Moon permanent shadow region water molecule adsorption and desorption experiment method

Abstract

The invention discloses a moon permanent shadow region water molecule adsorption and desorption experiment method, and relates to the field of space environment simulation. The method solves the problem that the existing simulant preparation method is low in conformity with the real formation of lunar soil water ice, so that the difference between the physical property index and the theoretical value of the real lunar soil water ice is large. The method comprises the following steps: putting an experimental sample array into the deep hypothermia vacuum environment simulation cabin; constructing a deep hypothermia vacuum environment, injecting micro-quantitative water molecules into the array to adjust the water molecule atmosphere, starting an adsorption experiment after the environmental conditions meet the experiment requirements, and packaging and transferring an adsorption experiment sample after T1; after packaging is completed, residual water molecules in the environment simulation cabin are extracted, and a clean vacuum environment is created again; simultaneously adjusting the sample temperature in the desorption sample area and the migration sample area to meet experimental conditions; and packaging and transferring a desorption experiment sample after the desorption experiment at T2 is continuously carried out, and packaging and transferring a migration experiment sample after the migration experiment at T3 is continuously carried out. The method is applied to the lunar exploration engineering field.

Description

Technical Field

[0001] The invention relates to the field of space environment simulation, and in particular to an experimental method for adsorption and desorption of water molecules in a permanent shadow area of ​​the moon. Background Art

[0002] Since the beginning of the 21st century, humans have proved through long-distance remote sensing that there is natural water in the permanent shadow areas at the north and south poles of the moon, and it exists in the lunar soil profile in the physical form of ice-soil aggregates. Why is there natural water in the ultra-high vacuum conditions of the moon? The scientific mechanism is believed to be due to the following three conditions: first, the extremely low temperature and no light environment in the permanent shadow area provide the cold trap condensation conditions for water substances; second, there must be a thin water molecule injection flow from the world; third, physical effects such as cold trap capture, adsorption deposition and cold end migration occur between water molecules and lunar soil particles.

[0003] Evidence from planetary science and remote sensing exploration shows that the lowest temperature in the permanent shadow areas at the north and south poles of the moon can reach about 10 to 30K, and the atmospheric pressure on the lunar surface is 10 -10 Pa level, such extreme low temperature and vacuum conditions far exceed the research limits of the earth's frozen soil and conventional water material science. Under the low temperature and vacuum coupling conditions in the permanent shadow area of ​​the moon, complex physical effects such as cold trap capture, adsorption deposition, and cold end migration may occur between the dilute water molecules from global free diffusion and the lunar soil particles, thus forming a stable ice-soil aggregate. Due to the limitations of deep space exploration capabilities, humans have not yet obtained field sampling and detailed investigation evidence of lunar soil water ice materials. The causes and evolution mechanisms of ice-soil materials in the permanent shadow area of ​​the moon, as well as the factors affecting the comprehensive physical properties of ice-soil aggregates by environmental-material factors, are still unclear.

[0004] In order to meet the major needs of scientific investigation, resource mining and utilization of ice-soil materials in the permanent shadow area of ​​the moon, it is urgent to solve basic problems such as simulation of lunar soil water ice materials, comprehensive physical property testing and characterization of lunar soil water ice. Looking at the technical status of countries around the world, high-fidelity simulation of lunar soil water ice materials is a global problem. The current technical routes can be summarized into three categories: normal pressure water frozen ice, low-temperature ice mixed soil, and normal pressure steam condensation ice. They can basically meet the envelope simulation and engineering verification of the harsh mechanical requirements of lunar soil water ice. However, the preparation method and process conditions of the simulant are less consistent with the scientific mechanism of the real formation and evolution mechanism of lunar soil water ice, resulting in a large gap between the physical properties of the lunar soil water ice simulant, such as thermal-electrical-optical-desorption characteristics, and the theoretical predicted values ​​of real lunar soil water ice. Summary of the invention

[0005] The present invention aims at the problem that the existing simulant preparation methods and process conditions have a low degree of conformity with the scientific mechanism of the actual formation and evolution mechanism of lunar soil water ice, resulting in a large gap between the physical properties of the lunar soil water ice simulant, such as thermal-electrical-optical-desorption characteristics, and the theoretical predicted values ​​of the real lunar soil water ice. An experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon is proposed, and the method comprises:

