CN103741229A - Preparation method for directionally-arranged electrospinning nanofibres and electrospinning device - Google Patents

Abstract

The invention discloses a method for preparing electrospun nanofibers in an oriented arrangement, which comprises the following steps: folding metal collection sheets, cleaning them, and putting them in a drying box for standby; preparing a high polymer solution as an electrospinning solution; The electrospinning solution is injected into the electrospinning device; the prepared folded metal collection sheet is used as a collecting plate, and the electrospinning device is turned on, under the action of an applied electric field at a voltage of 10-20KV, and at a collection distance of 10-30 cm Under the condition, the aligned electrospun nanofibers are collected on the metal collection sheet, and the desired shape nanofibers are obtained by adjusting the direction of the metal collection sheet. The invention also provides an electrostatic spinning device. The present invention adopts the method of folding metal collection flakes for material preparation, that is, the collection device—the metal flakes are folded like a fan, and then used as a collection plate to collect nanofibers to obtain oriented electrospun nanofibers.

Description

Method for preparing aligned electrospun nanofibers and electrospinning device

technical field

The invention relates to a spinning process and equipment, in particular to a processing method and device for preparing superfine fibers, which are applied in fields such as textiles, biomedical materials, filtration and protection, catalysis, food engineering, and cosmetics.

Background technique

Electrospinning technology is a technology to obtain nanofibers under high voltage electric field. It began in the 1930s and emerged in the 1990s. Because of its simple preparation process and low cost, it has attracted more and more attention from researchers. Initially it was mainly used in production and research in the textile field. With the progress of research, electrospinning technology has been introduced into the preparation of functional materials, such as field effect diodes and other materials. In recent years, its application in the preparation of inorganic materials has gradually been favored by researchers due to the characteristics and wide application prospects of inorganic electrospun nanofibers in terms of light, heat, electricity, physics and chemistry, such as MgO, NiO , ZnO and carbon nanotube electrospun fibers have become the main research objects. In addition, the application in biomedicine, especially as a scaffold material for cell tissue, has also become one of the research hotspots of electrospinning technology.

In the application of biomedical materials and inorganic functional nanofibers, there are strict requirements on the structure and morphology of the fibers, especially the orientation of the fibers. Oriented electrospun nanofibers are more suitable for their application requirements in biomedicine and functional devices.

In the field of textiles, in order to obtain aligned fiber bundles, research on aligned electrospun nanofibers has been carried out earlier. Electrospun nanofibers with different degrees of alignment can be obtained by using a high-speed rotating collection device, using an aluminum conical disk, a triangular rotating frame, a rotating drum made of a copper wire frame, and parallel electrodes.

Contents of the invention

In order to solve the problems of the prior art, the object of the present invention is to overcome the deficiencies in the prior art, and provide a preparation method and an electrospinning device for aligning electrospun nanofibers. The material is prepared by folding a metal collection sheet method, which is about to collect The device--the metal sheet is folded like a fan, and then used as a collecting plate to collect nanofibers to obtain aligned electrospun nanofibers.

In order to achieve the above invention creation purpose, the present invention adopts the following technical solutions:

A preparation method for aligned electrospun nanofibers, characterized in that it comprises the following steps:

a. Fold the metal collection sheet, then clean it, and put it in a dry box for subsequent use; the section of the metal collection sheet prepared by folding is preferably jagged; the metal collection sheet used is preferably aluminum foil or copper foil;

b. Prepare polymer solution as electrospinning solution;

c. Inject the electrospinning solution prepared in the above step b into the electrospinning device;

d. Use the folded metal collection sheet prepared in the above step a as a collection plate, turn on the electrospinning device, under the action of an applied electric field with a voltage of 10-20KV, and under the condition of a collection distance of 10-30 cm, The aligned electrospun nanofibers are collected on the metal collection sheet, and the nanofibers of the desired shape are obtained by adjusting the direction of the metal collection sheet; adjusting the direction of the metal collection sheet is preferably achieved by changing the placement angle of the metal collection sheet.

As a further preferred technical solution of the above-mentioned technical solution of the present invention, the aligned electrospun nanofibers collected on the above-mentioned folded metal collection sheet are linear, cross-shaped, square-shaped or radial.

As a further preferred technical solution of the above technical solution of the present invention, in the above step b, the prepared high polymer solution is a single high molecular polymer solution, a mixed solution of different high polymers or a mixed solution of high polymers and inorganic substances .

