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CN-122013508-A - Magnetic response multidimensional deformation carbon nano tube composite fiber, preparation method and application thereof

CN122013508ACN 122013508 ACN122013508 ACN 122013508ACN-122013508-A

Abstract

The invention provides a magnetic response multidimensional deformation carbon nano tube composite fiber, a preparation method and application thereof. The preparation method comprises the steps of applying ultrasonic treatment to a fiber precursor, immersing the fiber precursor in a solution of the magnetic material precursor to enable the magnetic material precursor to diffuse into the fiber precursor, annealing to obtain a preassembled body, twisting to form a twisted fiber body, coiling the twisted fiber body on a columnar body, and shaping by utilizing instantaneous Joule heat treatment to obtain the magnetic response multidimensional deformation carbon nano tube composite fiber. According to the invention, the magnetic material precursor fully permeates into the carbon nano tube fiber in a solution impregnation mode, soft magnetic particles which are uniformly dispersed and combined are formed after annealing treatment, spiral shaping is realized through an instantaneous Joule heating effect, so that the carbon nano tube fiber body is tightly wrapped to form firm combination, and the magnetic composite fiber with extremely strong flexibility, high strength, high conductivity and no failure characteristics such as interlayer stripping is provided, and has a wide application prospect.

Inventors

  • LI QINGWEN
  • SONG WENWEN
  • DI JIANGTAO

Assignees

  • 中国科学院苏州纳米技术与纳米仿生研究所

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The preparation method of the magnetic response multidimensional deformation carbon nano tube composite fiber is characterized by comprising the following steps: Applying ultrasonic treatment to the carbon nanotube fiber precursor so as to loosen fiber bundles in the carbon nanotube fiber precursor; immersing the carbon nanotube fiber precursor subjected to ultrasonic treatment in a solution of a magnetic material precursor, so that the magnetic material precursor is diffused into the carbon nanotube fiber precursor to obtain a magnetic carbon nanotube precursor; Annealing the magnetic carbon nanotube precursor to convert the magnetic material precursor into soft magnetic particles to obtain a preassembly; twisting the pre-assembly to form a twisted fibrous body; And coiling the twisted fiber body on a columnar body to form a spiral shape, applying current to the twisted fiber body, and shaping the twisted fiber body by utilizing instantaneous Joule heat treatment to obtain the magnetic response multidimensional deformation carbon nano tube composite fiber, wherein the temperature of the instantaneous Joule heat treatment is above 1000 ℃, and the electrifying duration is within 3 min.
  2. 2. The method of claim 1, wherein the power of the ultrasonic treatment is 50-200W for 3-10min.
  3. 3. The method of claim 1, wherein the magnetic material precursor comprises a halide of an iron-based element; and/or the solvent in the solution of the magnetic material precursor comprises water and/or an alcohol solvent.
  4. 4. A method of preparing a magnetic material according to claim 3, wherein the solution of the magnetic material precursor is an ethanol solution of cobalt chloride.
  5. 5. The method according to claim 4, wherein the concentration of the solution of the magnetic material precursor is 0.5 to 2 mol/L.
  6. 6. The method of claim 1, wherein the carbon nanotube fiber precursor is impregnated for a time of not less than 10 minutes.
  7. 7. The method according to claim 1, wherein the annealing atmosphere is a mixture of an inert gas and hydrogen gas in a volume ratio of (1-4): 1; The annealing treatment is carried out at 300-500 ℃ for 20-60min.
  8. 8. The preparation method according to claim 1, characterized in that it comprises in particular: Applying a first load, twisting the pre-assembly to form the twisted fiber body; Applying a second load, coiling the twisted fiber body on the columnar heating body, and maintaining the second load to perform the instantaneous joule heating process; Wherein the second load is 3-8 times the first load.
  9. 9. The magnetically responsive multi-dimensional deformable carbon nanotube composite fiber of any one of claims 1-8, comprising a carbon nanotube fiber body, soft magnetic particles; The carbon nanotube fiber body has a twist with a length direction as an axis and a macroscopic spiral shape, and the soft magnetic particles are embedded in gaps between fiber bundles in the carbon nanotube fiber body.
  10. 10. The use of the magnetically-responsive multidimensional deformation carbon nanotube composite fiber of claim 9 in the field of magnetic actuation.

