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
View PDF0 Cites 66 Cited by
  • 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 prep

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] The invention discloses a preparation method of carbon nanofiber aerogel, which comprises the following steps:

[0035] Step a) Soak 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 to prevent the acidic substance from reacting with the bacterial cellulose aerogel 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 that 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 cellulose blo...

Example Embodiment

[0042] Example 1

[0043] Take a commercially purchased 320×240×12mm 3 Bacterial cellulose flakes, soak in deionized water for 5 days, and replace the deionized water every day. Cut the large pieces of neutral bacterial cellulose after deacidification into 50×20×12mm 3 The small pieces are ready for use.

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

[0045] The bacterial cellulose aerogel obtained by freeze drying was placed in a ceramic boat, and then transferred to a tube furnace. Pyrolysis in an argon atmosphere, starting from room temperature 20°C, heating at a rate of 2°C / min, reaching 500°C after 4h, holding at 500°C for 1h, and then heating up to 1300°C at a rate of 5°C / min. Keep at 1300℃ for 2h to fully pyrolyze. Then the temperature is lowered to 500°C at 5°C / min, and finally the temperature is naturally lowered to obtain a black carbon nanofiber aerogel.

[0046] ...

Example Embodiment

[0048] Example 2

[0049] Take a commercially purchased 320×240×12mm 3 Bacterial cellulose flakes, soak in deionized water for 4 days, and replace the deionized water every day. Cut the large pieces of neutral bacterial cellulose after deacidification into 50×20×12mm 3 The small pieces are ready for use.

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

[0051] The bacterial cellulose aerogel obtained by freeze drying was placed in a ceramic boat, and then transferred to a tube furnace. Pyrolysis in a nitrogen atmosphere, starting from room temperature 20°C, heating at a rate of 1°C / min to 400°C, holding at 400°C for 2h, then heating at a rate of 4°C / min to 1000°C, and keeping it at 1000°C for 3h Come full pyrolysis. Then the temperature is lowered to 500°C at 4°C / min, and finally the temperature is naturally lowered to obtain a black carbon nanofiber aerogel.

[0052] Such as ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Densityaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/66
Inventor 俞书宏吴振禹李超
Owner UNIV OF SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap