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Flexible high-entropy ceramic nanofiber and polymer-free template preparation method thereof

A technology of nanofibers and polymers, applied in the direction of inorganic raw materials such as artificial filaments, can solve the problems of low production efficiency, large production pollution, poor flexibility of fiber materials, etc., and achieve a good universal effect

Active Publication Date: 2022-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the subsequent processing process, these polymer templates must be removed by high-temperature calcination to obtain pure high-entropy ceramic nanofibers, which have defects such as poor flexibility of fiber materials, low production efficiency, and large production pollution.

Method used

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  • Flexible high-entropy ceramic nanofiber and polymer-free template preparation method thereof
  • Flexible high-entropy ceramic nanofiber and polymer-free template preparation method thereof
  • Flexible high-entropy ceramic nanofiber and polymer-free template preparation method thereof

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preparation example Construction

[0043] The invention provides a polymer-free template preparation method for flexible high-entropy ceramic nanofibers, comprising the following steps:

[0044] 1) Add monodentate ligands, bridging ligands and more than 5 kinds of inorganic precursors into the complex solvent, and perform multiple coordination reactions under constant temperature and stirring conditions to obtain a homogeneous solution;

[0045] 2) layered reverse stirring is carried out to the homogeneous solution in step 1);

[0046] 3) Introduce cold and humid air, and promote the hydrolysis-polycondensation reaction of the precursor under constant temperature conditions to obtain a linearly grown prepolymer;

[0047] 4) carry out vacuum distillation to obtain a linear inorganic polymer sol with non-Newtonian fluid characteristics;

[0048] 5) Using a temperature / alkali steam-assisted electrospinning process, the linear inorganic polymer sol with non-Newtonian fluid properties is prepared into inorganic gel...

Embodiment

[0062] A polymer-free template preparation method for flexible high-entropy ceramic nanofibers, the specific steps are as follows:

[0063] The first step: add hydrochloric acid, acetylacetone, cerium isopropoxide, lanthanum isopropoxide, samarium isopropoxide, yttrium isopropoxide, and neodymium isopropoxide in the composite solvent of isopropanol and dichloroethane successively, at 30 Under the temperature of 500r / min, the multi-coordination reaction was carried out for 12h to obtain a homogeneous transparent solution of the bifunctional titanium precursor; wherein, the content of the inorganic precursor was 30wt%, and the content of the monodentate ligand was 0.5wt%. The ligand content is 2wt%, isopropanol accounts for 90wt% in the composite solvent, and the average number of functional groups of the bifunctional precursor is 2.2.

[0064] Step 2: carry out layered reverse stirring on the homogeneous transparent solution of the titanium precursor, the rotating speed of the ...

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Abstract

The preparation method comprises the following steps: firstly, sequentially adding a monodentate ligand, a bridging ligand and a plurality of inorganic precursors into a composite solvent to carry out multiple coordination reaction, then carrying out layered reverse stirring, and introducing cold moisture, so as to obtain the flexible high-entropy ceramic nanofiber. Carrying out reduced pressure distillation under a constant temperature condition to obtain linear inorganic polymer sol with non-Newtonian fluid characteristics; then carrying out temperature / alkali steam assisted electrostatic spinning on the linear inorganic polymer sol to obtain inorganic gel nanofibers; then introducing the inorganic gel nanofiber into a desorption bath for pressurized desorption, and finally ceramizing the fiber in a pre-burning area and an alternating atmosphere calcining area to obtain the flexible high-entropy ceramic nanofiber. Compared with the prior art, no polymer template exists in the preparation process, the average diameter of the prepared nanofiber is 50-500 nm, the softness is smaller than 300 mN, the fiber comprises five or more elements, the fiber material is in a single crystal phase, and all the elements are evenly distributed.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a preparation method of a flexible high-entropy ceramic nanofiber and a polymer-free template. Background technique [0002] High-entropy ceramic nanofibers are a new class of ceramic materials. This type of material is composed of more than 5 elements, the molar content of each element is between 5-35%, and the material as a whole is in a single crystal phase. The high-entropy effect brought about by mixing endows high-entropy ceramic nanofibers with excellent thermal, electrical, and magnetic properties. At the same time, the characteristics of high porosity, large specific surface area, light weight, and strong small size effect make it play a key role in aerospace, electronic information, clean energy, environmental governance and other fields, and has extremely high application value. [0003] At present, high-entropy ceramic nanofibers are mainly obtained by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/624D01F9/08
CPCC04B35/50C04B35/62231C04B35/624D01F9/08C04B2235/3229C04B2235/3227C04B2235/3225C04B2235/3224C04B2235/781C04B2235/96C04B2235/6583C04B2235/656C04B2235/6567
Inventor 丁彬郭竑宇斯阳刘华磊印霞俞建勇
Owner DONGHUA UNIV