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A method and device for concentrating a large graphene oxide solution

A technology of stone oxide and graphene, which is applied in the direction of graphene, chemical instruments and methods, carbon compounds, etc., can solve the problems of long centrifugation time and poor centrifugation effect, and achieve the effect of not easy to block holes and beneficial to centrifugation

Active Publication Date: 2020-10-23
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene oxide generally exists in the form of low-concentration dispersions, and its concentration process is still a challenge.
Generally, high-concentration graphene oxide is obtained by high-speed centrifugation of graphene oxide solution. This method requires a high-speed centrifuge, long centrifugation time, and poor centrifugation effect (centrifugation for 1 hour, concentration 20-40mg / mL)

Method used

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  • A method and device for concentrating a large graphene oxide solution
  • A method and device for concentrating a large graphene oxide solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Inject 4mg / mL large-scale graphene oxide aqueous solution at 20m / s into such as figure 2 Among the slits of the shearing device shown, the height of the slit is 1um, and the shearing time is 2min. After shearing, graphene oxide coagulates, such as figure 1 As shown in b, it can be seen that the graphene oxide aggregates have millimeter-scale diameters.

[0016] (2) After dehydration with bag centrifuge (centrifugal force 6000xG) then, obtain the graphene oxide concentrated solution that concentration is 60mg / mL, as figure 1 as shown in c;

[0017] After the above-mentioned graphene oxide concentrate is redispersed in water, the highly dispersed state of the original graphene oxide is maintained, such as figure 1 shown in d.

Embodiment 2

[0019] (1) Inject 3mg / mL large-scale graphene oxide aqueous solution at 100m / s into such as figure 2 Among the slits of the shearing device shown, the height of the slit is 10um, and the shearing time is 2min. After shearing, the graphene oxide coagulates, and the graphene oxide aggregates have millimeter-scale diameters.

[0020] (2) After dehydration with a bag centrifuge (centrifugal force 17000xG) then, the graphene oxide concentrate obtained with a concentration of 100mg / mL;

[0021] After the graphene oxide concentrate is redispersed in water, the original highly dispersed state of graphene oxide is maintained.

Embodiment 3

[0023] (1) 5mg / mL large-scale graphene oxide aqueous solution is injected into such as 40m / s figure 2 Among the slits of the shearing device shown, the height of the slit is 4um, and the shearing time is 1.5min. After shearing, the graphene oxide coagulates, and the graphene oxide aggregates have millimeter-scale diameters.

[0024] (2) After dehydration with a bag centrifuge (centrifugal force 12000xG) then, the graphene oxide concentrate obtained with a concentration of 80mg / mL;

[0025] After the graphene oxide concentrate is redispersed in water, the original highly dispersed state of graphene oxide is maintained.

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Abstract

The invention discloses a method and a system for concentrating a large graphene oxide solution. The large graphene oxide solution flows through a limited space, and is rapidly sheared in order to coagulate graphene oxide. The coagulated graphene oxide is 60 to 100mg / mL in final concentration after being filtered and collected. The coagulated graphene oxide is unfolded slowly under slow cutting, recovers to a uniform structure, and is dispersed in the solution. The method can be applied to rapid continuous concentration of the graphene oxide solution.

Description

technical field [0001] The invention relates to a method for concentrating two-dimensional materials, in particular to a method and device for concentrating a large sheet of graphene oxide solution. Background technique [0002] In 2010, Professor Andre Geim isolated stable graphene for the first time. Graphene has excellent electrical properties (electron mobility at room temperature can reach 2×10 5 m 2 / Vs), outstanding thermal conductivity (5000W / (MK), extraordinary specific surface area (2630M 2 / g), its Young's modulus (1100GPa) and breaking strength (125GPa). The excellent electrical and thermal conductivity of graphene completely exceeds that of metals. At the same time, graphene has the advantages of high temperature resistance and corrosion resistance, and its good mechanical properties and low density make it have the potential to be applied in various fields. [0003] Graphene oxide is the most important precursor of graphene, and it also has excellent physic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198
CPCC01B2204/32
Inventor 高超彭蠡许震郭燕
Owner HANGZHOU GAOXI TECH CO LTD
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