Preparation method of telescopic MXene/graphene composite aerogel with high electromagnetic shielding effect

A graphene composite and electromagnetic shielding technology, which is applied in airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problem that the flexibility of the sheet is not as good as that of graphene, and achieve excellent scalability, simple method, and excellent Effects of conductivity and scalability

Active Publication Date: 2018-10-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, because the flexibility of the MXene sheet is not as good as that of graphene, it is difficult to form a three-dimensional gr

Method used

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  • Preparation method of telescopic MXene/graphene composite aerogel with high electromagnetic shielding effect
  • Preparation method of telescopic MXene/graphene composite aerogel with high electromagnetic shielding effect
  • Preparation method of telescopic MXene/graphene composite aerogel with high electromagnetic shielding effect

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Embodiment 1

[0032] The scalable MXene / graphene composite airgel preparation method with high electromagnetic shielding effect provided by the present embodiment is realized through the following steps:

[0033] Step 1. Prepare reduced graphene oxide to a concentration of 4 mg mL -1 The reduced graphene oxide solution, i.e. solution A.

[0034] Step 2. Etching Ti by hydrofluoric acid 3 AlC 2 To prepare the MXene dispersion, and control its concentration to 1.5 mg mL with deionized water -1 . Mix the MXene dispersion with solution A at a mass ratio of 1:1 to obtain solution B.

[0035] Step 3. The solution B was magnetically stirred at a speed of 600 r / min for 30 minutes and then subjected to ultrasonic treatment for 40 minutes to obtain a solution C with an ultrasonic power of 200 W.

[0036] Step 4. Dissolve polyvinyl alcohol in deionized water, add it to solution C at a ratio of 5 wt%, and then magnetically stir it at 400 r / min for 20 min, and then perform 10 min of ultrasonic power...

Embodiment 2

[0040] The preparation method of the scalable MXene / graphene composite airgel with high electromagnetic shielding effect provided by the present embodiment is realized through the following steps:

[0041] Step 1. Prepare reduced graphene oxide to a concentration of 10 mg mL -1 The reduced graphene oxide solution, i.e. solution A.

[0042] Step 2. Etching Ti by hydrofluoric acid 3 AlC 2 to prepare the MXene dispersion and make up to a concentration of 3 mg mL with deionized water -1 . Mix the MXene dispersion with solution A at a mass ratio of 1:2 to obtain solution B.

[0043] Step 3. The solution B was magnetically stirred at a speed of 300 r / min for 20 minutes, and then ultrasonically treated for 30 minutes to obtain a solution C. The ultrasonic power was 100 W.

[0044] Step 4: Prepare a tris buffer solution with a pH of 8.5, then add solution C, and stir evenly, then add 4 wt% dopamine and stir magnetically at 400 r / min for 20 minutes, and then use 100W ultrasonic U...

Embodiment 3

[0048] The scalable MXene / graphene composite airgel preparation method with high electromagnetic shielding effect provided by the present embodiment is realized through the following steps:

[0049] Step 1. Prepare reduced graphene oxide to a concentration of 6 mg mL -1 The reduced graphene oxide solution, i.e. solution A.

[0050] Step 2. Etching Ti by hydrofluoric acid 3 AlC 2 To prepare MXene dispersion, and control its concentration to 2 mg mL with deionized water -1 . Mix the MXene dispersion with solution A at a mass ratio of 1:3 to obtain solution B.

[0051] Step 3. The solution B was magnetically stirred at a rotation speed of 500 r / min for 10 minutes, and then ultrasonically treated for 30 minutes to obtain a solution C. The ultrasonic power was 150 W.

[0052] Step 4: Add 3 wt% of cellulose nanofibers to solution C, then magnetically stir it at 200 r / min for 150 min, and then perform ultrasonic treatment at 150 W ultrasonic power for 200 min to obtain composite...

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Abstract

The invention discloses a preparation method of telescopic MXene/graphene composite aerogel with a high electromagnetic shielding effect. According to the method, the three-dimensional netlike composite aerogel with a rich pore structure is formed through compounding MXene and reduced graphene oxide, inducing the reduced graphene oxide and the MXene by utilizing a modifying agent and performing cold and dry treatment. The preparation method disclosed by the invention has the following advantages that the telescopic MXene/graphene composite aerogel with the high electromagnetic shielding effectcan be obtained through uniformly mixing the reduced graphene oxide and MXene dispersing liquid, introducing the modifying agent and finally performing the cold and dry treatment, which reduces the stacking density of the MXene, constructs a new macroscopic appearance, has extremely excellent mechanical property and scalability and promotes the application feasibility of the MXene in aerospace field.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite material preparation, and relates to a preparation method of MXene / graphene composite airgel. Background technique [0002] MXene is a two-dimensional transition metal carbide or carbonitride with a graphene-like structure, which is generally prepared by etching or stripping off the A-layer elements in the MXA phase. For the MAX phase, M refers to transition metal elements, A usually refers to group IIIA and IVA elements, and X refers to carbon or nitrogen. [0003] MXene has the same excellent electrical conductivity as graphene. It is a new type of two-dimensional material with metal conductive properties and has extremely excellent electromagnetic shielding properties. However, the general MXene material exists macroscopically in the form of powder or film, and its structure is extremely dense, resulting in high density, and the structure is easily damaged and has no scalability, which s...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘宇艳原因樊志敏王友善谢志民
Owner HARBIN INST OF TECH
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