Preparation method for nuclear pore membrane having regularly arranged nuclear micropores

Abstract

A preparation method for a nuclear pore membrane having regularly arranged nuclear micropores, a radiation detector probe manufactured using the nuclear pore membrane, and a wave-absorbing material prepared using the nuclear pore membrane. Multiple single-pore nuclear pore membranes are used to prepare a dual-pore nuclear pore membrane having pores at a certain spacing, multiple dual-pore nuclear pore membranes are used to prepare a four-pore nuclear pore membrane having pores at a certain spacing and regularly arranged, and so on, a nuclear pore membrane having orderly arranged nuclear micropores is prepared using the principles of multiplication. An insulating material layer is sandwiched between two conductive material layers of a nuclear pore membrane or two sides of an insulating membrane are coated with conductive layers, and then orderly arranged nuclear micropores are formed, so as to obtain a radiation detector probe. Nuclear pore membranes having different pore sizes and taper angles are stacked and staggered to broaden the wavelength range of electromagnetic waves absorbed by the wave-absorbing material.

Description

Preparation method of nuclear pore membrane with regularly arranged nuclear micropores TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of nuclear engineering and nuclear technology, and particularly to a technical method for punching holes on a thin film material by using heavy ions such as neutrons or alpha particles and chemical etching. BACKGROUND

[0002] Currently, nuclear pore membranes, as a new type of material, have important applications in many fields, such as superfluid research, chemical separation, isotope separation, radiation dosimetry, biological engineering, medical research, mass spectrometry technology, heat insulation technology, purification technology, vacuum technology, uranium ore prospecting, electronic industry, pharmaceutical industry, and food industry. Improving the production quality of nuclear pore membranes will have a wide impact on different fields.

[0003] Currently, there are two main ways to produce nuclear pore membranes: one is to use a particle accelerator to accelerate heavy ions to bombard the film material, and the other is to use a neutron beam or fission fragments generated by a nuclear reactor to bombard the film material. After the film material is damaged by radiation, nuclear pore membranes are prepared by sensitization and chemical etching. However, the nuclear micropores on the produced nuclear pore membranes are randomly arranged. If the distribution of nuclear micropores on the membrane can be artificially controlled, and the pore spacing of nuclear micropores can be accurately controlled and arranged regularly, the production quality of nuclear pore membranes will be greatly improved. SUMMARY

[0004] Currently, the nuclear micropores on the produced nuclear pore membranes are randomly arranged. If the distribution of nuclear micropores on the membrane can be artificially controlled, and the pore spacing of nuclear micropores can be accurately controlled and arranged regularly, the production quality of nuclear pore membranes will be greatly improved, and will have a wide impact on different fields. Nuclear pore membranes with regularly arranged nuclear micropores also have unique applications, two of which are listed below.

[0005] Embodiments of the present application aim to provide a preparation method of nuclear pore membranes with regularly arranged nuclear micropores, to control the distribution of nuclear micropores on the membrane, accurately control the pore spacing of nuclear micropores, and arrange them regularly, which will greatly improve the production quality of nuclear pore membranes.

[0006] A new type of radiation detector probe made of nuclear pore membranes with regularly arranged nuclear micropores, characterized in that a nuclear pore membrane made of two layers of conductive material with an insulating material sandwiched in between can be used to make a new type of radiation detector probe. Alternatively, a conductive layer can be plated on both sides of an insulating material film, and then nuclear micropores arranged regularly can be punched on the film using this method, which can also be used to make a probe of the same type of radiation detector.

[0007] A wave-absorbing material made of nuclear pore membranes with regularly arranged nuclear micropores, characterized in that it includes: nuclear pore membranes with different pore diameters and pore cone angles that are stacked and staggered to expand the range of wavelengths that the wave-absorbing material can absorb.

[0008] To achieve the above objectives, the embodiments of the present invention mainly provide the following technical solutions:

[0009] Preparation of nuclear pore membranes with neatly arranged nuclear micropores:

[0010] The first step is to prepare a single-pore nuclear pore membrane. First, a conventional nuclear pore membrane with randomly distributed nuclear micropores is prepared, which can be achieved using gold foil (due to fewer transmitting particles). Under a scanning electron microscope, the sample is manipulated to align a single pore in the multilayered, randomly distributed nuclear pore membrane, forming an individual through-hole. The layers of material are then fixed to create a single-pore transmission membrane. The original membrane to be used as the single-pore nuclear pore membrane is placed behind the transmission membrane, and a particle beam is bombarded towards the front of the transmission membrane (lower energy levels are used to increase the success rate). A new sample membrane is removed from the back, and after sensitization and chemical etching (increasing the chemical etching time can increase the pore size of the nuclear micropores, which is beneficial to the success rate of the next step), a single-pore nuclear pore membrane is obtained. If unsuccessful, this sample membrane can be stacked again behind the single-pore transmission membrane to increase the thickness of the transmission membrane, and the above process can be repeated until a single-pore nuclear pore membrane is successfully prepared.