The present invention also provides an electrospinning device for implementing the preparation method of aligned electrospun nanofibers, including a high-voltage power supply, a capillary injection device and a collector, the collector is grounded, and the electrospinning solution is injected into the capillary injection device. Power supply, apply an electric field in the nanofiber generation and collection space between the capillary jet device and the collector, so that the electrospinning solution droplet at the nozzle of the capillary jet device is elongated from a spherical shape to a cone shape, forming a Taylor cone, when When the electric field strength increases to the set critical value, the solution jet is sprayed from the Taylor cone, and the solution jet is further rapidly thinned under the action of the electric field to form a spread electrospinning. The collector is folded from a metal sheet to form a metal collection sheet carrier. Change the position and direction of the metal sheet through the direction control device to adjust the position and angle of the collector relative to the solution jet, so that the collection distance is kept between 10-30 cm. Under the action of an external electric field with a voltage of 10-20KV, A regular electrospinning electric field distribution is formed in the space area adjacent to the collector to guide the spread electrospinning filaments with a diameter of nanometers ejected from the Taylor cone, and to be regularly oriented in a set direction and scattered on the collector. On the protrusions and grooves, so that the nanofibers of the desired shape are obtained in the collector.

In the above-mentioned electrospinning device of the present invention, the section of the metal sheet constituting the collector is preferably zigzag, and aligned electrospun nanofibers are prepared at the protrusions and grooves of the zigzag collector.

In the above-mentioned electrospinning device of the present invention, aluminum foil or copper foil is preferably used as the metal sheet constituting the collector.

Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages:

1. The present invention does not need to install or refit the electrospinning device, only needs to slightly modify the collection device--the metal collection sheet, change the distribution of the electrospinning electric field, and guide the directional arrangement of the electrospinning sprayed from the needle of the capillary injection device, Preparation of aligned electrospun nanofibers;

2. The present invention can prepare nanofibers of complex shapes by adjusting the position of the collector and the inclination angle of the space according to actual needs, and can realize the customization of linear, cross-shaped, rice-shaped or radial electrospun nanofibers, and can According to actual needs, nanofibers with complex shapes can be prepared by adjusting the placement position of the collecting device.

Description of drawings

Fig. 1 is a schematic structural diagram of an electrospinning device according to Embodiment 1 of the present invention.

Detailed ways

Preferred embodiments of the present invention are described in detail as follows:

Embodiment one:

In this embodiment, referring to FIG. 1, an electrospinning device includes a high-voltage power supply 1, a capillary jet device 2, and a collector 6. The collector 6 is grounded, and the electrospinning solution is injected into the capillary jet device 2. By controlling the high-voltage The power source 1 applies an electric field in the nanofiber generation and collection space between the capillary jet device 2 and the collector 6, so that the electrospinning solution droplet at the nozzle of the capillary jet device 2 is elongated from a spherical shape to a cone shape, forming Taylor cone 3, when the electric field strength increases to a set critical value, the solution jet 4 is ejected from the Taylor cone 3, and the solution jet 4 is further rapidly thinned under the action of the electric field to form a spread electrospinning 5, and the collector 6 The metal collecting sheet carrier is formed by folding the metal sheet, and the position and direction of the metal sheet are changed by the direction control device to adjust the position and angle of the collector 6 relative to the solution jet 4, so that the collecting distance is kept between 10-30 cm. Under the action of an applied electric field with a voltage of 10-20KV, a regular electrospinning electric field distribution is formed in the space area adjacent to the collector 6, guiding the spread electrospinning 5 with a diameter of nanometers ejected from the Taylor cone 3, The nanofibers are regularly arranged in a set direction and scattered on the upper protrusions and grooves of the collector 6 , so that the nanofibers of the desired shape are obtained in the collector 6 .

Use the electrospinning device of this embodiment to carry out the preparation method of aligned electrospun nanofibers, comprising the following steps:

a. Fold the aluminum foil into a zigzag shape, put it in acetone, ethanol and distilled water for ultrasonic degreasing for 20 minutes, rinse again with distilled water and put it in a vacuum drying oven for later use;

b. The solution of the polymer or its mixture is configured as an electrospinning solution;

c. Inject the electrospinning solution prepared in the above step b into the electrospinning device, and install the processed aluminum foil on the electrode shown in Figure 1, adjust the receiving distance to 15cm, and the voltage to 18KV, and carry out Electrospinning, a layer of nanofibers is received on the aluminum foil;

d. When receiving the spread electrospun yarn 5, the direction of the aluminum foil can be adjusted as required to obtain cross-shaped nanofibers.

Figure 1 is a schematic diagram of an electrospinning setup with a zigzag collector plate. In this embodiment, the zigzag collector 6 is used to change the electric field distribution during the electrospinning process, and the zigzag collector 6 is used to change the electric field distribution during the electrospinning process to guide the electrospinning to arrange in a specific direction. Preparation of aligned nanofibers. The process of the method in this embodiment is simple, and the electric field distribution can be customized by folding the aluminum foil used as the collector 6 to make it zigzag.

