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Method for controlled preparation of graphene fibers by using microfluidic technology

A graphene fiber and microfluidic technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, rayon chemical post-treatment, etc., can solve the problems of controllable fiber micro-morphology, achieve good uniformity, good continuity, The effect of high yield

Active Publication Date: 2019-11-29
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no microfluidic spinning method that can control the microscopic morphology of the prepared fibers and have good mechanical properties.

Method used

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  • Method for controlled preparation of graphene fibers by using microfluidic technology
  • Method for controlled preparation of graphene fibers by using microfluidic technology
  • Method for controlled preparation of graphene fibers by using microfluidic technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The inner phase is a graphene oxide aqueous solution with a mass concentration of 10 mg / mL, and the outer phase is a mixed solution of water / ethanol (volume ratio 1:4) with a mass fraction of calcium chloride of 10%. d 1 600μm, d 2 is 400 μm; the inner diameter of the external phase channel is 800 μm. The flow rate of the internal phase fluid is 4mL / h, and the flow rate of the external phase fluid is 20mL / h. The internal phase solution is passed into the internal phase channel 1 to control the internal and external phase flow rate. As time goes on, the graphene oxide aqueous solution passed into the internal phase channel 1 flows into the external phase In the channel, solidify under the action of the external phase fluid to obtain continuous gel-like graphene oxide fibers, and then pass it into a mixed solution of water / ethanol (volume ratio 1:4) with a mass fraction of calcium chloride of 10% , soaked for 30 minutes, took out the fibers, washed them with ethanol and...

Embodiment 2

[0043] The inner phase is a graphene oxide aqueous solution with a mass concentration of 10 mg / mL, and the outer phase is a mixed solution of water / ethanol (volume ratio 1:4) with a mass fraction of calcium chloride of 10%. d 1 600μm, d 2 is 400 μm; the inner diameter of the external phase channel is 800 μm. The flow rate of the internal phase fluid is 3mL / h, the flow rate of the external phase fluid is 18mL / h, and the internal phase is passed into the internal phase channel 1 to obtain continuous gel-like graphene oxide fibers, which are then passed into a calcium chloride with a mass fraction of 10%. Soak in water / ethanol (volume ratio: 1:4) mixed solution for 30 minutes, take out the fiber, wash with ethanol and deionized water respectively, and vacuum dry at 60°C for 2 hours to obtain dry continuous graphene oxide fiber. Finally, immerse the obtained graphene oxide fibers in a hydroiodic acid solution with a mass concentration of 40%, react at 90°C for 4h, wash with etha...

Embodiment 3

[0045] The inner phase is a graphene oxide aqueous solution with a mass concentration of 10 mg / mL, and the outer phase is a mixed solution of water / ethanol (volume ratio 1:4) with a mass fraction of calcium chloride of 10%. d 1 600μm, d 2 is 200 μm; the inner diameter of the external phase channel is 800 μm. The flow rate of the internal phase fluid is 4mL / h, the flow rate of the external phase fluid is 20mL / h, and the internal phase is passed into the internal phase channel 1 to obtain continuous gel-like graphene oxide fibers, which are then passed into a calcium chloride with a mass fraction of 10%. Soak in water / ethanol (volume ratio: 1:4) mixed solution for 30 minutes, take out the fiber, wash with ethanol and deionized water respectively, and vacuum dry at 60°C for 2 hours to obtain dry continuous graphene oxide fiber. Finally, immerse the obtained graphene oxide fibers in a hydroiodic acid solution with a mass concentration of 40%, react at 90°C for 4h, wash with etha...

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Abstract

The invention relates to a method for preparation of graphene fibers. The method includes the following steps that a microfluidic chip is used for microfluidic spinning of a graphene oxide aqueous solution to obtain graphene oxide fibers; the graphene oxide fibers react under the action of a reducing agent at a reaction temperature of 90 DEG C to obtain the graphene fibers; the microfluidic chip includes an internal phase channel and an external phase channel, the internal phase channel is provided with an internal phase channel outlet, and the internal phase channel is in fluid communicationwith the external phase channel through the internal phase channel outlet; a method for microfluidic spinning includes the steps that the graphene oxide aqueous solution and coagulation liquid are introduced into the internal phase channel and the external phase channel respectively, and the graphene oxide aqueous solution flows into the external phase channel through the internal phase channel outlet, and solidifies under the action of the coagulation liquid to obtain the graphene oxide fibers. By adopting the method, controlled preparation of the graphene fibers is achieved by using a microfluidic technology; the method can be used for preparing the graphene fibers with an ordered microstructure arrangement and good mechanical properties and continuous properties.

Description

technical field [0001] The invention relates to the field of microfluidic technology and the technical field of graphene fiber preparation, in particular to a method for controllably preparing graphene fiber using microfluidic technology. Background technique [0002] Graphene has been widely used to prepare high-performance multifunctional materials because of its excellent mechanical, electrical, and thermal properties. Graphene fiber material is an important field to realize the functional application of graphene. The preparation process of pure graphene fibers is difficult and the preparation conditions are harsh, which is not conducive to large-scale preparation. Graphene oxide is a graphene derivative obtained from graphite through oxidative intercalation. functional materials. The liquid crystal phase behavior exhibited by the high-concentration graphene oxide solution provides the possibility for the preparation and further processing of graphene oxide fibers into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/12D01F9/32D01F11/12
CPCD01F9/12D01F9/32D01F11/121
Inventor 张克勤尹菲胡建臣
Owner SUZHOU UNIV
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