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Preparation method of chiral helical carbon fiber

A technology of spiral carbon fiber and carbon fiber, which is applied to the chemical characteristics of fibers, textiles and papermaking, etc., can solve problems such as difficult control and complex conditions, and achieve the effects of easy control of the process, simple preparation process, and prevention of hard agglomeration

Inactive Publication Date: 2005-04-06
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the current preparation mainly relies on doping impurities such as sulfur in the catalyst and introducing impure gas, the conditions are extremely complicated and difficult to control

Method used

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  • Preparation method of chiral helical carbon fiber
  • Preparation method of chiral helical carbon fiber
  • Preparation method of chiral helical carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: under strong stirring, 0.01mol FeCl 2 4H 2 O and 0.015mol citric acid were dissolved in 100mL of absolute ethanol, and stirred continuously at 60°C for 6 hours to form a uniform transparent sol; evaporated and dried at 80°C until a xerogel was formed; the xerogel was pre-baked at 450°C in air for 3 hours, and then Place it in a tube furnace in a hydrogen atmosphere at 450°C for 4 hours for reduction. Then turn off the hydrogen, immediately introduce acetylene gas, keep warm at 450°C for six hours, and then cool to room temperature. The obtained carbon fiber electron microscope observation results are shown in figure 1, Field emission scanning electron microscope observation results see Figure 2 and Infrared analysis see image 3.

Embodiment 2

[0016] Example 2: under strong stirring, 0.01mol FeCl 2 4H 2 O and 0.015mol citric acid were dissolved in 100mL of absolute ethanol, and stirred continuously at 60°C for 6 hours to form a uniform transparent sol; evaporated and dried at 80°C until a xerogel was formed; the xerogel was pre-baked at 450°C in air for 3 hours, and then Place it in a tube furnace in a hydrogen atmosphere at 450°C for 4 hours for reduction. After that, the temperature was raised rapidly to 700°C, then the hydrogen gas was turned off, and acetylene gas was immediately introduced, kept at 700°C for six hours, and then cooled to room temperature. The obtained carbon fiber electron microscope observation results are shown in Figure 4.

Embodiment 3

[0017] Example 3: Common iron oxide nanoparticles were used as the catalyst precursor, and then placed in a tube furnace for reduction at 450° C. for 4 hours in a hydrogen atmosphere. Then turn off the hydrogen, immediately introduce acetylene gas, keep warm at 450°C for 5-7 hours, and then cool to room temperature. The obtained carbon fiber electron microscope observation results are shown in Figure 5 .

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Abstract

The chiral spiral carbon fiber assumes take a hard nanometer pellet as the center highly symmetrically grows, carbon fiber particle size approximately for hard pellet diameter. Its preparation method is take the hard oxide compound as the catalyst forerunner, this oxide compound take the ferric chloride or the ferrous sulfate as the raw material, the citric acid is the complexing agent, the absolute ethyl alcohol forms the even non- hydrosol preparation method for the solvent, after the process complexing dryly forms in the air does the gelatin, in the air bakes in advance removes the organic matter to obtain. 450 deg c under returns to original state in the H2 atmosphere namely obtains a Fe nanometer beaded catalyst. The preparation craft simple, the process is easy to control, is suitable the large scale production. The carbon fiber particle size approximately for the hard nanometer pellet diameter, take iron catalyst becomes as the center of symmetry highly symmetrically grows. We law prepares the carbon fiber is highly symmetrical, on each catalyst granule grows two carbon fibers, is a left hand, is a right hand, also the textile fiber diameter, the curl diameter, the curl turn, the growth direction is all same.

Description

1. Technical field [0001] The invention relates to a highly symmetrical chiral nano-helical carbon fiber nano and a preparation method thereof. In particular, iron catalyst nanoparticles and methods for their preparation. 2. Background technology [0002] Since the discovery of chiral helical carbon fibers, many scientists have predicted and confirmed the unique physical and chemical properties of this new carbon structure. The current experiments seem to be far behind the theory because the prepared helices are impure and often contain straight rod structures. And the current preparation mainly depends on doping impurities such as sulfur in the catalyst, and introducing impure gas, the conditions are extremely complicated and difficult to control. Another method is to treat the catalyst precursor with a chiral reagent in advance. This method is a powerful complement to these two methods, and is simpler and easier to control, and the yield of the obtained helix is ​​very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/127
Inventor 汤怒江都有为
Owner NANJING UNIV
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