Description

Magnetic response multidimensional deformation carbon nano tube composite fiber, preparation method and application thereof Technical Field The invention belongs to the technical field of material science, and particularly relates to a magnetic response multidimensional deformation carbon nano tube composite fiber, a preparation method and application thereof. Background With the development of flexible electronics, micro robots and biomedical technology, the smart driving materials are subjected to severe requirements such as light weight, high strength, large deformation, quick response and biocompatibility. The magnetic fiber is used as a one-dimensional linear driver, is attractive because of simple structure, easy integration and capability of realizing complex three-dimensional movement, and has great application potential in intravascular micro robots, variable-rigidity holders and wearable sensing and driving integrated equipment. However, the traditional magnetic fiber material system has obvious limitations, and is difficult to meet the comprehensive requirements of the application, namely, although the metal alloy magnetic fiber (such as iron-cobalt-nickel-based alloy) has excellent mechanical strength and magnetic saturation strength, the metal alloy magnetic fiber has overlarge density and insufficient flexibility (bending/torsion performance), plastic deformation or fatigue fracture is easy to occur in occasions needing large bending deformation or rapid reciprocating motion, the polymer-based magnetic composite fiber has low density and good flexibility, but the mechanical strength of a matrix is low, the conductivity is poor, the magnetic fiber with a multilayer composite structure (such as a core shell or a layered structure of a magnetic layer/an elastic layer/a supporting layer) can partially balance the performance through structural design, but an interlayer interface is easy to peel under repeated deformation, so that performance is attenuated, and the preparation process is generally complex and difficult to realize continuous and large-scale production. Disclosure of Invention The invention mainly aims to provide a magnetic response multidimensional deformation carbon nano tube composite fiber, a preparation method and application thereof, so as to overcome the defects of the prior art. In order to achieve the above object, the present invention adopts the following technical scheme: in a first aspect, the present invention provides a method for preparing a magnetically-responsive multidimensional deformation carbon nanotube composite fiber, comprising: Applying ultrasonic treatment to the carbon nanotube fiber precursor so as to loosen fiber bundles in the carbon nanotube fiber precursor; immersing the carbon nanotube fiber precursor subjected to ultrasonic treatment in a solution of a magnetic material precursor, so that the magnetic material precursor is diffused into the carbon nanotube fiber precursor to obtain a magnetic carbon nanotube precursor; Annealing the magnetic carbon nanotube precursor to convert the magnetic material precursor into soft magnetic particles to obtain a preassembly; twisting the pre-assembly to form a twisted fibrous body; And coiling the twisted fiber body on a columnar body to form a spiral shape, applying current to the twisted fiber body, and shaping the twisted fiber body by utilizing instantaneous Joule heat treatment to obtain the magnetic response multidimensional deformation carbon nano tube composite fiber, wherein the temperature of the instantaneous Joule heat treatment is above 1000 ℃, and the electrifying duration is within 3 min. In a second aspect, the invention also provides the magnetically responsive multidimensional deformation carbon nanotube composite fiber prepared by the preparation method, which comprises a carbon nanotube fiber body and soft magnetic particles; The carbon nanotube fiber body has a twist with a length direction as an axis and a macroscopic spiral shape, and the soft magnetic particles are embedded in gaps between fiber bundles in the carbon nanotube fiber body. In a third aspect, the invention also provides an application of the magnetic response multidimensional deformation carbon nano tube composite fiber in the field of magnetic driving. Compared with the prior art, the invention has the beneficial effects that at least: According to the preparation method provided by the invention, the magnetic material precursor fully permeates into the carbon nano tube fiber in a solution impregnation mode, soft magnetic particles which are uniformly dispersed and combined are formed after annealing treatment, and meanwhile, spiral shaping is realized through an instantaneous Joule heating effect, so that the carbon nano tube fiber body tightly wraps the soft magnetic particles to form firm combination, and the magnetic composite fiber with extremely strong flexibility, high strength, high conductivity and no failure chara