Preparation method of lamellar porous graphene oxide and product of preparation method

A technology of graphene and sheets, which is applied in the field of preparation of sheet-layer porous graphene oxide, can solve the problems of irregular nucleation process and limited application of directional freezing method, and achieve the effect of low cost, sufficient raw materials, and simple preparation method

Active Publication Date: 2016-06-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, due to the existence of a single temperature gradient in the traditional directional freezing method, the nucleation process of ice crystals on the bottom surface of the crystal is random, resulting in multi-dimensional small-scale orientations on the section perpendicular to the freezing direction.
This shortcoming severely limits the application of directional freezing for applications requiring large-area oriented lamellar porous structures

Method used

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  • Preparation method of lamellar porous graphene oxide and product of preparation method
  • Preparation method of lamellar porous graphene oxide and product of preparation method
  • Preparation method of lamellar porous graphene oxide and product of preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Dissolve 20mgGO and 10mgPVA in 4mlH at 20°C 2 O, Ultrasound in an ultrasonic cell pulverizer for 5 minutes to fully dissolve, and vacuum remove air bubbles to obtain a homogeneous solution, wherein the concentration of GO in the solution is 5.0mg / mL, and the concentration of the binder in the solution is 2.5mg / mL;

[0050] (2) Place the solution obtained in step (1) in a container with a wedge-shaped silicone rubber device. The slope of the wedge-shaped silicone rubber device is 15°, and use frozen ethanol (-90°C) as the cold source to perform two-way freezing to obtain the intermediate product;

[0051] (3) Freeze-drying the intermediate product obtained in step (2) for 24 hours to remove the solvent to obtain lamellar porous graphene oxide, which has a regular layered porous structure with large-area orientation.

Embodiment 2

[0053] (1) Dissolve 20mgGO and 20mgPVA in 4mlH at 20°C 2 O, Ultrasound in an ultrasonic cell pulverizer for 5 minutes to fully dissolve, and vacuum remove air bubbles to obtain a homogeneous solution, wherein the concentration of GO in the solution is 5.0 mg / mL, and the concentration of the binder in the solution is 5.0 mg / mL;

[0054] (2) Place the solution obtained in step (1) in a container with a wedge-shaped silicone rubber device. The slope of the wedge-shaped silicone rubber device is 15°, and use frozen ethanol (-90°C) as the cold source to perform two-way freezing to obtain the intermediate product;

[0055] (3) Freeze-drying the intermediate product obtained in step (2) for 24 hours to remove the solvent to obtain porous graphene oxide, which has a regular layered porous structure with large-area orientation.

Embodiment 3

[0057] (1) Dissolve 20mgGO and 40mgPVA in 4mlH at 20°C 2 O, Ultrasound in an ultrasonic cell pulverizer for 5 minutes to fully dissolve, remove air bubbles in a vacuum to obtain a homogeneous solution, wherein the concentration of GO in the solution is 5.0mg / mL, and the concentration of the binder in the solution is 10.0mg / mL;

[0058] (2) The solution obtained in step (1) is placed in a container with a wedge-shaped silicone rubber device, the slope of the wedge-shaped silicone rubber device is 15°, and it is subjected to two-way freezing with frozen ethanol (-90° C.) as a cold source to obtain mid product;

[0059] (3) Freeze-drying the intermediate product obtained in step (2) for 24 hours to remove the solvent to obtain porous graphene oxide, which has a regular layered porous structure with large-area orientation.

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Abstract

The invention relates to a preparation method of lamellar porous graphene oxide. The preparation method comprises the following steps: (1) dissolving graphene oxide and a binding agent into water to prepare a precursor solution; (2) putting the precursor solution into a container and carrying out a bidirectional freezing reaction to obtain an intermediate product, wherein a wedge-shaped device is arranged at the bottom of the container; (3) freezing and drying the intermediate product obtained by the step (2) to remove a solvent, so as to obtain the lamellar porous graphene oxide. The invention further relates to the lamellar porous graphene oxide. The method is simple to operate; the lamellar porous graphene oxide prepared by a bidirectional freezing method has a regular large-area and biaxial orientated lamellar porous structure.

Description

technical field [0001] The invention relates to the field of preparation of porous materials, in particular to a method for preparing sheet-layer porous graphene oxide and its products. Background technique [0002] Porous material is a material with a network structure of interpenetrating or closed pores, mainly composed of a continuous solid phase forming the basic framework of the material itself and a fluid phase forming pores. Compared with continuum materials, porous materials generally have the advantages of low relative density, high specific strength, high specific surface area, sound insulation, heat insulation, and good permeability. Its application scope is far beyond single-functional materials, and it has important applications in tissue engineering, catalyst carrier, adsorption carrier, barrier material, foam material, separation filter material, electrode material, etc., and is gradually attracting people's attention. [0003] According to the size of the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/04C01B2204/32C01P2004/03
Inventor 杨苗高微微赵骞谢涛柏浩
Owner ZHEJIANG UNIV
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