[0006] Place the experimental sample array into a deep cryogenic vacuum environment simulation chamber;

[0007] Construct a deep cryogenic vacuum environment and inject a small amount of water molecules into the experimental sample array;

[0008] When the environmental conditions meet the experimental requirements, the adsorption experiment begins and lasts for T1 time;

[0009] After the adsorption experiment, the samples were packaged and transferred;

[0010] After the encapsulation is completed, the residual water molecules are extracted from the environmental simulation chamber; at the same time, the sample temperature in the desorption sample area and the migration sample area is adjusted to meet the experimental conditions;

[0011] Conduct a desorption experiment for T2 time, and after the desorption experiment is completed, encapsulate and transfer the desorption experiment samples;

[0012] A migration experiment was conducted for T3 time, and after the migration experiment was completed, the samples were packaged and transferred.

[0013] Furthermore, a preferred embodiment is proposed, wherein the number of the experimental sample arrays is 16.

[0014] Furthermore, a preferred method is proposed, wherein the sample array is divided into an adsorption zone and a desorption zone by a sample spacing zone, and samples in each zone are evenly arranged on the sample table; samples in the adsorption zone are used to adsorb ejected water molecules, and samples in the desorption zone are used for desorption experiments of water molecules at different temperatures.

[0015] Furthermore, a preferred embodiment is proposed, in which the deep low temperature vacuum environment is constructed by a vacuum pump and a refrigerator cold head.

[0016] Furthermore, a preferred method is proposed, wherein the concentration of micro-quantitative water molecules injected into the experimental sample array is 1.3x10 -9 g / cm 3 ~4.8x10 -6 g / cm 3 .

[0017] Furthermore, a preferred method is proposed, in which when the environmental conditions meet the experimental requirements, the adsorption experiment is started and lasts for T1 time, including:

[0018] The mass of water molecules adsorbed by the sample is characterized by the modified Hertz-Knudsen equation:

[0019]

[0020] Where A is the surface area of ​​the sample in m 2 ; p is the pressure of water molecules, unit is Pa; T is the temperature of water molecules, unit is K; M is the molar mass of water molecules, unit is kg / mol; R is the gas constant, unit is J / (mol·K);

[0021] In the experimental chamber, when the water molecule injection from the water molecule sublimation generator and the adsorption of the sample reach a state of equilibrium:

[0022]

[0023] The pressure of water molecules in the cabin is:

[0024]

[0025] Among them, P sat is the saturated vapor pressure, in Pa; S v is the specific surface area, m 2 / g; a is the sublimation coefficient of water ice.

[0026] Furthermore, a preferred method is proposed, wherein the desorption experiment for T2 time includes: setting the initial temperature of the sample, the concentration of water molecules, mineral components, density, and particle size in a deep low temperature vacuum environment simulation chamber.

[0027] Furthermore, a preferred method is proposed, wherein the migration experiment of T3 time comprises: setting the initial temperature gradient of the sample, and simulating the mineral composition, density and particle size in the deep low temperature vacuum environment simulation chamber.

[0028] Based on the same inventive concept, the present invention also proposes a computer device, including a memory and a processor, wherein the memory stores a computer program. When the processor runs the computer program stored in the memory, the processor executes an experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon as described in any one of the above items.

[0029] Based on the same inventive concept, the present invention also proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of an experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon as described in any of the above items are executed.

[0030] The present invention is beneficial in that:

[0031] The present invention proposes an experimental method for the adsorption and desorption of water molecules in the permanent shadow zone of the moon, which can simulate the cold trap adsorption and deposition process of water molecules on the lunar soil surface under the deep low temperature vacuum conditions in the PSR, and study the influence of multiple factors on the adsorption rate, ice crystal type, ice soil cementation state, etc.

[0032] The present invention proposes an experimental method for the adsorption and desorption of water molecules in the permanent shadow zone of the moon, which can simulate the deep low temperature vacuum conditions in the PSR, the desorption process of water ice material in the lunar soil profile under the action of heat, and the influence of multiple factors on the sublimation rate, the change process of the ice soil cementation state, etc.

