WO2023087474A1

WO2023087474A1 - Preparation device and method for powder sample

Info

Publication number: WO2023087474A1
Application number: PCT/CN2021/139549
Authority: WO
Inventors: 王彤彤; 刘雪涛; 李子依; 王永康
Original assignee: 深圳晶泰科技有限公司
Priority date: 2021-11-19
Filing date: 2021-12-20
Publication date: 2023-05-25
Also published as: CN114002246A

Abstract

A preparation device and method for a powder sample. The preparation device comprises: a sample bearing stage, which is provided with a pipe (5), a sample groove (6) and a jetting needle hole (7), which are sequentially in communication with each other, wherein a front end of the pipe (5) is provided with a bearing mesh slot (4), the bearing mesh slot (4) is used to accommodate a bearing mesh (10), and the bearing mesh slot (4) is in communication with the pipe (5). By means of adhering a powder sample to the bearing mesh (10) in an air jetting manner, various conditions in the process of powder preparation can be fixed, which improves the reproducibility of the powder preparation method and increases the efficiency of preparing the powder sample, and is suitable for preparing a powder sample for microcrystal electron diffraction testing.

Description

A kind of powder sample preparation device and method

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office on November 19, 2021, with application number 202111401760.X and application title "A device and method for preparing powder samples", the entire contents of which are incorporated by reference in this application.

technical field

The application belongs to the technical field of microcrystal electron diffraction testing, and in particular relates to a powder sample preparation device and method.

Background technique

Microcrystal Electron Diffraction (Microcrystal Electron Diffraction, MicroED) needs to continuously rotate crystal particles with a size of 0.2 to 2 microns at a certain angle under the electron beam in a transmission electron microscope, and collect a series of electron diffraction data at different angles at the same time. Analyze the molecular structure of the crystal. Therefore, the MicroED test needs to uniformly disperse micron or even nanometer-sized crystal particles on a 3.05mm diameter grid, which is composed of a copper (gold) grid at the bottom and a carbon film on the upper layer, and then send the grid into the transmission Microscope for testing. The process of attaching a crystal powder sample to a grid is called sample preparation.

There are usually two methods for the preparation of powder samples. One is the solvent evaporation method. 2-5 mg of powder ground to a particle size of 0.2-2 microns is put into 1-5 ml of poor solvent for ultrasonic dispersion for 20-40 minutes to obtain a well-dispersed Then drop 1 to 3 microliters of the suspension on the grid (disc, about 20 microns thick, about 3 mm in diameter) through a pipette gun, and then dry the solvent at room temperature or vacuum Evaporate, leaving only crystal particles on the grid, thus completing the preparation of a sample.

Another type of method is to directly stick the powder ground to a particle size of 0.2 to 2 microns on the carrier net through a variety of different operating modes. One operation is to use tweezers to clamp the edge of the grid to directly pick up the ground powder, so that the crystal particles are attached to the carbon film of the grid, and then gently tap the tweezers to remove the excess crystal particles, thus completing a sample preparation. Another operation is to put the carrier net into a small centrifuge tube containing about 2 mg of powder, shake the centrifuge tube gently to make the powder stick to the carrier net, then use tweezers to clamp the carrier net, and blow off the excess powder with the ear washing ball. Complete sample preparation.

Although the solvent evaporation method can disperse moisture-absorbing and easily agglomerated powders in the air, it takes more time, more than one day, and the method is slightly complicated and the efficiency is low. Therefore, it is more suitable for the preparation of special easily agglomerated powders, but not suitable for the sample preparation of conventional powders.

In the second type of method, no matter whether you use tweezers to clamp the grid to directly pick up the powder, or put the grid into the powder for shaking, the repeatability is poor, the quality of the prepared grid sample is unstable, and larger particles are prone to agglomeration The body is attached to the carbon film and it is difficult to remove it by tapping the tweezers or blowing the ear ball, or the attached particles are too dense. In addition, the strength of the hand is not well controlled, and it is easy to scratch the fragile carbon film in the powder. All of the above situations lead to the failure of sample preparation.

technical problem

The technical problem to be solved in this application is to provide a powder sample preparation device and method in order to solve the technical problem of poor repeatability of the powder sample preparation method in the prior art.

technical solution

The first aspect of the present application provides a powder sample preparation device, comprising:

The sample carrying platform is provided with successively connected pipelines, sample tanks, and air jet pinholes;

The front end of the pipeline is provided with a net-carrying tank for accommodating the net-carrying tank, and the net-carrying tank communicates with the pipeline.

A second aspect of the present application provides a powder sample preparation method, comprising the following steps:

Install the grid into the grid tank of the powder sample preparation device as described above, and place the carbon film side of the grid for attaching particles to the direction of the pipeline;

Place the powder sample in the sample holder;

The gas is injected into the sample slot through the gas injection needle hole by the gas injection device, and the carrier grid with the powder sample attached is obtained.

