to form a suspension with a mass concentration of 0.067%, ultrasonicate for 20min at a power of 240W to disperse graphite oxide in deionized water evenly; keep the dispersion at 10000 r / min constant Centrifuge at a centrifugal speed, extract the bottom layer of the centrifuge tube every 1 hour, record it as a set of samples, extract 6 times in total, and obtain graphene oxide sheets with gradually reduced layers;

[0025] (2), and then centrifuge and concentrate the above samples at 10,000 r / min for 1 hour, and the lower layer is graphene oxide liquid crystal;

[0026] (3) Then, drop-coat the obtained graphene oxide liquid crystal on a glass plate, and dry it naturally at room temperature of 25° C. to obtain a graphene oxide film with birefringence.

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Abstract

The invention belongs to the technical field of graphene oxide preparation, and specifically discloses a method for preparing graphene oxide sheets / liquid crystals / films with different numbers of layers. Disperse graphite oxide in a solvent, ultrasonically treat it, and then centrifuge it. Extract the lower layer of the centrifuge tube every 0.5-3 hours and mark it as a group of samples until the upper layer is colorless and transparent. Remove the solvent in the sample to obtain oxidation. Graphene sheet; the graphene oxide sheet is further centrifuged and concentrated, and the lower layer is removed to remove the solvent to obtain the graphene oxide liquid crystal; the graphene oxide liquid crystal is drop-coated on the substrate, and dried at 15-35°C to obtain the graphene oxide film . The invention solves the problem that the multi-layer, two-layer and one-layer graphene oxide sheets cannot be accurately obtained at the same time and the complicated preparation of the liquid crystal phase is solved. The graphene oxide liquid crystal of the invention is simple to prepare, has zero loss of raw materials, short film assembly cycle, and the obtained film has optical anti-counterfeiting ability, so that it has good development prospects in the field of anti-counterfeiting.

Description

technical field [0001] The invention belongs to the technical field of graphene oxide preparation, in particular to a method for preparing graphene oxide sheets / liquid crystals / films with different numbers of layers. Background technique [0002] Graphene oxide with liquid crystal behavior can self-assemble effectively, and the formed self-assembled material has excellent mechanical strength and good toughness, so it has great application prospects as a building block material. The liquid crystal behavior of single-layer graphene oxide sheets has been reported, but the liquid crystal behavior and self-assembly process of multi-layer and two-layer graphene oxide sheets have not been reported yet. Therefore, the development and utilization of two-layer and multi-layer graphene oxide liquid crystal behavior is beneficial to the effective utilization of resources and has great economic and social significance. Contents of the invention [0003] The object of the present inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198C03C17/22
Inventor 许群张建民任玉美
Owner ZHENGZHOU UNIV
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