Preparation method of graphene oxide sheet with different layers/liquid crystal/film

A graphene sheet and graphene technology, applied in the field of graphene oxide preparation, can solve the problems that the self-assembly process of graphene oxide sheet has not been reported yet, and achieve good application prospects, simple method, and controllable film size

Active Publication Date: 2015-12-23
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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  • Preparation method of graphene oxide sheet with different layers/liquid crystal/film
  • Preparation method of graphene oxide sheet with different layers/liquid crystal/film
  • Preparation method of graphene oxide sheet with different layers/liquid crystal/film

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; keep the dispersion at 10000r / min constant Centrifuge at the centrifugal speed, extract the bottom layer of the centrifuge tube every 30 minutes and record it as a group of samples, a total of 12 extractions, 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 10,000r / min for 30min, and the lower liquid...

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 the graphite oxide in deionized water evenly; centrifuge the dispersion at 10000r / min Centrifuge at high speed, extract the lower 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 10000r / min for 1h, 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 present invention belongs to the technical field of graphene oxides, and specifically discloses a preparation method of a graphene oxide sheet with different layers / liquid crystal / film. The preparation method comprises: dispersing graphite oxide in a solvent, carrying out an ultrasound treatment, carrying out centrifugation separation, extracting the lower layer liquid in the centrifugation tube every 0.5-3 h and labeling as a group of the samples until the supernatant is colorless and transparent, and removing the solvent from the sample so as to obtain the graphene oxide sheet; carrying out further centrifugation concentration on the graphene oxide sheet, taking the lower layer liquid, and removing the solvent to obtain a graphene oxide liquid crystal; and coating the graphene oxide liquid crystal onto a substrate in a dropwide manner, and drying at a temperature of 15-35 DEG C so as to obtain the graphene oxide film. According to the present invention, with the preparation method, the problems that the graphene oxide sheets with multiple layers, two layers and one layer can not be concurrently and precisely obtained and the liquid crystal phase preparation is complex in the prior art are solved; and the graphene oxide liquid crystal preparation is simple, the raw materials achieve the zero loss, the film assembly period is short, and the obtained film has the optical anti-counterfeiting capability, such that the obtained film has the good development prospects in the anti-counterfeiting field.

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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IPC IPC(8): C01B31/04C03C17/22
Inventor 许群张建民任玉美
Owner ZHENGZHOU UNIV
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