[0011] The second step involves fabricating a dual-pore nuclear membrane with precisely aligned micropore spacing. Multiple single-pore nuclear membranes are stacked and their micropores aligned to form through-holes (using as many single-pore membranes as possible increases the success rate), creating a new single-pore transmission membrane. The original membrane to be used as the dual-pore nuclear membrane is placed behind the single-pore transmission membrane, and particles are bombarded from the front of the transmission membrane. Under a scanning electron microscope, the original membrane is shifted 10 μm laterally, and the membrane is bombarded again with a particle beam. The new sample template is then removed, sensitized, and chemically etched to obtain the dual-pore nuclear membrane with a micropore spacing of 10 μm.

[0012] The third step is to fabricate a four-pore nuclear membrane with a consistent and orderly arrangement of nuclear micropores. Multiple two-pore nuclear membranes are stacked and their micropores aligned to form through-holes (the more the better), creating a new two-pore transmission membrane. The original membrane to be used as the four-pore nuclear membrane is placed behind the two-pore transmission membrane, and particles are bombarded from the front of the transmission membrane. Under a scanning electron microscope, the original membrane is shifted longitudinally by 10 μm, and it is bombarded again with a particle beam. A new sample template is then removed from the back, and after sensitization and chemical etching, a nuclear membrane with a consistent and orderly arrangement of nuclear micropores and a spacing of 10 μm is obtained.

[0013] Fourth step: Repeat the above process 27 times in total to obtain 1cm. 2 A nuclear pore membrane with a spacing of 10 μm and neatly arranged nuclear pores can be considered ready for mass production.

[0014] Applications of nuclear pore membranes with neatly arranged nuclear micropores:

[0015] A novel radiation detector probe is fabricated using a nuclear pore membrane with neatly arranged nuclear micropores. The probe is characterized by having a layer of insulating material sandwiched between two layers of conductive nuclear pore membranes prepared using this method. The spacing between the nuclear micropores on the three layers of membranes is consistent and corresponds one-to-one, thus forming a novel radiation detector probe. Alternatively, a similar radiation detector probe can be fabricated by depositing conductive layers on both sides of an insulating membrane and then using this method to create neatly arranged nuclear micropores on the membrane.

[0016] The microwave absorbing material made using a nuclear pore membrane with neatly arranged nuclear micropores is characterized by the following: for various materials, the pore size can be controlled by controlling the chemical etching time, and the inner cone angle of the nuclear micropores can be controlled by controlling the sensitization time. Therefore, once we can control the distribution of the nuclear micropores to make them neatly arranged, we can stack and interleave nuclear pore membranes with different pore sizes and cone angles to expand the range of electromagnetic wave wavelengths that the microwave absorbing material can absorb. Attached Figure Description

[0017] Figure 1 is a flowchart of the fabrication process of a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention.

[0018] Figure 2 is a structural diagram of the probe of the novel radiation detector according to an embodiment of the present invention.

[0019] Figure 3 is a structural diagram of the microwave absorbing material made using a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. In the following description, specific details such as specific materials, energy levels, and techniques are set forth for illustrative purposes and not for limitation, so as to provide a thorough understanding of the present invention. However, those skilled in the art will understand that the present invention can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known operating instruments, sensitization methods, etching methods, and materials are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0022] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Figure 1 is a flowchart illustrating the fabrication process of a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention. As shown in Figure 1, the nuclear pore membrane with neatly arranged nuclear micropores is prepared as follows:

[0025] The first step is to prepare a single-pore nuclear pore membrane. First, a conventional nuclear pore membrane with randomly distributed nuclear micropores is prepared, which can be achieved using gold foil (due to fewer transmitting particles). Under a scanning electron microscope, the sample is manipulated to align a single pore in the multilayered, randomly distributed nuclear pore membrane, forming an individual through-hole. The layers of material are then fixed to create a single-pore transmission membrane. The original membrane to be used as the single-pore nuclear pore membrane is placed behind the transmission membrane, and a particle beam is bombarded towards the front of the transmission membrane (lower energy levels are used to increase the success rate). A new sample membrane is removed from the back, and after sensitization and chemical etching (increasing the chemical etching time can increase the pore size of the nuclear micropores, which is beneficial to the success rate of the next step), a single-pore nuclear pore membrane is obtained. If unsuccessful, this sample membrane can be stacked again behind the single-pore transmission membrane to increase the thickness of the transmission membrane, and the above process can be repeated until a single-pore nuclear pore membrane is successfully prepared.