[0033] The present invention proposes an experimental method for the adsorption and desorption of water molecules in the permanent shadow zone of the moon, which can simulate the deep low-temperature vacuum conditions in the PSR, the migration and diffusion process of water ice materials in the longitudinal profile in the gradient temperature field, and study the influence of multiple factors on the migration direction, migration rate, etc.

[0034] The present invention proposes a method for the adsorption and desorption experiment of water molecules in the permanent shadow zone of the moon. The experimental samples are placed in a deep cryogenic vacuum environment simulation cabin, and a deep cryogenic vacuum environment is constructed to better simulate the special environment of the permanent shadow zone on the surface of the moon, thereby enhancing the authenticity and reliability of the experimental results. By injecting micro-quantitative water molecules into the experimental sample array, precise control of water molecules is achieved, making the experiment more accurate and controllable. In actual scenarios, the injection and adsorption of water molecules will affect the vacuum degree in the cabin. The precise control of the water molecule pressure is achieved by controlling the temperature inside the water molecule field sublimation generator and the surface area of ​​sample adsorption. The method includes three stages: adsorption experiment, desorption experiment and migration experiment. The adsorption, desorption and migration behaviors of water molecules under different conditions can be comprehensively examined, providing more experimental data and basis for understanding the true formation and evolution mechanism of water molecules in the permanent shadow zone of the moon.

[0035] The method of water molecule adsorption and desorption experiment in the permanent shadow area of ​​the moon proposed by the present invention can not only examine the thermal, electrical, optical and other properties of water molecules, but also study their adsorption and desorption characteristics, making the experimental results more comprehensive and more consistent with the physical properties of real lunar soil water ice. During the experiment, parameters such as environmental conditions and sample temperature are monitored and adjusted throughout the process to ensure the stability and accuracy of the experimental conditions and improve the repeatability and comparability of the experiment.

[0036] The present invention is applied to the field of lunar exploration engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of an experimental method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to implementation mode 1;

[0038] Figure 2Schematic diagram of the adsorption-migration-desorption experimental array design described in Implementation Method 3. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0040] Implementation method 1, see Figure 1 This embodiment describes an experimental method for the adsorption and desorption of water molecules in the permanent shadow region of the moon, the method comprising:

[0041] Place the experimental sample array into a deep cryogenic vacuum environment simulation chamber;

[0042] Construct a deep cryogenic vacuum environment and inject a small amount of water molecules into the experimental sample array;

[0043] When the environmental conditions meet the experimental requirements, the adsorption experiment begins and lasts for T1 time;

[0044] After the adsorption experiment, the samples were packaged and transferred;

[0045] After the encapsulation is completed, the residual water molecules are extracted from the environmental simulation chamber; at the same time, the sample temperature in the desorption sample area and the migration sample area is adjusted to meet the experimental conditions;

[0046] Conduct a desorption experiment for T2 time, and after the desorption experiment is completed, encapsulate and transfer the desorption experiment samples;

[0047] A migration experiment was conducted for T3 time, and after the migration experiment was completed, the samples were packaged and transferred.

[0048] The method proposed in this embodiment places the experimental samples into a deep cryogenic vacuum environment simulation cabin and constructs a deep cryogenic vacuum environment, which better simulates the special environment of the permanent shadow area on the lunar surface and enhances the authenticity and reliability of the experimental results. By injecting micro-quantitative water molecules into the experimental sample array, precise control of water molecules is achieved, making the experiment more accurate and controllable. In actual scenarios, the injection and adsorption of water molecules will affect the vacuum degree in the cabin. The precise control of the water molecule pressure is achieved by controlling the temperature inside the water molecule field sublimation generator and the surface area of ​​sample adsorption. This method includes three stages: adsorption experiment, desorption experiment and migration experiment. It can comprehensively examine the adsorption, desorption and migration behavior of water molecules under different conditions, and provide more experimental data and basis for understanding the true formation and evolution mechanism of water molecules in the permanent shadow area of ​​the moon.

[0049] The method proposed in this embodiment can not only examine the thermal, electrical, optical and other properties of water molecules, but also study their adsorption and desorption characteristics, making the experimental results more comprehensive and more consistent with the physical properties of real lunar soil water ice. During the experiment, parameters such as environmental conditions and sample temperature were monitored and adjusted throughout the process to ensure the stability and accuracy of the experimental conditions, and improve the repeatability and comparability of the experiment.

