Preparation method of nuclear pore membrane with orderly arranged nuclear micropores

Abstract

The embodiment of the invention discloses a preparation method of a nuclear track membrane with orderly arranged nuclear micropores. The preparation method of the nuclear track membrane with orderly arranged nuclear micropores comprises the following steps: preparing a single-pore membrane; preparing a nuclear track membrane with two holes at a certain interval by utilizing a plurality of single-hole nuclear track membranes; a plurality of two-hole nuclear track membranes are used for preparing a four-hole nuclear track membrane which has a certain hole distance and is arranged in order, and so on, so that the required nuclear track membrane with nanoholes arranged in order is prepared. Nuclear micropores of a nuclear track membrane prepared by a traditional method are uncontrollable in number and disordered in distribution, and the nuclear track membrane plays an important role in multiple fields such as medicine, military industry and nuclear technology, such as production of semi-permeable membranes and wave-absorbing materials. No matter what membrane material is, the production quality of the nuclear track membrane can be improved by the method provided by the invention. A novel probe of a radiation detector can be manufactured by clamping a layer of nuclear track membrane made of an insulating material between two layers of nuclear track membranes made of conductive materials prepared by the method. Or conductive layers are plated on the two surfaces of a film made of an insulating material, and nuclear micropores which are arranged in order are punched on the film by using the method, so that the probe of the radiation detector of the same type can be manufactured. Nuclear track membranes with different pore diameters and pore taper angles are overlaid and arranged in a staggered manner, so that the range of the wavelength of electromagnetic waves absorbed by the wave-absorbing material is expanded.

Description

Technical Field

[0001] The embodiments of the present invention relate to the fields of nuclear engineering and nuclear technology, and specifically to a technical method for drilling holes and chemically etching thin film materials using heavy ions such as neutrons or alpha particles. Background Art

[0002] At present, as a new type of material, nuclear pore membrane has important applications in many fields, such as superfluid research, chemical separation, isotope separation, radiation dosimetry, bioengineering, medical research, mass spectrometry technology, insulation technology, purification technology, vacuum technology, uranium ore survey, electronics industry, pharmaceutical industry and food industry, etc. Improving the production quality of nuclear pore membrane will have a wide range of impacts on different fields.

[0003] At present, there are two main ways to produce nuclear pore membranes. One is to use particle accelerators to accelerate heavy ions to bombard membrane materials, and the other is to use neutron beams or fission fragments produced by nuclear reactors to bombard membrane materials. After the membrane material is damaged by radiation, the nuclear pore membrane is prepared by sensitization and chemical etching. However, the arrangement of nuclear micropores on the produced nuclear pore membrane is messy. If the distribution of nuclear micropores on the membrane can be artificially controlled, the pore spacing of nuclear micropores can be accurately controlled and arranged neatly, the production quality of the nuclear pore membrane will be greatly improved. Summary of the invention

[0004] The nuclear micropores on the nuclear pore membranes currently produced are arranged in a disorderly manner. If the distribution of nuclear micropores on the membrane can be controlled artificially, the pore spacing of the nuclear micropores can be precisely controlled and arranged neatly, the production quality of the nuclear pore membranes will be greatly improved and will have a wide range of impacts in different fields. Nuclear pore membranes with neatly arranged nuclear micropores also have unique applications, two of which are listed below.

[0005] The purpose of the embodiment of the present invention is to provide a method for preparing a nuclear pore membrane with neatly arranged nuclear micropores, so as to control the distribution of nuclear micropores on the membrane, accurately control the pore spacing of the nuclear micropores and arrange them neatly, which will greatly improve the production quality of the nuclear pore membrane.

[0006] A new type of radiation detector probe is made by using a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that a nuclear pore membrane made of an insulating material is sandwiched between two layers of nuclear pore membranes made of conductive materials prepared by this method to make a new type of radiation detector probe. Alternatively, a conductive layer is plated on both sides of a membrane of an insulating material, and then neatly arranged nuclear micropores are punched on the membrane by this method to make a probe of the same type of radiation detector.