[0026] The second step involves fabricating a dual-pore nuclear membrane with a precisely aligned spacing between the nuclear micropores. Multiple single-pore nuclear membranes are stacked and their micropores aligned to form through-holes (using as many single-pore membranes as possible increases the success rate), creating a new single-pore transmission membrane. The original membrane to be used as the dual-pore nuclear membrane is placed behind the single-pore transmission membrane, and particles are bombarded from the front of the transmission membrane. Under a scanning electron microscope, the original membrane is shifted 10 μm laterally, and the membrane is bombarded again with a particle beam. The new sample template is then removed, sensitized, and chemically etched to obtain the dual-pore nuclear membrane with a 10 μm spacing between the nuclear micropores.

[0027] The third step is to fabricate a four-pore nuclear membrane with a consistent and orderly arrangement of nuclear micropores. Multiple two-pore nuclear membranes are stacked and their micropores aligned to form through-holes (the more the better), creating a new two-pore transmission membrane. The original membrane to be used as the four-pore nuclear membrane is placed behind the two-pore transmission membrane, and particles are bombarded from the front of the transmission membrane. Under a scanning electron microscope, the original membrane is shifted longitudinally by 10 μm, and it is bombarded again with a particle beam. A new sample template is then removed from the back, and after sensitization and chemical etching, a nuclear membrane with a consistent and orderly arrangement of nuclear micropores and a spacing of 10 μm is obtained.

[0028] Fourth step: Repeat the above process 27 times in total to obtain 1cm. 2The nuclear pore membrane has a spacing of 10 μm and is neatly arranged. It can be considered ready for mass production. Increasing the number of cycles can yield nuclear pore membranes with a larger area.

[0029] Figure 2 is a structural diagram of the probe of the novel radiation detector according to an embodiment of the present invention. A new transmission membrane is fabricated by stacking pre-made nuclear pore membranes with neatly arranged nuclear micropores. A PC film plated with gold on both sides is placed behind the transmission membrane. The front side of the transmission membrane is bombarded with a particle beam. After ultraviolet photosensitization, it is etched with a mixed etching solution of 0.3 mol / L potassium chromate and 8 mol / L sulfuric acid. The sample is then cleaned to fabricate the probe of this radiation detector.

[0030] Figure 3 is a structural diagram of the microwave absorbing material made using a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention. For various materials, the pore size can be controlled by controlling the chemical etching time, and the inner cone angle of the nuclear micropores can be controlled by controlling the sensitization time. Therefore, once we can control the distribution of the nuclear micropores to make them neatly arranged, we can stack and interleave nuclear pore membranes with different pore sizes and cone angles to expand the range of wavelengths that the microwave absorbing material can absorb.

[0031] Furthermore, the other components and functions of the method for preparing a nuclear pore membrane with neatly arranged nuclear micropores according to the embodiments of the present invention are known to those skilled in the art, and will not be described in detail in order to reduce redundancy.

[0032] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that, include: Preparation of single-pore membranes; preparation of nuclear pore membranes with two pores at a certain spacing using multiple single-pore nuclear pore membranes; By using multiple two-pore nuclear pore membranes, four-pore nuclear pore membranes with a fixed pore spacing and neat arrangement can be prepared... and so on, using the multiplication principle to prepare the required nuclear pore membranes with neatly arranged nuclear micropores.

2. A novel radiation detector probe made using a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that, Using this method, a novel radiation detector probe can be fabricated by sandwiching an insulating layer between two layers of conductive nuclear pore membranes. Alternatively, a similar radiation detector probe can be fabricated by depositing conductive layers on both sides of an insulating membrane and then using this method to punch neatly arranged nuclear micropores in the membrane.

3. A microwave absorbing material made using a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that, include: The overlapping and staggered arrangement of nuclear pore membranes with different pore sizes and cone angles expands the range of electromagnetic wave wavelengths that the absorbing material can absorb.

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