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A kind of nanofiber and preparation method thereof

A nanofiber, composite nanofiber technology, applied in fiber processing, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of high surface tension, low content and low stretchability of graphene oxide solution

Active Publication Date: 2021-09-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of graphene nanofibers using electrospinning has always been a challenge: on the one hand, the surface tension of graphene oxide solutions is too high and the stretchability is too low to be stretched into fibers; Adding graphene oxide in the polymer will seriously damage the stacking of graphene sheets, so that its content is often very low (solid content <5wt%), and the less graphene oxide content cannot be effectively assembled into graphene fibers during the stretching process. , even after the polymer is carbonized, it is dominated by amorphous carbon fiber components

Method used

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  • A kind of nanofiber and preparation method thereof
  • A kind of nanofiber and preparation method thereof
  • A kind of nanofiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Prepare a graphene oxide aqueous solution with a concentration of 1 wt% and a sodium polyacrylate aqueous solution with a concentration of 2.33 wt%. Among them, the graphene oxide (GO) sheet size distribution is 20-30 μm, and the average size is about 25 μm according to statistics.

[0063] (2) After the two are mixed at a mass ratio of 1:1 (that is, the proportion of graphene is 30wt%), use a homogenizer to obtain a sodium polyacrylate / graphene oxide mixed spinning solution, and the spinning solution is measured at 25 The draw ratio is 3900% at °C.

[0064] (3) Inhale the spinning solution into a 10ml syringe, connect the syringe needle (21#) to 15kV positive high voltage, extrude the needle at a constant speed of 0.08mm / min, use 2 iron wires placed horizontally as a collection device at a place 20cm below the needle and ground it (Such as figure 1 ).

[0065] (4) Remove the fibers between the two iron wires, and use hydroiodic acid to fumigate at 95°C for 12 ho...

Embodiment 2

[0070](1) A graphene oxide aqueous solution with a concentration of 2wt% and a sodium polyacrylate aqueous solution with a concentration of 2wt% are respectively configured. Among them, the graphene oxide (GO) sheet size distribution is 20-30 μm, and the average size is about 25 μm according to statistics.

[0071] (2) After the two are mixed at a mass ratio of 1:1 (that is, the proportion of sodium polyacrylate is 50wt%), use a homogenizer to obtain a sodium polyacrylate / graphene oxide mixed spinning solution, and the spinning solution is measured at The draw ratio was 2500% at 25°C.

[0072] (3) Inhale the spinning solution into a 10ml syringe, connect the syringe needle (21#) to a positive high voltage of 15kV, extrude the needle at a constant speed of 0.08mm / min, and use a horizontally placed copper mesh as a collection device at a place 20cm below the needle. Grounded, after several hours, the graphene oxide nanofiber non-woven fabric can be collected on the surface of t...

Embodiment 3

[0076] (1) A graphene oxide aqueous solution with a concentration of 2.4wt% and a sodium polyacrylate aqueous solution with a concentration of 1.6wt% were prepared respectively. Among them, the graphene oxide (GO) sheet size distribution is 20-30 μm, and the average size is about 25 μm according to statistics.

[0077] (2) Graphene oxide and sodium polyacrylate were weighed according to the mass ratio of 1:1, dispersed in water to form a mixed solution, and the stretching ratio of the spinning solution at 25°C was measured to be 3150%.

[0078] (2) Inhale the spinning solution into a 10ml syringe, connect the syringe needle (21#) to 18kV positive high voltage, extrude the needle at a constant speed of 0.1mm / min, use a horizontally placed copper mesh as a collection device at 20cm vertically below the needle, the copper mesh Grounded, after several hours, the graphene oxide nanofiber non-woven fabric can be collected on the surface of the copper mesh;

[0079] (3) The above-me...

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Abstract

The invention discloses a method for preparing graphene nanofibers and non-woven fabrics using a fluid with an ultrahigh draw ratio by using a high-voltage electrospinning method. Compared with other methods of preparing graphene fibers (wet spinning, air-assisted spinning, etc.), the diameter of graphene fibers obtained by this method is smaller (about 100-500nm), and the yield is higher. The mechanical properties of the fiber itself and better electrical performance. The invention discloses a method for preparing ultrafine graphene nanofibers and non-woven fabrics by electrospinning a polymer / graphene oxide mixed spinning liquid system (the polymer is sodium polyacrylate), and the process is highly efficient and environmentally friendly , the resulting graphene nanofibers are currently the thinnest graphene fibers.

Description

technical field [0001] The invention relates to the field of graphene materials, in particular to nanofibers and a preparation method thereof. [0002] technical background [0003] Graphene (Graphene) is made of sp 2 The two-dimensional honeycomb lattice structure monoatomic layer crystal formed by the accumulation of hybrid monolayer carbon atoms, the covalent bond energy between carbon atoms in the coplanar plane can reach 607KJ / mol. The super-strong bond energy endows graphene with intentional mechanical properties and structural rigidity, the tensile strength can reach 130GPa, and the elastic modulus can reach more than 1TPa. At the same time, the p orbitals of carbon atoms in the plane overlap each other to form large π bonds, and the weakly localized electrons can jump freely between adjacent carbon atoms in the plane, so graphene also has good electrical properties, with a resistivity as low as 10 -6 Ω·cm, which is the material with the lowest room temperature resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/00D01D5/22D01D10/02D01F6/16D01F1/10
CPCD01D5/003D01D5/22D01D10/02D01F1/10D01F6/16
Inventor 高超王佳庆
Owner ZHEJIANG UNIV