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Carbon nanofiber aerogel as well as preparation method and application thereof

A carbon nanofiber and aerogel technology, which is applied in the field of nanomaterials to achieve the effects of good lipophilicity, cheap and easy-to-obtain raw materials, and convenient storage and transportation.

Active Publication Date: 2013-04-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the use of bacterial cellulose to prepare ultra-light, elastic and fire-resistant carbon nanofiber aerogels.

Method used

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  • Carbon nanofiber aerogel as well as preparation method and application thereof
  • Carbon nanofiber aerogel as well as preparation method and application thereof
  • Carbon nanofiber aerogel as well as preparation method and application thereof

Examples

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preparation example Construction

[0034] The invention discloses a preparation method of carbon nanofiber airgel, comprising the following steps:

[0035] Step a) soaking the bacterial cellulose block in deionized water to remove acid to obtain a neutral bacterial cellulose block. The function of this step is to remove the acid liquid in the bacterial cellulose block, so as to prevent the acidic substance from reacting with the bacterial cellulose airgel in the subsequent high-temperature pyrolysis step. Since bacterial cellulose has a three-dimensional network structure and can be produced on a large scale, it is an ideal precursor for preparing carbon nanofiber aerogels. In order to make the pH value of the bacterial cellulose block close to neutral, the bacterial cellulose block may preferably be soaked in deionized water which is replaced every day for 3-7 days, more preferably for 5-6 days. Those skilled in the art can easily imagine that for the convenience of subsequent operations, the bacterial cellul...

Embodiment 1

[0043] Take a commercially purchased 320×240×12mm 3 Large pieces of bacterial cellulose were soaked in deionized water for 5 days, and the deionized water was replaced every day. Cut the large piece of neutral bacterial cellulose after deacidification into 50×20×12mm 3 The small pieces are ready to use.

[0044] The small pieces of neutral bacterial cellulose were frozen with liquid nitrogen for 25 minutes, and then transferred to a freeze dryer for 4 days to dry.

[0045] The BC airgel obtained by freeze-drying was placed in a ceramic boat and then transferred to a tube furnace. Pyrolysis under argon atmosphere, starting from room temperature at 20°C, heating at a rate of 2°C / min, reaching 500°C after 4 hours, keeping at 500°C for 1 hour, and then heating at a rate of 5°C / min to 1300°C, at Keep at 1300°C for 2 hours to fully pyrolyze. Then cool down to 500°C at 5°C / min, and finally cool down naturally to obtain black carbon nanofiber airgel.

[0046] The density of the p...

Embodiment 2

[0049] Take a commercially purchased 320×240×12mm 3 Large pieces of bacterial cellulose were soaked in deionized water for 4 days, and the deionized water was changed every day. Cut the large piece of neutral bacterial cellulose after deacidification into 50×20×12mm 3 The small pieces are ready to use.

[0050] The small pieces of neutral bacterial cellulose were frozen with liquid nitrogen for 20 minutes, and then transferred to a freeze dryer to dry for 5 days.

[0051] The BC airgel obtained by freeze-drying was placed in a ceramic boat and then transferred to a tube furnace. Pyrolysis under nitrogen atmosphere, starting from room temperature 20°C, heating up to 400°C at a rate of 1°C / min, keeping at 400°C for 2 hours, then raising the temperature to 1000°C at a rate of 4°C / min, and keeping at 1000°C for 3 hours to fully decompose. Then cool down to 500°C at 4°C / min, and finally cool down naturally to obtain black carbon nanofiber airgel.

[0052] Such as image 3 As ...

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Abstract

The invention provides a carbon nanofiber aerogel as well as a preparation method and the application of the carbon nanofiber aerogel. The method comprises the following steps: a), obtaining neutral bacterial cellulose blocks by soaking bacterial cellulose blocks into deionized water for deacidification; b), using liquid nitrogen to refrigerate the neutral bacterial cellulose blocks and drying in a freeze dryer to obtain a bacterial cellulose aerogel; and c), warming the bacterial cellulose aerogel and performing high-temperature pyrolysis to obtain the carbon nanofiber aerogel. The preparation method for the carbon nanofiber aerogel, provided by the invention, is simple, feasible and good in repeatability, and the raw material is cheap and easy to obtain, so that large-scale preparation can be realized easily; the carbon nanofiber aerogel prepared by the invention has good lipophilicity and facilitates adsorbing raw oil and chemical reagent during raw oil pollution and chemical reagent leakage; and in addition, as the carbon nanofiber aerogel has electrical conductivity and elasticity, the carbon nanofiber aerogel can be further used for preparing a pressure sensor.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a carbon nanofiber aerogel and a preparation method and application thereof. Background technique [0002] Carbon airgel, which is composed of a three-dimensional network structure, has many excellent physical properties such as low density, large specific surface area, high electrical conductivity and porosity, and is a new material that has attracted extensive attention. Carbon aerogels can be used as catalyst supports, artificial muscles, electrodes of supercapacitors, absorbents and gas detectors, especially ultra-light or elastic carbon aerogels have great application prospects. For example, ultra-light nitrogen-doped graphene structures are used as absorbers and supercapacitor electrodes, exhibiting a large absorption capacity and special capacitance; elastic conductors based on elastic graphene foams can withstand stretching and bending The electrical conductivity a...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 俞书宏吴振禹李超
Owner UNIV OF SCI & TECH OF CHINA
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