[0007] The wave absorbing material made of a nuclear pore membrane with neatly arranged nuclear micropores is characterized by comprising: nuclear pore membranes with different pore diameters and pore cone angles are stacked and arranged in a staggered manner 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 membrane with neatly arranged nuclear micropores:

[0010] The first step is to prepare a single-hole nuclear pore membrane. First, make an ordinary nuclear pore membrane with randomly distributed nuclear micropores. Gold foil (fewer transmissive particles) can be used. Manipulate the sample under a scanning electron microscope to align a single hole in the nuclear pore membrane with multiple layers of randomly distributed nuclear micropores to form a separate through hole, fix each layer of material membrane, and make a single-hole transmissive membrane. Place the original membrane to be prepared into a single-hole nuclear pore membrane behind the transmissive membrane, bombard the front of the transmissive membrane with a particle beam (low energy levels can be used to increase the success rate), remove the new sample membrane behind, and after sensitization and chemical etching (increasing the time of chemical etching can increase the pore size of the nuclear micropores, which is beneficial to the success rate of the next step), you can get a single-hole nuclear pore membrane. If it is unsuccessful, you can continue to superimpose this sample membrane on the single-hole transmissive membrane, increase the thickness of the transmissive membrane, and repeat the above process again until a nuclear pore membrane with a single nuclear micropore is successfully made.

[0011] The second step is to make a double-hole nuclear pore membrane with a certain spacing between nuclear micropores and neat arrangement. Multiple single-hole nuclear pore membranes are stacked and the nuclear micropores are aligned to form through holes (the number of single-hole nuclear pore membranes is as large as possible to increase the success rate) to make a new single-hole transmission membrane. The original membrane to be prepared into a double-hole nuclear pore membrane is placed behind the single-hole transmission membrane, and particles are bombarded from the front of the transmission membrane. Under the scanning electron microscope, the original membrane behind is moved horizontally by 10μm, bombarded with a particle beam again, and the new sample mold behind is removed. After sensitization and chemical etching, a double-hole nuclear pore membrane with a nuclear micropore spacing of 10μm can be obtained.

[0012] The third step is to make a four-hole nuclear pore membrane with a certain spacing between nuclear micropores and neat arrangement. Multiple double-hole nuclear pore membranes are stacked and the nuclear micropores are aligned to form through holes (as many as possible) to make a new double-hole transmission membrane. The original membrane to be prepared into a four-hole nuclear pore membrane is placed behind the double-hole transmission membrane, and particles are bombarded from the front of the transmission membrane. Under the scanning electron microscope, the original membrane behind is moved vertically by 10μm, bombarded with a particle beam again, and the new sample mold behind is removed. After sensitization and chemical etching, a nuclear pore membrane with a spacing of 10μm between nuclear micropores and neat arrangement can be obtained.

[0013] Step 4: Repeat the above process for a total of 27 cycles to get 1cm 2 The nuclear pore membrane has a 10μm spacing between the nuclear micropores and is neatly arranged. It can be considered to have entered mass production.

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

[0015] A new type of radiation detector probe is made by using a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that a nuclear pore membrane made of insulating material is sandwiched between two layers of nuclear pore membranes made of conductive material prepared by this method, and the nuclear micropores on the three layers of nuclear pore membranes are spaced uniformly and one-to-one, thus making a new type of radiation detector probe. Alternatively, a conductive layer is plated on both sides of a membrane of insulating material, and then neatly arranged nuclear micropores are punched on the membrane by this method, so as to make a probe of the same type of radiation detector.

[0016] The absorbing material made of nuclear pore membrane with neatly arranged nuclear micropores is characterized by: 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 make nuclear pore membranes with different pore sizes and cone angles overlap and arrange them in a staggered manner, thereby expanding the range of electromagnetic wave wavelengths that the absorbing material can absorb. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart for preparing a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention.

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

[0019] Figure 3 This is a structural diagram of a wave-absorbing material made of a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] In the following description, specific details such as specific materials, energy levels, and techniques are provided for the purpose of illustration rather than limitation so as to provide a thorough understanding of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, 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 details.

[0022] In the description of the present invention, it should be understood that the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Figure 1 This is a flow chart of preparing a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention. Figure 1 As shown, a nuclear pore membrane with neatly arranged nuclear micropores is prepared:

[0025] The first step is to prepare a single-hole nuclear pore membrane. First, make an ordinary nuclear pore membrane with randomly distributed nuclear micropores. Gold foil (fewer transmissive particles) can be used. Manipulate the sample under a scanning electron microscope to align a single hole in the nuclear pore membrane with multiple layers of randomly distributed nuclear micropores to form a separate through hole, fix each layer of material membrane, and make a single-hole transmissive membrane. Place the original membrane to be prepared into a single-hole nuclear pore membrane behind the transmissive membrane, bombard the front of the transmissive membrane with a particle beam (low energy levels can be used to increase the success rate), remove the new sample membrane behind, and after sensitization and chemical etching (increasing the time of chemical etching can increase the pore size of the nuclear micropores, which is beneficial to the success rate of the next step), you can get a single-hole nuclear pore membrane. If it is unsuccessful, you can continue to superimpose this sample membrane on the single-hole transmissive membrane, increase the thickness of the transmissive membrane, and repeat the above process again until a nuclear pore membrane with a single nuclear micropore is successfully made.

