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Preparation method of carbon-based nano fiber

A technology of carbon-based nanofibers and nanofibers, applied in fiber processing, spinning solution preparation, fiber chemical characteristics, etc., can solve the problems of limited application, large performance, and lack of specific surface area of ​​nanofibers, and achieve the effect of high surface area

Inactive Publication Date: 2014-03-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary spinning produces thick fibers larger than 20 microns, which do not have the properties of many nanomaterials such as the large specific surface area of ​​nanofibers, which limits their applications in sensing and display.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add 100g of graphite powder, 3L of 98% concentrated sulfuric acid, and 1L of fuming nitric acid to a 500mL flask and stir at room temperature for 24 hours. The above mixture was then slowly added to 20 L of water and filtered to obtain a solid. The solid was washed three times with water and then dried at 60°C for 24 hours to obtain a graphite intercalation compound. The dried graphite intercalation compound powder was treated at 1000°C for 10 seconds to obtain expanded graphite.

[0019] (2) Add 100g of expanded graphite, 6L of concentrated sulfuric acid, 84g of potassium persulfate and 124g of phosphorus pentoxide into a 10L flask in sequence and react at 80°C for 5 hours. After cooling to room temperature, the mixture was diluted with 40 L of water and vacuum filtered through a 0.22 μm polyester porous membrane. The solid was dried at room temperature for two days.

[0020] (3) Add the pre-oxidized expanded graphite into 4L of concentrated sulfuric acid at 0°C...

Embodiment 2

[0023] Dry expanded graphite sheets were first treated at 1050 °C for 15 seconds. Subsequently, 50 g of expanded graphite and 10 L of sulfuric acid were mixed and stirred in the reaction flask for 24 hours. Then 500 g of potassium permanganate were added dropwise. The mixture was transferred to an ice bath, and 10 L of double distilled water and 2500 mL of hydrogen peroxide were slowly added, so that the color of the suspension changed to light brown. Stir for an additional 30 minutes. Then wash and centrifuge with 9:1 hydrochloric acid aqueous solution, then wash and centrifuge with double distilled water until the pH value of the solution is between 5-6. The obtained graphene oxide sheets were dispersed in deionized water by gently shaking to obtain an aqueous liquid crystal graphene oxide solution having a concentration of 2.5 mg / mL.

[0024] Subsequently, 30 mL of a 2.5 mg / mL liquid crystal graphene oxide aqueous solution was poured into a 100 mL centrifuge tube contain...

Embodiment 3

[0026] First prepare 3mg / mL of graphene oxide aqueous solution with nematic phase characteristics, then place it in a vertically fixed 5mL syringe, the syringe uses a No. 6 needle, and a stainless steel sheet with a diameter of 3cm is fixed behind the needle nozzle to control Electrospinning was collected in an area approximately 4-6 cm in diameter directly below it. A 35 cm diameter plastic basin with a hole in the bottom center was placed 12 cm from the syringe needle. There is a calcium chloride aqueous solution with a concentration of 5wt% in the plastic basin, and the calcium chloride aqueous solution moves downwards spirally around the center of the basin due to the holes at the bottom of the plastic basin. There is a non-porous plastic basin of 5wt% calcium chloride aqueous solution under the porous plastic basin and the calcium chloride aqueous solution in the lower plastic basin is pumped into the upper plastic basin by a pump to keep the spiral motion in the upper pl...

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Abstract

The invention relates to a preparation method of carbon-based nano fiber. The method comprises the steps of firstly, preparing graphene oxide into nematic phase solution, and then preparing the nematic phase solution into a carbon-based nano-fiber film or a carbon-based nano-fiber bundle by an electrospinning technique. The method adopts the nematic phase graphene oxide solution as raw material, and the carbon-based nano-fiber can be prepared by the electrospinning technique; the nematic phase solution can be easily arranged in order in the preparation process of the nano fiber, so that the defects of performances in the aspects of mechanical strength, electric conduction, heat conduction and the like caused by the low orderly arrangement degree of the fiber since the electrospinning material is not sufficiently stretched in the electrospinning technique can be well overcome; therefore, the graphene oxide and the carbon-based nano fiber can be well further popularized and applied.

Description

technical field [0001] The invention relates to a method for preparing carbon-based nanofibers, in particular to preparing graphene oxide-based carbon-based nanofibers through electrospinning technology after constructing a nematic liquid crystal solution into nanofibers. Background technique [0002] Carbon-based nanofibers have a wide range of application potentials in the fields of sensing and separation due to their electrical conductivity and stability, and have attracted great attention. At present, the preparation of carbon-based nanofibers is mainly obtained by preparing materials including polyacrylonitrile and polyvinyl alcohol through electrospinning technology into nanofiber films and then carbonizing at high temperature, or by preparing polymers with added carbon nanotubes or graphene. composite nanofibers. Nanofibers prepared by electrospinning technology are widely used in nanofiber base membranes, biomedical fields, enzyme and catalyst carriers, nanofiber se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/12D01D5/00D01D1/02
Inventor 张继中
Owner SOUTHEAST UNIV
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