Preparation method of MXene/cellulose composite aerogel

A composite airgel and cellulose technology, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems that MXene cannot be prepared into airgel materials, low microwave absorption performance, low conductivity, etc., and achieve excellent reflection loss , high absorption, enhanced conductivity

Inactive Publication Date: 2019-04-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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Problems solved by technology

[0004] In order to solve the problem that MXene cannot be prepared as an airgel material, the object of the present invention is to provide a method for preparing a wave-absorbing, lightweight MXene / cellulose composite airgel, which overcomes the MXene / resin wave-absorbing material prepared by traditional techniques Disadvantages of high density, low conductivity, low absorbing performance and narrow absorption

Method used

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  • Preparation method of MXene/cellulose composite aerogel
  • Preparation method of MXene/cellulose composite aerogel
  • Preparation method of MXene/cellulose composite aerogel

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Embodiment 1

[0030] In this embodiment, the preparation method of MXene / cellulose composite aerogel is as follows:

[0031] 1. Named Ti by chemical etching 3 AlC 2 MAX Phase Ceramic Powder Preparation of Ti 3 C 2 . In a typical chemical etching process, the molar ratio of LiF, HCl, HF and water is n(LiF):n(HCl):n(HF):water = 2:3:1:100, in 500 ml poly Gently stir in the acrylic bottle. Then, the Ti 3 AlC 2 Powder (200 nm particle size, 20 g) was gradually added to the mixture and the reaction was kept at 40°C for 10 hours. The resulting product was washed with deionized water and centrifuged 5 times. Finally, the obtained Ti was dried with a vacuum freeze dryer 3 C 2 powder.

[0032]2. The sol-gel preparation of cellulose is carried out by alkali metal sodium hydroxide / urea solution, and the mass ratio of cellulose powder (particle size is 5 microns), NaOH, urea and water is wt% (cellulose): wt% ( NaOH): wt% (urea): wt% (water) = 5:7:12:100, mixed together to form a uniform solu...

Embodiment 2

[0042] In this embodiment, the preparation method of MXene / cellulose composite aerogel is as follows:

[0043] 1. Named Nb by chemical etching 2 Preparation of Nb from AlC MAX Phase Ceramic Powder 2 C, its size is 30 to 300 nanometers in thickness and 100 to 500 nanometers in length. In a typical chemical etching process, the molar ratio of LiF, HCl, HF and water is n(LiF):n(HCl):n(HF):water = 3:4:1:100, in 500 ml poly Gently stir in the acrylic bottle. Then, the Nb 2 AlC powder (particle size 180 nm, 30 g) was gradually added to the mixture and the reaction was kept at 30°C for 20 hours. The resulting product was washed with deionized water and centrifuged 5 times. Finally, the obtained Nb was dried with a vacuum freeze dryer 2 C powder.

[0044] 2. The sol-gel preparation of cellulose is carried out by alkali metal sodium hydroxide / urea solution, and the mass ratio of cellulose powder (particle size is 100 microns), NaOH, urea and water is wt% (cellulose): wt% ( NaOH...

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Abstract

The invention relates to the field of aerogel and electromagnetic absorbing materials, in particular to a preparation method of MXene/cellulose composite aerogel. The preparation method includes the steps that firstly, MAX phase ceramic powder is added into a mixed water solution of lithium fluoride, hydrochloric acid and hydrofluoric acid in a certain proportion for etching to obtain MXene nano-powder; a cellulose sol method is adopted, cellulose powder is added into a mixed water solution of sodium hydroxide and urea in a certain proportion, and a transparent cellulose mixed solution is prepared by cooling the mixture to -12 DEG C; the temperature is maintained, the MXene nano-powder is added into the cellulose mixed solution, and then the appropriate amount of epichlorohydrin is added to the mixture and the mixture is stirred thoroughly for chemical crosslinking; the temperature is raised, and the obtained homogeneous mixture is subjected to a gel reaction; and a gel product is frozen directionally and then freeze-dried to obtain the MXene/cellulose composite aerogel. The composite aerogel has the characteristics of low density, high porosity, good absorbing performance, wide absorbing frequency band and the like, and is convenient to use and suitable for large-scale application in the aerospace field.

Description

technical field [0001] The invention relates to the field of aerogels and electromagnetic wave absorbing materials, in particular to a preparation method of an MXene / cellulose composite aerogel. Background technique [0002] Excessive electromagnetic wave radiation interferes with electronic devices and affects human health. High-performance microwave absorbing materials have received more and more attention due to their ability to dissipate electromagnetic microwave radiation. It is generally believed that an ideal electromagnetic wave absorbing material should meet the strict requirements of light weight, absorption bandwidth and high absorption efficiency. The layered ternary ceramic MAX phase (such as Ti 2 AlC, Nb 2 AlC, etc.) in the metal layer (such as: aluminum, etc.) to prepare functionalized transition metal carbide nanosheets MXene. Studies have shown that this material has excellent properties such as thermoelectric conversion and electrochemical energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08J3/075
CPCC08J3/075C08J3/24C08J9/28C08J2301/02C08K7/00C08K2201/011H05K9/0081
Inventor 杨锐谢曦崔玉友柏春光
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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