[0050] The experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon proposed in this embodiment can simulate the cold trap adsorption and deposition process of water molecules on the lunar soil surface under the deep low temperature vacuum conditions in the PSR, and study the influence of multiple factors on the adsorption rate, ice crystal type, ice soil cementation state, etc.

[0051] The experimental method for the adsorption and desorption of water molecules in the permanent shadow zone of the moon proposed in this embodiment can simulate the deep low temperature vacuum conditions in the PSR, the desorption process of water ice material in the lunar soil profile under the action of heat, and study the influence of multiple factors on the sublimation rate, the change process of ice soil cementation state, etc.

[0052] The experimental method for the adsorption and desorption of water molecules in the permanent shadow zone of the moon proposed in this embodiment can simulate the deep low temperature vacuum conditions in the PSR, the migration and diffusion process of water ice materials in the longitudinal profile in the gradient temperature field, and study the influence of multiple factors on the migration direction, migration rate, etc.

[0053] Implementation method 2: This implementation method further limits the experimental method for adsorption and desorption of water molecules in the permanent shadow area of ​​the moon described in implementation method 1, and the experimental sample array is 16.

[0054] Implementation method three, see Figure 2 Description of this embodiment. This embodiment is a further limitation of the experimental method for adsorption and desorption of water molecules in the permanent shadow area of ​​the moon described in Implementation Method 1. The sample array is divided into an adsorption area and a desorption area by a sample spacing area, and the samples in each area are evenly arranged on the sample table. The samples in the adsorption area are responsible for adsorbing the ejected water molecules, and the samples in the desorption area are responsible for the desorption experiment of water molecules at different temperatures. Due to cost constraints, the adsorption area and the desorption area are located in the same cabin. At the same time, the sample table has a rotation function, which can ensure the uniformity of the adsorption of water molecules in the sample area when the water molecules are not uniform enough at the beginning.

[0055] Dividing the sample array into adsorption and desorption zones helps organize and control the experimental process. This distinction makes the experimental process clearer and more orderly, ensuring the smooth progress of adsorption and desorption experiments.

[0056] By evenly arranging the samples on the sample stage and dividing them into adsorption and desorption zones, adsorption and desorption experiments can be performed simultaneously, thus improving the efficiency of the experiment. This parallel processing method helps save time and resources.

[0057] Arranging the samples in the adsorption zone and desorption zone separately can avoid mutual interference between samples in different zones, thereby improving the accuracy of the experimental results. Samples in each zone can be tested under relatively independent conditions, ensuring the reliability of the experimental data.

[0058] Implementation method 4: This implementation method further limits the experimental method for adsorption and desorption of water molecules in the permanent shadow area of ​​the moon described in implementation method 1. The deep low temperature vacuum environment is constructed by a vacuum pump and a refrigerator cold head.

[0059] In this embodiment, the vacuum pump is used to extract the air in the simulation chamber to create a vacuum environment. Different degrees of vacuum can be achieved by different types of vacuum pumps (such as rotary vane pumps, vortex pumps or molecular pumps). In this experiment, a vacuum pump is needed to reduce the pressure in the simulation chamber to an extremely low level to simulate a deep cryogenic vacuum environment.

[0060] The cryocooler cold head is used to reduce the temperature in the simulation chamber to achieve a deep cryogenic environment. Usually, the cryocooler cold head uses a refrigerant cycle to extract heat from the chamber, so that the chamber temperature can be quickly reduced to the required low temperature level. This can simulate a low to extremely low temperature environment, which is suitable for various experiments that require low temperature conditions.

[0061] Through the cooperation of the vacuum pump and the cold head of the refrigerator, it is possible to create a deep low temperature and vacuum environment at the same time, providing the necessary conditions for the experiment.

[0062] Embodiment 5: This embodiment further defines the method for adsorption and desorption of water molecules in the permanent shadow region of the moon described in Embodiment 1. The concentration of injecting a small amount of water molecules into the experimental sample array is 1.3x10 -9 g / cm 3 ~4.8x10 -6 g / cm 3 .

