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Anisotropic nano-cellulose aerogel and preparation method and device thereof

A nanocellulose, anisotropic technology, applied in the field of material science, can solve the problems of long transmission path, disordered microporous structure, and reduced application performance of materials, and achieve good mechanical compression resistance, good stability, and high porosity. rate effect

Inactive Publication Date: 2019-08-27
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, nanocellulose airgel is generally obtained by sol-gel method or low-temperature freeze-drying, and its microporous structure is usually in a disordered state.
This disordered pore structure makes airgel materials unable to achieve directional mass transfer, heat transfer, electrical conductivity and other functional applications, and at the same time, due to its long transmission path, the application performance of the material is reduced
In addition, compared with the three-dimensional ordered structure, the properties of disordered nanocellulose aerogels are also uncontrollable.

Method used

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specific Embodiment 1

[0031] A preparation method of anisotropic nano-cellulose airgel, comprising the following steps:

[0032] Step 1, ultrasonically dispersing the nanocellulose prepared by the TEMPO oxidation method into water to obtain a nanocellulose dispersion. Among them, the specific steps for the preparation of TEMPO oxidation method are: put deionized water (500mL) in a beaker, add 0.08g of TEMPO, 0.5g of NaBr, and 7g of wood pulp fibers in turn, and mix and stir for 20min on a heating type magnetic stirrer . Add a certain volume of 10% NaClO solution. Then adjust the pH of the system with 0.2 mol / L hydrochloric acid solution, and continue stirring at room temperature. During the reaction process, 0.3 mol / L sodium hydroxide solution was continuously added dropwise to maintain the system pH=11 until the sodium hydroxide was no longer consumed, and 5 mL of ethanol was added to terminate the reaction. The product was washed with deionized water several times to neutrality, an appropriate...

specific Embodiment 2

[0036] A preparation method of anisotropic nano-cellulose airgel, comprising the following steps:

[0037] Step 1, ultrasonically dispersing the nanocellulose prepared by the TEMPO oxidation method into water to obtain a nanocellulose dispersion. Among them, the specific steps for the preparation of TEMPO oxidation method are: put deionized water (400mL) in a beaker, add 0.08g of TEMPO, 0.5g of NaBr, and 5g of wood pulp fiber in turn, and mix and stir for 20min on a heating type magnetic stirrer . Add a certain volume of 10% NaClO solution. Then adjust the pH of the system with 0.4 mol / L hydrochloric acid solution, and continue stirring at room temperature. During the reaction process, 0.4 mol / L sodium hydroxide solution was continuously added dropwise to maintain the system pH=10 until the sodium hydroxide was no longer consumed, and 15 mL of ethanol was added to terminate the reaction. The product was washed with deionized water several times to neutrality, an appropriate...

specific Embodiment 3

[0041] A preparation method of anisotropic nano-cellulose airgel, comprising the following steps:

[0042] Step 1, ultrasonically dispersing the nanocellulose prepared by the TEMPO oxidation method into water to obtain a nanocellulose dispersion. Among them, the specific steps for the preparation of TEMPO oxidation method are: put deionized water (500mL) in a beaker, add 0.08g of TEMPO, 0.5g of NaBr, and 2g of wood pulp fiber in turn, and mix and stir for 20min on a heating type magnetic stirrer. . Add a certain volume of 10% NaClO solution. Then adjust the pH of the system with 0.2 mol / L hydrochloric acid solution, and continue stirring at room temperature. During the reaction process, 0.1 mol / L sodium hydroxide solution was continuously added dropwise to maintain the system pH=9 until the sodium hydroxide was no longer consumed, and 10 mL of ethanol was added to terminate the reaction. The product was washed with deionized water several times to neutrality, an appropriate...

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Abstract

The invention discloses a preparation method of an anisotropic nano-cellulose aerogel. The preparation method comprises the following steps that S01, nano-cellulose prepared by using a TEMPO oxidationmethod is ultrasonically dispersed into water to obtain a nano-cellulose dispersion liquid; S02, the nano-cellulose dispersion liquid obtained in the S01 is directionally frozen with a freezing agentas a cold source; S03, the frozen sample obtained in the S02 is put into a drying machine to be dried. The invention further discloses the anisotropic nano-cellulose aerogel. The anisotropic nano-cellulose aerogel is prepared by using the preparation method. The invention further discloses a preparation device of the anisotropic nano-cellulose aerogel. According to the anisotropic nano-celluloseaerogel and the preparation method and device thereof, the nano-cellulose aerogel prepared by using the method has an anisotropic and orderly distributed micro-pore structure, and it is expected thatthe anisotropic nano-cellulose aerogel is applied to selective directional medium transfer of aerogel materials.

Description

technical field [0001] The invention relates to an anisotropic nano-cellulose airgel and a preparation method and device thereof, belonging to the field of material science. Background technique [0002] Airgel is a new type of material with nano-porous structure, which has the characteristics of high specific surface area, large porosity, low thermal conductivity, etc. It has a wide range of applications and has become a hot spot of common exploration at home and abroad. However, traditional silica, alumina, tin dioxide, and carbon aerogels often have disadvantages such as greater brittleness, poor flexibility, and easy collapse under low pressure, which makes researchers start looking for Novel alternative materials and methods for preparing aerogels. Nanocellulose is an ultrafine fiber with a diameter of nanoscale and a certain aspect ratio. It has many special excellent properties, such as high specific surface area, high tensile strength, high degree of polymerization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08B15/02C08J9/28
CPCC08B15/02C08J9/28C08J2201/0484C08J2301/04
Inventor 蒋少华陈一鸣梅长彤周丽洁陈炼胡奕萱杨智夏冬冬
Owner NANJING FORESTRY UNIV
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