Embodiment two:

This embodiment is basically the same as Embodiment 1, especially in that:

In this example, the direction of the aluminum foil was adjusted as needed to obtain rice-shaped nanofibers, and nanofibers with more complex shapes than in Example 1 were prepared by adjusting the placement position of the collecting device.

Embodiment three:

This embodiment is basically the same as the previous embodiment, and the special features are:

In this example, the direction of the aluminum foil was adjusted as needed to obtain radial nanofibers, and nanofibers with more complex shapes than those in Examples 1 and 2 were prepared by adjusting the placement position of the collecting device.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and various changes can also be made according to the purpose of the invention of the present invention. The changes, modifications, substitutions, combinations, and simplifications should be equivalent replacement methods, as long as they meet the purpose of the present invention, as long as they do not deviate from the technical principle of the preparation method of oriented array electrospun nanofibers and the electrospinning device of the present invention and inventive concepts all belong to the protection scope of the present invention. the

Claims (9)

1. a preparation method who aligns electro spinning nano fiber, is characterized in that, comprises the following steps:

A. metal is collected to thin slice and fold, then clean, put into drying box standby;

B. prepare high polymeric solution as electrospinning solution;

C. the electrospinning solution of preparing is injected to electrostatic spinning apparatus in above-mentioned steps b;

D. the folding metal of preparing is collected to thin slice as collecting board in above-mentioned steps a, open electrostatic spinning apparatus, at voltage, be 10-20KV under DC Electric Field, and under the condition of collecting apart from 10-30 centimetre, at metal, collect the electro spinning nano fiber that on thin slice, collection aligns, and by adjusting the direction of metal collection thin slice, obtain the nanofiber of required form.

2. align according to claim 1 the preparation method of electro spinning nano fiber, it is characterized in that: the section of the metal of folding preparation collection thin slice is engrail in above-mentioned steps a.

3. align according to claim 2 the preparation method of electro spinning nano fiber, it is characterized in that: it is aluminium foil or Copper Foil that the metal adopting in above-mentioned steps a is collected thin slice.

4. according to the preparation method who aligns electro spinning nano fiber described in any one in claim 1～3, it is characterized in that: in above-mentioned steps d, adjust the placed angle that metal is collected for a change metal collection of the direction thin slice of thin slice.

5. align according to claim 4 the preparation method of electro spinning nano fiber, it is characterized in that: at folding metal, collecting the electro spinning nano fiber that aligns of collecting on thin slice is linear pattern, cross, rice font or radial.

6. according to the preparation method who aligns electro spinning nano fiber described in any one in claim 1～3, it is characterized in that: in above-mentioned steps b, prepared high polymeric solution is the mixed solution of single macromolecule polymer solution, different high polymers or the mixed solution of high polymer and inorganic matter.

7. one kind implements the claims the electrostatic spinning apparatus that aligns the preparation method of electro spinning nano fiber described in 1, comprise high voltage source (1), capillary injection apparatus (2) and collector (6), described collector (6) ground connection, electrospinning solution is injected to described capillary injection apparatus (2), by controlling high voltage source (1), in nanofiber generation between capillary injection apparatus (2) and described collector (6) and collection space, apply electric field action, the electrospinning solution droplets at the nozzle place of capillary injection apparatus (2) is elongated as taper by spherical, form taylor cone (3), when electric-field intensity is increased to the critical value of setting, from taylor cone (3), spray and form solution jet (4), solution jet (4) is formed by further rapid drawing-down the Electrospun (5) of sprawling under electric field action, it is characterized in that: described collector (6) is folded to form metal by sheet metal and collects wafer carrier, by direction-control apparatus, convert position and the direction of sheet metal, regulate described collector (6) with respect to position and the angle of solution jet (4), making to collect distance remains between 10-30 centimetre, at voltage, be 10-20KV under DC Electric Field, area of space at contiguous described collector (6) forms well-regulated electrostatic spinning Electric Field Distribution, guiding is the nano level Electrospun of sprawling (5) from the diameter of taylor cone (3) ejection, with the direction of setting, align regularly projection place and the groove that is scattered in described collector (6), thereby at described collector (6), obtain the nanofiber of required form.

8. electrostatic spinning apparatus according to claim 7, is characterized in that: the section that forms the sheet metal of described collector (6) is engrail, in high spot and the groove preparation of jagged gathering-device, aligns electro spinning nano fiber.

9. according to electrostatic spinning apparatus described in claim 7 or 8, it is characterized in that: the sheet metal that forms described collector (6) is aluminium foil or Copper Foil.