[0063] In this embodiment, the concentration range of the micro-quantitative water molecule injection experimental sample array is set, so that the concentration of water molecules in the experiment can be controlled within a precise range, which is conducive to simulating the actual situation on the lunar surface. This precise control helps to improve the repeatability and comparability of the experiment and ensure the accuracy of the experimental results.

[0064] The selected water molecule injection concentration range (1.3x10 -9 g / cm 3 ~4.8x10 -6 g / cm 3) takes into account the sparseness of water molecules in the extreme environment on the lunar surface, which is closer to the actual situation. This helps the experiment to more realistically simulate the adsorption and desorption process of water molecules on the lunar surface, thereby obtaining more reliable experimental results.

[0065] By limiting the concentration range of water molecules injected, experimenters can better adjust experimental conditions to suit different research purposes and experimental requirements. Such optimization helps improve the efficiency and scientificity of the experiment and provide more reliable data support for the study of lunar water ice.

[0066] Embodiment 6: This embodiment further limits the experimental method for adsorption and desorption of water molecules in the permanent shadow area of ​​the moon described in embodiment 1. When the environmental conditions meet the experimental requirements, the adsorption experiment is started and lasts for T1 time, including:

[0067] The mass of water molecules adsorbed by the sample is characterized by the modified Hertz-Knudsen equation:

[0068]

[0069] Where A is the surface area of ​​the sample in m 2 ; p is the pressure of water molecules, unit is Pa; T is the temperature of water molecules, unit is K; M is the molar mass of water molecules, unit is kg / mol; R is the gas constant, unit is J / (mol·K);

[0070] In the experimental chamber, when the water molecule injection from the water molecule sublimation generator and the adsorption of the sample reach a state of equilibrium:

[0071]

[0072] The pressure of water molecules in the cabin is:

[0073]

[0074] Among them, P sat is the saturated vapor pressure, in Pa; S v is the specific surface area, m 2 / g; a is the sublimation coefficient of water ice.

[0075] The modified Hertz-Knudsen equation can more accurately describe and predict the adsorption behavior of water molecules in low temperature and low pressure environments. This equation takes into account key parameters such as sample surface area, pressure and temperature of water molecules, and molar mass of water molecules, making experimental results more accurate and effectively guiding actual lunar exploration and research work.

[0076] In the experimental chamber, by monitoring the water molecule injection of the water molecule sublimation generator and the adsorption of the sample to reach a balanced state, the pressure of the water molecules in the chamber can be adjusted and controlled in real time. This method can simulate and explore the behavior of water molecules under different environmental conditions in the experiment, improving the scientificity and practicality of the experiment.

[0077] By controlling the adsorption balance of water molecules and precisely adjusting environmental parameters, the extreme environment of the permanent shadow area of ​​the moon can be better simulated. This highly controllable experimental setup enables researchers to gain a deeper understanding of the adsorption and migration mechanism of water molecules in the lunar soil, thus providing theoretical basis and technical support for future lunar exploration missions.

[0078] Using a modified version of the Hertz-Knudsen equation allows the experimenter to adjust the experimental design to accommodate new understanding gained from the experiment, such as adjusting sample surface area, temperature, or pressure to optimize experimental conditions and results.

[0079] Implementation method seven. This implementation method is a further limitation of the experimental method for adsorption and desorption of water molecules in the permanent shadow area of ​​the moon described in implementation method one. The desorption experiment for T2 time includes: setting the initial temperature of the sample, and simulating the concentration of water molecules, mineral composition, density, and particle size in the deep low temperature vacuum environment simulation cabin.

[0080] The accuracy of experimental conditions is ensured by setting parameters such as the initial temperature of the sample, the concentration of water molecules in the deep cryogenic vacuum environment simulation chamber, and the mineral composition, density, and particle size of the sample. This precise control can make the experimental results more reliable and provide higher reproducibility.

[0081] By adjusting the mineral composition, density and particle size of the samples, the properties of lunar surface materials can be simulated, making the experiment closer to the real lunar environment. This helps to study the behavior of water molecules in the permanently shadowed areas on the lunar surface.

