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Dispersion method of graphene

A graphene dispersion, graphene technology, applied in graphene, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of high cost, poor dispersion stability, low graphene concentration, etc., and achieve low cost and simple method. , a wide range of effects

Inactive Publication Date: 2019-01-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these dispersants have problems such as high toxicity, poor dispersion effect, low graphene concentration, poor dispersion stability and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 1.0g alkali lignin and dissolve in 50.0mL sodium hydroxide aqueous solution, add 1.0g graphene powder. After magnetic stirring at room temperature for 24 hours, then 200W ultrasonic dispersion for 12 hours, finally neutralized with hydrochloric acid and filtered, the filter cake was vacuum-dried to obtain lignin / graphene composite powder.

[0032] Disperse the lignin / graphene composite powder in the aqueous solution of sodium hydroxide according to different concentrations, ultrasonically disperse for 0.5h, and test its dispersion effect in the aqueous solution of sodium hydroxide, as shown in Table 1. As can be seen from Table 1, pure graphene powder cannot be dispersed in the aqueous solution of sodium hydroxide, and when the concentration of lignin / graphene composite powder (pH value is 8-10) in the aqueous solution of sodium hydroxide is less than or When it is equal to 10 mg / mL, a stable graphene dispersion can be formed in an aqueous solution of sodium hydrox...

Embodiment 2

[0036] Take 2.0g alkali lignin and dissolve in 50.0mL formaldehyde solution, add 1.0g graphene powder. After magnetic stirring at room temperature for 6 hours, 200W ultrasonic dispersion was performed for 12 hours, the dispersion was precipitated with isopropanol and then filtered, and the filter cake was vacuum-dried to obtain a lignin / graphene composite powder.

[0037] The lignin / graphene composite powder was added to the aqueous solution of sodium hydroxide according to different concentrations, ultrasonically dispersed for 0.5h, and its dispersion effect in the solution was tested, as shown in Table 2. As can be seen from Table 2, pure graphene powder cannot be dispersed in the aqueous solution of sodium hydroxide, and when the concentration of lignin / graphene composite powder (pH value is 8-10) in the aqueous solution of sodium hydroxide is less than or When it is equal to 15 mg / mL, a stable graphene dispersion can be formed in an aqueous solution of sodium hydroxide.

...

Embodiment 3

[0041] Take 1.0g sodium lignosulfonate and dissolve it in 50.0mL deionized water, add 2.0g graphene powder. After magnetic stirring at room temperature for 6 hours, 150W ultrasonic dispersion was performed for 12 hours, the dispersion was precipitated with isopropanol and then filtered, and the filter cake was vacuum-dried to obtain a lignin / graphene composite powder.

[0042] Add the lignin / graphene composite powder to deionized water according to different concentrations, ultrasonically disperse for 0.5h, and check its dispersion effect in the solution, as shown in Table 3 and figure 1 shown. from Table 3 and figure 1 It can be known that pure graphene powder cannot be dispersed in water, but when the concentration of lignin / graphene composite powder in water is less than or equal to 15 mg / mL, a stable graphene dispersion can be formed in water.

[0043] Table 3. Dispersion effect of lignin / graphene composite powder in water

[0044]

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Abstract

The invention discloses a dispersion method of graphene. The method includes the steps of: dissolving lignin in a first solvent to obtain a lignin solution; adding a certain amount of graphene into the lignin solution, and conducting dispersion, filtering and drying to obtain lignin / graphene composite powder; and adding the lignin / graphene composite powder into a second solvent, and performing dispersion to obtain a graphene dispersion. The method provided by the invention utilizes lignin as the dispersant, realizes redispersion of graphene, and can acquire the high concentration and high stability graphene dispersion. Moreover, as a dispersant, lignin has extensive sources, belongs to green and renewable resources, and does not cause environmental pollution.

Description

technical field [0001] The invention relates to a graphene dispersion method. Background technique [0002] Graphene is a two-dimensional material with a single-layer sheet structure, its thickness is only one atomic diameter (about 0.35nm), because of its large specific surface area, high thermal conductivity, low resistivity, and impermeability And other characteristics have received extensive attention from the scientific community, and are expected to become a new generation of revolutionary materials. However, the large specific surface area and strong van der Waals force of graphene make it prone to irreversible agglomeration in the dispersed matrix. The fundamental reason for the use of graphene lies in its excellent performance, which can only be reflected on single sheets / primary particles to a great extent, while the performance of graphene after agglomeration is greatly reduced or even completely lost. In order to improve the dispersion of graphene in solvents s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194
CPCC01B2204/20C01P2002/01C01P2004/04
Inventor 余海斌丁纪恒周楠彭晚军
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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