A method for preparing a nuclear pore membrane with neatly arranged nuclear micropores

Abstract

This invention discloses a method for preparing a nuclear pore membrane with neatly arranged nuclear micropores. The method includes: preparing a single-pore membrane; preparing a nuclear pore membrane with two pores at a certain spacing using multiple single-pore membranes; preparing a nuclear pore membrane with four pores of a certain spacing and neat arrangement using multiple two-pore membranes, and so on, to produce the desired nuclear pore membrane with neatly arranged nanopores. Traditional methods produce nuclear pore membranes with uncontrollable numbers and disordered distribution of nuclear micropores. Nuclear pore membranes play an important role in many fields such as medicine, military industry, and nuclear technology, for example, in the production of semi-permeable membranes and microwave absorbing materials. Regardless of the membrane material, this invention can improve the production quality of nuclear pore membranes. A nuclear pore membrane made by sandwiching an insulating material between two layers of conductive material can be used to fabricate a probe for a novel radiation detector. Alternatively, a conductive layer can be deposited on both sides of an insulating membrane, and then this method can be used to punch neatly arranged nuclear micropores on the membrane to fabricate a probe for a similar type of radiation detector. By stacking and arranging nuclear pore membranes with different pore sizes and cone angles in an alternating manner, the range of electromagnetic wave wavelengths that the absorbing material can absorb is expanded.

Description

Technical Field

[0001] The embodiments of the present invention relate to the fields of nuclear engineering and nuclear technology, specifically to the technical methods of drilling and chemical etching on thin film materials using heavy ions such as neutrons or alpha particles. Background Technology

[0002] Currently, nuclear pore membranes, as a novel material, have important applications in many fields, such as superfluidity research, chemical separation, isotope separation, radiation dosimetry, bioengineering, medical research, mass spectrometry, thermal insulation, purification, vacuum technology, uranium exploration, electronics, pharmaceuticals, and food processing. Improving the production quality of nuclear pore membranes will undoubtedly have a wide-ranging impact on these diverse fields.

[0003] Currently, there are two main methods for producing nuclear pore membranes: one is to bombard the membrane material with heavy ions accelerated by a particle accelerator, and the other is to bombard the membrane material with neutron beams or fission fragments generated by a nuclear reactor. After radiation damage to the membrane material, sensitization and chemical etching methods are used to prepare the nuclear pore membrane. However, the arrangement of nuclear micropores on the produced nuclear pore membranes is random. If the distribution of nuclear micropores on the membrane can be artificially controlled, and the spacing between the nuclear micropores can be precisely controlled to make them arranged in a neat manner, the production quality of the nuclear pore membrane will be greatly improved. Summary of the Invention

[0004] Currently produced nuclear pore membranes have a random arrangement of nuclear micropores. If the distribution of nuclear micropores on the membrane could be artificially controlled, and the spacing between the micropores could be precisely controlled to ensure a neat arrangement, the production quality of nuclear pore membranes would be greatly improved, and this would have a wide-ranging impact on various fields. Nuclear pore membranes with neatly arranged nuclear micropores also have unique applications, two of which are listed below.

[0005] The purpose of this invention is to provide a method for preparing a nuclear pore membrane with neatly arranged nuclear micropores, which controls the distribution of nuclear micropores on the membrane, precisely controls the spacing between nuclear micropores and makes them neatly arranged, thereby greatly improving the production quality of the nuclear pore membrane.

[0006] 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 membrane prepared using this method. 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.

[0007] A microwave absorbing material made using a nuclear pore membrane with neatly arranged nuclear micropores is characterized by comprising: nuclear pore membranes with different pore diameters and cone angles stacked and arranged alternately to expand the range of wavelengths that the microwave 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 transmitted 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 for 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 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.

[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 number of through-holes should be as large as possible) to create 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 behind it 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 pore spacing of 10 μm is obtained.

[0013] Fourth step: Repeat the above process 27 times in total to obtain 1cm. 2 The nuclear pore membrane has a spacing of 10 μm and is neatly arranged. It 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 This is a flowchart illustrating the fabrication process of a nuclear pore membrane with neatly arranged nuclear micropores, as described in an embodiment of the present invention.

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

[0019] Figure 3 This is a structural diagram of a 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] In the following description, specific details such as particular materials, energy levels, and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the invention. However, those skilled in the art will appreciate that the invention can 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 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 This is a flowchart illustrating the fabrication process of a nuclear pore membrane with neatly arranged nuclear micropores, as described in an embodiment of the present invention. Figure 1 As shown, a nuclear pore membrane with neatly arranged nuclear micropores was prepared:

[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 transmitted 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 for 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 number of through-holes should be as large as possible) to create 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 behind it 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 pore 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 This is a structural diagram of the probe of a 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, followed by ultraviolet photosensitization. Then, 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 This is a structural diagram of a 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, thereby expanding 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: The first step is to prepare a single-pore nuclear pore membrane. First, a nuclear pore membrane with randomly distributed nuclear micropores is prepared. The sample is manipulated under a scanning electron microscope to align a single pore of the multilayer randomly distributed nuclear micropore membrane to form an individual through-hole. The material layers are fixed to form a single-pore transmission membrane. The original membrane to be prepared into a single-pore nuclear pore membrane is placed behind the transmission membrane, and a particle beam is bombarded on the front of the transmission membrane. The new sample membrane behind it is removed. After sensitization and chemical etching, the single-pore nuclear pore membrane can be obtained. If it is not successful, this sample membrane can be stacked on the single-pore transmission membrane to increase the thickness of the transmission membrane. The above process is repeated until a single-pore nuclear pore membrane is successfully prepared. The second step is to fabricate a dual-pore nuclear membrane with a fixed spacing between the nuclear micropores. Multiple single-pore nuclear membranes are stacked and the nuclear micropores are aligned to form through-holes, thus creating a new single-pore transmission membrane. The original membrane to be fabricated into a dual-pore nuclear membrane is placed behind the single-pore transmission membrane, and particles are bombarded on the front of the transmission membrane. The operation is performed under a scanning electron microscope. The original membrane behind it is moved laterally a certain distance and bombarded again with a particle beam. The new sample template behind it is removed. After sensitization and chemical etching, a dual-pore nuclear membrane with a fixed spacing between the nuclear micropores can be obtained. The third step is to fabricate a four-pore nuclear membrane with a fixed spacing between the nuclear micropores and a neat arrangement. Multiple two-pore nuclear membranes are stacked and the nuclear micropores are aligned to form through holes, thus creating a new two-pore transmission membrane. The original membrane to be fabricated into a four-pore nuclear membrane is placed behind the two-pore transmission membrane, and particles are bombarded on the front of the transmission membrane. The operation is performed under a scanning electron microscope. The original membrane behind it is moved longitudinally a certain distance and bombarded again with a particle beam. The new sample membrane behind it is removed. After sensitization and chemical etching, a four-pore nuclear membrane with a fixed spacing between the nuclear micropores and a neat arrangement can be obtained. Fourth, repeat the above process multiple times to obtain a nuclear pore membrane with a fixed spacing between nuclear micropores and a neat arrangement.

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