Electrostatic spinning method for controlling assembly of nanofibers with two-dimensional and three-dimensional structures

Abstract

The invention belongs to the field of micro / nanofibers prepared by an electrostatic spinning technology, and relates to a process for freely controlling self-assembled fibers with a three-dimensional stacking structure by the electrostatic spinning technology, in particular to an electrostatic spinning method for controlling the assembly of nanofibers with two-dimensional and three-dimensional structures. The method comprises the following three steps of: self-assembling the nanofibers with the three-dimensional structure, wherein a positive electrode of a high-voltage direct-current power supply is connected to a spinning needle by the conventional electrostatic spinning device, a filter collection device is a grounded aluminum foil, and a spinning solution with positive charges is sprayed from the spinning needle under the action of an electrostatic field and is stretched, split and refined to form the micro / nanofibers which fall on the grounded aluminum foil; converting the three-dimensional stacking structure into a two-dimensional film; and converting a two-dimensional stacking structure into a three-dimensional film, so that free control is realized. The whole process is simple and easy to operate and control, used equipment is technically mature, an electrostatic spinning effect is good, efficiency is high, and environment friendliness is achieved.

Description

Technical field: [0001] The invention belongs to the field of micro-nano fibers prepared by electrospinning technology, and relates to an electrospinning self-assembled three-dimensional stacking structure fiber and a method for freely controlling the macrostructure (such as two-dimensional film and three-dimensional stacking) of the electrospinning fiber Technological process, especially an electrospinning method for controlled assembly of nanofibers with two-dimensional and three-dimensional structures. Background technique: [0002] Electrospinning technology is a method for preparing micro-nano fibers with high efficiency and low consumption. Compared with other methods, the electrospinning method has simple equipment and flexible operation, and is suitable for continuous electrospinning of most polymers. A traditional electrospinning device consists of three parts: a high-voltage power supply, a fiber launching device filled with spinning solution, and a fiber collecti...

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Problems solved by technology

According to literature research, the current method of preparing three-dimensional structure nanofibers by electrospinning mainly exists in the following categories: one is to increase the electrospinning time, thereby increasing the thickness of the spinning film, and obtaining a three-dimensional structure fiber film, but the operation time of this method is It is often very long (such as tens of hours), and the thickness of the fiber membrane can only reach a few millimeters; the second is to remove the prepared two-dimensional fiber membrane from the collector, and obtain the three-dimensional structural fiber ( Energy Environmental Science 2011, 4: 2807); the third is to replace the two-dimensional collection device with a three-dimensional collection device (Journal of Power Sources 2007, 164: 874; Nano Letters 2008, 8: 3283; International Journal of Biological Macromolecules 2009, 45: 504 ); In addition, by adding foaming agent (Biomaterials 2006,27: 3782; Journal of Biomedical Materials Research Part B: Applied Biomaterials 2007, 81B (1): 104) etc. mode also has report in the solution, but above-mentioned method generally exists Due to the disadvantages of complex operation and high cost, there are few reports at home and abroad on issues such as electrospinning self-assembled three-dimensional nanofibers and their formation mechanism, and whether they can be freely controlled to generate two-dimensional or three-dimensional electrospun fibers.

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