A method for preparing graphene/polymer ordered micro-nano composite fibers by magnetic spinning

Abstract

The invention discloses a method for preparing graphene / polymer micro-nano fibers by magnetic spinning, which comprises the following steps: (1) building a magnetic spinning device: the magnetic spinning device includes a rotating collection disc with a permanent magnet; (2) ) Preparation of precursor spinning solution: magnetic nanoparticles, high molecular polymer and graphene dispersion are mixed and dissolved in an organic solvent to prepare a solution; (3) graphene / polymer micro-nano composite fiber is prepared by using a magnetic spinning device: the precursor The spinning solution is injected into the feeding device, and the feeding device is turned on. The liquid droplets at the nozzle of the spinning nozzle form a jet flow and bridge the permanent magnet under the action of the magnetic field force, and the DC brushless motor is turned on to drive the collecting disc to rotate. Under the action of the magnetic field force, the ferrofluid jet is continuously pulled out and entangled between the vertical pillars of the collecting disc to form micro-nano fibers. The method does not require high-voltage action, reduces production costs and safety hazards, has orderly fiber arrangement, is suitable for large-scale production, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of graphene composite micro-nano composite materials, in particular to a method for preparing graphene / polymer ordered micro-nano composite fibers by magnetic spinning. Background technique [0002] Micro-nanofibers prepared from polymers such as polyethylene oxide, polyvinylidene fluoride, polycaprolactone, polystyrene, polymethyl methacrylate, etc. have high specific surface area, high aspect ratio and porosity It is obviously different from the properties of light, heat, force, electricity, and magnetism of bulk materials, so it has a wide range of applications in many fields such as micro-nano optoelectronic devices, filtration and separation, biosensing, and tissue engineering. In order to improve the performance of micro-nano fibers to meet different application requirements, while developing new polymer materials, it is also a common technical means to prepare polymer-based micro-nano composite fibers by using ...

AI Technical Summary

Problems solved by technology

However, traditional electrospinning devices usually require a high-voltage DC power supply of up to tens of kilovolts or even tens of kilovolts to provide the electrostatic field required for spinning, which will not only cause certain safety hazards to operators, but also increase production costs. ; In addition, the graphene composite micro-nano fibers prepared by the current electrospinning equipment mostly exist in the form of non-woven fabrics, and the fiber arrangement is very messy and disorderly, which restricts its application in the fields of biomedicine, conductive materials, and sensors.

In order to improve the above-mentioned limitations of traditional electrospinning technology, the Chinese patents "A Portable Handheld Electrospinning Device (ZL201210229010.3)" and "A Portable Melt Electrospinning Teaching Demonstration Device (ZL201310025425.3)" were published respectively. A portable electrospinning device that uses dry batteries and induction motors to replace traditional high-voltage DC power supplies, but the above-mentioned devices cannot prepare ordered micro-nano fibers

In addition, researchers have successively proposed methods such as drum / flywheel method, auxiliary electric field method, frame method, and parallel plate electrode method to prepare ordered micro-nano fibers by improving the receiving device in the traditional electrospinning device, but without exception, they still need to rely on High-voltage electrostatic spinning, high working voltage, potential safety hazards and high production costs

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