High depth-to-width ratio nanofiber structure based on mechanical stretching and preparation method of high depth-to-width ratio nanofiber structure

Abstract

The invention discloses a high depth-to-width ratio nanofiber structure based on mechanical stretching and a preparation method of the high depth-to-width ratio nanofiber structure. The preparation method comprises the following steps: 1, preparing a flexible pore array die by adopting a replication method; 2, coating the solution of a polymer on a base material to form a polymer film; 3, enabling the flexible pore array die to be in excellent contact with the polymer film and enabling the polymer to be filled into pores on the die; 4, finally, carrying out mechanical stretching on the polymer film through the flexible pore array die, and curing and demoulding after completing stretching so as to prepare the high depth-to-width ratio nanofiber structure of which the end part is provided with a mass block. According to the invention, high depth-to-width ratio nanofibers can be formed through the mechanical stretching of the die on the polymer; the difficult problems generated in the process of preparing the high depth-to-width ratio nano-structure in the replication method are solved; the high depth-to-width ratio nanofiber structure has a simple process structure and is prepared only by mechanical stretching through controlling the direction of mechanical stretching; compared with methods such as an electrospining method, a chemical method and a micro nano processing method, the preparation method of the high depth-to-width ratio nanofiber structure is more effective and economic.

Description

technical field [0001] The invention belongs to the field of micro-nano manufacturing, and relates to a mechanical stretch-based nanofiber structure with a large aspect ratio and a preparation method thereof. Background technique [0002] Polymer nanofibers with large aspect ratios have great application prospects in the fields of sensors, biology, and bionics, and their preparation methods have always been a hot topic in the field of micro-nano manufacturing. Various techniques are currently used to prepare nanofibers with different structures to meet different needs. [0003] In the prior art, there are mainly electrospinning method, micro-nano processing method, self-assembly method and so on. The principle of electrospinning is that when the electric field force applied to the charged liquid (polymer, metal oxide slurry, etc.) exceeds the surface tension of the liquid, the charged liquid is jetted out from the spinneret in the form of fiber bundles, and on the collectin...

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Problems solved by technology

For example, this method is severely limited by the materials and processes used, and the prepared nanofiber structure is periodic, making it difficult to achieve directional and localized manufacturing.

[0006] The above methods are difficult to realize the preparation of nanofiber arrays with controllable tilt angle, especially the preparation of nanofiber arrays with mass blocks at the ends.

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