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MXene aerogel fiber as well as preparation method and application thereof

An airgel fiber and airgel technology, applied in the direction of wet spinning, inorganic raw material artificial filament, artificial filament heat treatment, etc., can solve the problem of limiting the feasibility of MXene airgel, affecting the conductivity of MXene airgel, There are no problems reported in the literature, achieving good light-to-heat conversion performance, suitable for large-scale production, and low cost

Active Publication Date: 2021-11-30
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN113101877A, patent CN109679146A and patent CN112011094A all disclose a kind of MXene airgel, but the MXene airgel material disclosed in the above-mentioned patents is mainly in block shape, its flexibility is poor, and its ability to be compiled is poor, which limits the MXene airgel Feasibility in emerging diversified application fields, such as flexible wearables, microelectronic circuits, microfluidic transportation, smart drives, smart fabrics, portable functional devices / equipment, etc.; in addition, the MXene airgel materials disclosed in the above patents are all It is a composite MXene airgel, and the addition of non-conductive nanocellulose as a second component will seriously affect the conductivity of the obtained MXene airgel
In addition, in the research literature of MXene aerogels, almost no MXene aerogel materials at the mesoscopic scale can be seen, especially MXene aerogels with fiber morphology have not been reported in the literature so far.

Method used

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  • MXene aerogel fiber as well as preparation method and application thereof
  • MXene aerogel fiber as well as preparation method and application thereof
  • MXene aerogel fiber as well as preparation method and application thereof

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preparation example Construction

[0039]A kind of preparation method of MXene airgel fiber provided by another aspect of the embodiment of the present invention comprises:

[0040] Perform chemical etching on MAX phase materials to obtain MXene materials and form MXene dispersions;

[0041] Using the MXene dispersion as a spinning solution, using spinning technology to prepare MXene hydrogel fibers;

[0042] The MXene hydrogel fiber is dried to obtain the MXene airgel fiber.

[0043] In some embodiments, the preparation method includes: chemically etching the MAX phase material with a mixture of lithium fluoride and hydrochloric acid or hydrogen fluoride.

[0044] In some embodiments, the MAX phase material includes Ti 3 AlC 2 、Ti 2 AlC and Ti 3 Any one or a combination of two or more of AlCN, etc., but not limited thereto.

[0045] see figure 1 As shown, in some typical implementation cases, the preparation method specifically includes:

[0046] (1) Use LiF and HCl or HF to etch the MAX phase material...

Embodiment 1

[0064] (1) Etching Ti with LiF and HCl 3 AlC 2 , add water to prepare MXene dispersion liquid, wherein the concentration of MXene dispersion liquid is 70mg / mL;

[0065] (2) The MXene dispersion obtained in step (1) is wet-spun to obtain MXene hydrogel fibers. Specifically, the MXene dispersion is squeezed through a spinning needle with a diameter of 500 μm at an extrusion speed of 100 μL / min. out into 5wt% CaCl 2 In the aqueous coagulation bath, MXene hydrogel fibers are obtained;

[0066] (3) The MXene hydrogel fiber obtained in step (2) is obtained by supercritical drying to obtain the MXene airgel fiber.

[0067] Through the above steps, the digital photos of the MXene airgel fibers prepared in this embodiment are as follows: figure 2 As shown, the cross-section and surface SEM of the obtained MXene airgel fibers are shown in image 3 The specific properties of MXene airgel fibers are shown in Table 1.

Embodiment 2

[0069] (1) Etching Ti with LiF and HCl 2 AlC, add water to prepare MXene dispersion, wherein the concentration of MXene dispersion is 17.5mg / mL;

[0070] (2) The MXene dispersion obtained in step (1) is wet-spun to obtain MXene hydrogel fibers. Specifically, the MXene dispersion is squeezed through a spinning needle with a diameter of 500 μm at an extrusion speed of 10 μL / min. Enter the coagulation bath of 0.2wt% calcium chloride aqueous solution after going out, obtain MXene hydrogel fiber;

[0071] (3) The MXene hydrogel fiber obtained in step (2) is obtained by supercritical drying to obtain the MXene airgel fiber.

[0072] After the above steps, the nitrogen adsorption and desorption curve and pore size distribution diagram of the MXene airgel fiber obtained in this embodiment are as follows: Figure 4a and Figure 4b The specific properties of MXene airgel fibers are shown in Table 1.

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Abstract

The invention discloses an MXene aerogel fiber as well as a preparation method and application thereof. The preparation method comprises the following steps of carrying out chemical etching treatment on an MAX phase material to obtain an MXene material, and forming an MXene dispersion liquid; and taking the MXene dispersion liquid as a spinning solution, preparing a MXene hydrogel fiber by adopting a spinning technology, and then drying the MXene hydrogel fibers to obtain the MXene aerogel fiber. The preparation method is simple and rapid, continuous large-scale preparation of the MXene aerogel fiber is facilitated, the prepared MXene aerogel fiber has a continuous MXene three-dimensional hierarchical pore network structure formed by lapping two-dimensional MXene sheet layers, the porosity is high, the specific surface area is large, the diameter is adjustable, the length-diameter ratio is large, the conductivity is high, the conductivity is excellent, the strength and the toughness are good, and the MXene aerogel fiber can be used in the fields of conductive yarns, electric heating, energy devices, composite materials, catalysis, antennas, electromagnetic shielding, wave absorption and the like.

Description

technical field [0001] The invention relates to a novel airgel fiber material, in particular to an MXene airgel fiber and its preparation method and application, and belongs to the technical field of nanoporous materials and functional fibers. Background technique [0002] Airgel is a highly dispersed solid material in which colloidal particles or polymer molecules aggregate to form a nanoporous network structure and the pores are filled with a gaseous dispersion medium. During the drying process of the wet gel, the liquid component in it is replaced by gas. 3D porous nanomaterials that still maintain their gel network. Airgel was first prepared by Sterven.S.Kistler of Stanford University in 1931 by hydrolyzing water glass with hydrochloric acid and supercritical drying technology. The three-dimensional continuous network structure of airgel and its high porosity (80% to 99.8%), high specific surface area, low density and low thermal conductivity make it widely used in ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01D10/02D01D5/06
CPCD01F9/08D01D10/02D01D5/06
Inventor 张学同李玉珍
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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