Aerogel fiber having specific cross-sectional morphological feature, graphene fiber and preparation method and device therefor

Patent metadata

Field	Value
Publication number	US-12435447-B2
Application number	US-202418434741-A
Country	US
Kind code	B2
Filing date	Feb 6, 2024
Priority date	Dec 14, 2021
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

An aerogel fiber having specific cross-sectional morphological feature, graphene fiber and a preparation method and device therefor are provided. The arrangement of the cross-sectional two-dimensional nanosheets of the aerogel fiber can be regulated. The regulation method includes: adding a rotating flow field device during wet spinning before the spinning fluid is sprayed out, the rotating flow field causes the two-dimensional nanosheets to form a specific sheet-like arrangement in the cross-sectional direction of the gel fiber under the action of rotating shear, and preparing a graphene oxide aerogel fiber with specific morphological structure (concentric or spiral) from the gel fiber having specific cross-sectional morphological structure under freeze-drying conditions. Further, drying and densifying, stretching and reducing the hydrogel fiber with the concentric circle structure are performed to obtain a graphene fiber with high modulus and high thermal conductivity.

First claim

The invention claimed is:

1. A method for preparing the aerogel fiber having specific cross-sectional morphological feature, which is consisted of two-dimensional nanosheets, and has a cross section in a concentric sheet arrangement or a radially spiral sheet arrangement, the method comprising:
extruding a dispersion of two-dimensional nanosheets into a circular spinning tube with an axial speed along an extrusion direction and passing the dispersion through a rotating rotor with a rotation speed perpendicular to the axial speed to cause the dispersion to form a concentric circle arrangement or a spiral arrangement;
extruding the dispersion with a concentric circle arrangement or a spiral arrangement into a coagulation bath to obtain a gel fiber; and
performing structural fixation after coagulation to obtain the aerogel fiber having specific cross-sectional morphological feature.

2. An aerogel fiber prepared by a method according to claim 1 .

3. The method according to claim 1 , wherein the rotor introduces a circumferential rotational shear force into the dispersion of two-dimensional nanosheets.

4. The method according to claim 1 , wherein the two-dimensional nanosheets are one or more nanosheets with two-dimensional anisotropy selected from a group consisting of graphene oxide, graphene, Mxene, molybdenum disulfide and montmorillonite.

5. The method according to claim 1 , wherein the dispersion of two-dimensional nanosheets has a concentration greater than 1 mg/g.

6. A device for preparing an aerogel fiber according to claim 2 , the device at least comprising an extrusion device, a coagulation bath and a freeze-drying system; wherein the extrusion device comprises a spinning tube which has a circumferential rotational shear force therein.

7. The device according to claim 6 , wherein the spinning tube has a rotor therein, and the rotor is located at an axis of the spinning tube.

8. The device according to claim 6 , wherein the rotor in the spinning tube rotates about its axis.

9. The method according to claim 1 , wherein the rotor is located at an axis of the spinning tube.

10. The method according to claim 1 , wherein the rotor in the spinning tube rotates about its axis.

11. The method according to claim 1 , wherein the coagulation bath is one or more coagulation baths selected from a group consisting of ethyl acetate, methylene chloride, acetic acid, ethanol, isopropyl alcohol, chloroform and acetone, or a coagulation bath of an aqueous solution of high-valent salt which is calcium chloride, ferrous chloride or ferric sulfate.

12. The method according to claim 1 , wherein the axial speed is 0.2 mL/min.

13. The method according to claim 1 , wherein the step of performing structural fixation comprising freeze-drying the gel fiber to obtain the aerogel fiber having specific cross-sectional morphological feature.

14. The method according to claim 13 , wherein the freeze-drying temperature is −80° C. or −120° C., and the freeze-drying time is 1 hour.

Assignees

• Univ Zhejiang

Inventors

• Gao Chao
• Li Peng
• Liu Yingjun
• Xu Zhen
• Wang Ziqiu

Classifications

• D10B2401/16

  antistatic; conductive · CPC title

• D10B2401/08

  foamed · CPC title

• D10B2101/12

  Carbon; Pitch · CPC title

• D01F9/12 Primary

  Carbon filaments; Apparatus specially adapted for the manufacture thereof · CPC title

• D01D10/06

  Washing or drying · CPC title