[0026] The second step is to make a double-hole nuclear pore membrane with a certain spacing between nuclear micropores and neat arrangement. Multiple single-hole nuclear pore membranes are stacked and the nuclear micropores are aligned to form through holes (the number of single-hole nuclear pore membranes is as large as possible to increase the success rate) to make a new single-hole transmission membrane. The original membrane to be prepared into a double-hole nuclear pore membrane is placed behind the single-hole transmission membrane, and particles are bombarded from the front of the transmission membrane. Under the scanning electron microscope, the original membrane behind is moved horizontally by 10μm, bombarded with a particle beam again, and the new sample mold behind is removed. After sensitization and chemical etching, a double-hole nuclear pore membrane with a nuclear micropore spacing of 10μm can be obtained.

[0027] The third step is to make a four-hole nuclear pore membrane with a certain spacing between nuclear micropores and neat arrangement. Multiple double-hole nuclear pore membranes are stacked and the nuclear micropores are aligned to form through holes (as many as possible) to make a new double-hole transmission membrane. The original membrane to be prepared into a four-hole nuclear pore membrane is placed behind the double-hole transmission membrane, and particles are bombarded from the front of the transmission membrane. Under the scanning electron microscope, the original membrane behind is moved vertically by 10μm, bombarded with a particle beam again, and the new sample mold behind is removed. After sensitization and chemical etching, a nuclear pore membrane with a spacing of 10μm between nuclear micropores and neat arrangement can be obtained.

[0028] Step 4: Repeat the above process for a total of 27 cycles to get 1cm 2The nuclear pore membrane has a 10μm spacing between the nuclear micropores and is neatly arranged. It can be considered that it has entered mass production, and increasing the number of cycles can produce a larger nuclear pore membrane.

[0029] Figure 2 This is a structural diagram of the probe of the novel radiation detector of the embodiment of the present invention. A new transmission film is made by stacking the already manufactured nuclear pore membrane with neatly arranged nuclear micropores, and a PC film with gold-plated surfaces on both sides is placed behind the transmission film. The front of the transmission film is bombarded with a particle beam, and after ultraviolet sensitization, it is etched with a mixed etching solution of 0.3 mol / L potassium chromate and 8 mol / L sulfuric acid, and the sample is cleaned to make the probe of the radiation detector.

[0030] Figure 3 This is a structural diagram of an absorbent material made of a nuclear pore membrane with neatly arranged nuclear micropores according to an embodiment of the present invention. For various materials, controlling the chemical etching time can control the pore size, and controlling the sensitization time can control the inner cone angle of the nuclear micropores. Therefore, once we can control the distribution of nuclear micropores to make them neatly arranged, we can make nuclear pore membranes with different pore sizes and cone angles overlap and arrange them in a staggered manner, thereby expanding the range of wavelengths that the absorbent material can absorb.

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

[0032] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in 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-hole membrane; using multiple single-hole nuclear pore membranes to prepare a nuclear pore membrane with two holes at a certain distance; A plurality of two-pore nuclear pore membranes are used to prepare a four-pore nuclear pore membrane with a certain pore spacing and neatly arranged... and so on, the multiplication principle is used to prepare the required nuclear pore membrane with neatly arranged nuclear micropores.

2. A new type of radiation detector probe made of a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that: A new type of radiation detector probe can be made by sandwiching a nuclear pore membrane made of insulating material between two layers of nuclear pore membranes made of conductive materials prepared by this method. Alternatively, conductive layers are plated on both sides of a membrane of insulating material, and then this method is used to punch neatly arranged nuclear micropores on the membrane to make the probe of the same type of radiation detector.

3. A wave absorbing material made of a nuclear pore membrane with neatly arranged nuclear micropores, characterized in that: include: The core pore membranes with different pore diameters and pore cone angles are stacked and arranged in a staggered manner, thereby expanding the range of electromagnetic wave wavelengths that the absorbing material can absorb.

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