[0082] By setting the initial temperature and water molecule concentration of the sample, as well as adjusting the physical and chemical properties of the sample, the desorption behavior of water molecules can be comprehensively examined. In-depth study of the desorption mechanism is of great significance for understanding the formation and evolution of water ice on the lunar surface.

[0083] Implementation method eight. This implementation method is a further limitation of the experimental method for adsorption and desorption of water molecules in the permanent shadow area of ​​the moon described in implementation method one. The migration experiment of T3 time includes: setting the initial temperature gradient of the sample, and simulating the mineral composition, density, and particle size in the deep low temperature vacuum environment cabin.

[0084] Embodiment 9. A computer device proposed in this embodiment includes a memory and a processor, wherein the memory stores a computer program. When the processor runs the computer program stored in the memory, the processor executes an experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon as described in any one of embodiments 1 to 8.

[0085] Embodiment 10. A computer-readable storage medium described in this embodiment has a computer program stored thereon. When the computer program is executed by a processor, the steps of an experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon as described in any one of embodiments 1 to 8 are executed.

[0086] Although preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure. Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

[0087] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit its protection scope. Although the present disclosure has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present disclosure, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the disclosed claims to be approved.

Claims

1. A method for adsorption and desorption of water molecules in the permanent shadow region of the moon, characterized in that: The method comprises: Place the experimental sample array into a deep cryogenic vacuum environment simulation chamber; Construct a deep cryogenic vacuum environment and inject a small amount of water molecules into the experimental sample array; When the environmental conditions meet the experimental requirements, the adsorption experiment begins and lasts for T1 time; After the adsorption experiment, the samples were packaged and transferred; After the encapsulation is completed, the residual water molecules are extracted from the environmental simulation chamber; at the same time, the sample temperature in the desorption sample area and the migration sample area is adjusted to meet the experimental conditions; Conduct a desorption experiment for T2 time, and after the desorption experiment is completed, encapsulate and transfer the desorption experiment samples; A migration experiment was conducted for T3 time, and after the migration experiment was completed, the samples were packaged and transferred.

2. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: The number of experimental sample arrays is 16.

3. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: The sample array is divided into an adsorption zone and a desorption zone by a sample spacing zone, and samples in each zone are evenly arranged on the sample stage; samples in the adsorption zone are used to adsorb ejected water molecules, and samples in the desorption zone are used for desorption experiments of water molecules at different temperatures.

4. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: The deep low temperature vacuum environment is constructed by a vacuum pump and a refrigerator cold head.

5. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: The concentration of micro-quantitative water molecules injected into the experimental sample array is 1.3x10 -9 g / cm 3 ~4.8x10 -6 g / cm 3 .

6. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: When the environmental conditions meet the experimental requirements, the adsorption experiment begins and lasts for T1 time, including: The mass of water molecules adsorbed by the sample is characterized by the modified Hertz-Knudsen equation: Where A is the surface area of ​​the sample in m 2 ; p is the pressure of water molecules, unit is Pa; T is the temperature of water molecules, unit is K; M is the molar mass of water molecules, unit is kg / mol; R is the gas constant, unit is J / (mol·K); In the experimental chamber, when the water molecule injection from the water molecule sublimation generator and the adsorption of the sample reach a state of equilibrium: The pressure of water molecules in the cabin is: Among them, P sat is the saturated vapor pressure, in Pa; S v is the specific surface area, m 2 / g; a is the sublimation coefficient of water ice.

7. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: The desorption experiment for T2 time includes: setting the initial temperature of the sample, the concentration of water molecules, mineral components, density, and particle size in the deep low temperature vacuum environment simulation chamber.

8. The method for adsorption and desorption of water molecules in the permanent shadow region of the moon according to claim 1, characterized in that: The T3 time migration experiment includes: setting the initial temperature gradient of the sample, and simulating the mineral composition, density, and particle size in the deep low temperature vacuum environment chamber.

9. A computer device, characterized in that: It includes a memory and a processor, wherein the memory stores a computer program. When the processor runs the computer program stored in the memory, the processor executes an experimental method for the adsorption and desorption of water molecules in the permanent shadow area of ​​the moon according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a processor, executes the steps of an experimental method for the adsorption and desorption of water molecules in the permanent shadow region of the moon as described in any one of claims 1 to 8.

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