Beneficial effect

According to the powder sample preparation device and method of the present application, the powder sample is attached to the carrier net by means of air jet, which can fix various conditions in the powder sample preparation process, improve the repeatability of the powder preparation method, and prepare the powder sample. High efficiency, especially suitable for preparing powder samples for microcrystalline electron diffraction test.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Description of drawings

The above and other objects, features and advantages of the present application will become more apparent by describing the exemplary embodiments of the present application in more detail with reference to the accompanying drawings, wherein, in the exemplary embodiments of the present application, the same reference numerals generally represent same parts.

Figure 1 is a schematic diagram of the overall structure of a powder sample preparation device for microcrystal electron diffraction testing in some embodiments of the present application;

2 is a schematic diagram of the exploded structure of a powder sample preparation device for microcrystal electron diffraction testing in some embodiments of the present application;

Fig. 3 is a schematic diagram of the structure of a sample tank of a powder sample preparation device for microcrystal electron diffraction testing in some embodiments of the present application;

Fig. 4 is a schematic structural diagram of a sample carrying platform of a powder sample preparation device for microcrystal electron diffraction testing in some embodiments of the present application.

The reference signs in the figure are:

1 buckle

2 handles

3 Loading grid slot cover

4 Network slots

5 pipes

6 sample slots

61 Scale mark

7 jet pinhole

8 screws

9 base

10 load net.

Embodiments of the present invention

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of this application to those skilled in the art.

The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first", "second", "third" and so on may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present application, first information may also be called second information, and similarly, second information may also be called first information. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and embodiments.

In order to solve the problems in the prior art, the application provides a powder sample preparation device, including:

The sample carrying platform is provided with successively connected pipelines, sample tanks and air injection pinholes;

It should be noted that the sample tank is used to accommodate powder samples; the size and shape of the grid tank is adapted to the grid for fixing and accommodating the grid; the powder sample preparation device can be connected to the The jetting equipment is docked; the jetting equipment injects gas into the sample tank of the powder sample preparation device through the jetting pinhole, and then drives the powder sample on the sample tank to spray on the grid on the grid tank along the pipeline, thereby completing the preparation of the powder sample. That is, the powder sample preparation device in this embodiment can take various conditions in the powder sample preparation process (including but not limited to the amount of powder sample, the amount of injected gas, the speed of injected gas, the carrier grid, the powder sample placed on the sample tank, The mutual distance between the three air-jet pinholes, etc.) is fixed, which improves the repeatability of the powder preparation method, and the efficiency of preparing powder samples is high, and is especially suitable for preparing powder samples for microcrystalline electron diffraction tests.

In order to facilitate the loading and placing of the grid, in an embodiment of the present application, the powder sample preparation device further includes a grid tank cover for fixing the grid.

For the position of the grid-carrying tank, the present application has various implementation schemes.

In one embodiment, the net-carrying tank is arranged on the net-carrying tank cover, that is, in the net-carrying tank cover or the end face of the net-carrying tank cover (the net-carrying tank is composed of the end face of the net-carrying tank cover where it is located and the end face of the sample carrying platform. enclosed). When the net-carrying tank is arranged in the net-carrying tank cover, the net-carrying tank communicates with the pipeline through the first hole. The first hole is preferably arranged in the cover of the grid tank. More preferably, the first hole and the pipe are cylindrical pipes; the central axis of the first hole and the pipe is on or close to the same line as the center/center of the grid placed behind the grid tank, so that the air Flow, the powder sample can be more evenly distributed on the grid under the drive of the gas injected into the pipeline, thereby improving the quality of the sample attached to the grid for testing.

In another embodiment, the grid-carrying trough is set on the connecting portion between the grid-carrying trough cover and the pipeline, that is, in the connecting portion or on the end face of the connecting portion; preferably, the grid-carrying trough is set The end face of the connecting part between the described net-carrying tank cover and the pipeline is enclosed by the end face of the described net-carrying tank cover and the end face of the connecting part (see Figure 2), and the connecting part is provided with A second hole communicated with the grid tank, the second hole communicated with the pipeline. More preferably, the second tunnel and the pipeline are cylindrical pipelines; the central axis of the second tunnel and the pipeline is positioned at or nearly on the same straight line as the center/center of the grid placed behind the grid tank, so that the air Flow, the powder sample can be more evenly distributed on the grid under the drive of the gas injected into the pipeline, thereby improving the quality of the sample attached to the grid for testing.

In another embodiment, the grid tank is surrounded by the end face of the grid tank cover and the sample carrier platform, that is, the end face of the grid tank cover and the sample carrier platform The end face is provided with grooves that cooperate with each other to form a grid-carrying groove.

In another embodiment, the grid-carrying tank is arranged on the sample carrier platform, and the grid-carrying tank, the pipeline, the sample tank, and the air injection pinhole are sequentially connected.

In the above two embodiments, preferably, the pipeline is a cylindrical pipeline, and the central axis of the pipeline and the center/center of the grid placed behind the grid tank are on or close to the same straight line, so as to facilitate air flow, The powder sample can be more evenly distributed on the carrier grid driven by the gas injected into the pipeline.

The grid-carrying tank is a groove, in order to make the grid-carrying grid can be placed on the grid-carrying tank more easily, it is convenient to assemble, and the shaking in the sample preparation process is reduced as much as possible, thereby improving the amount of material attached to the grid-carrying net for testing. The quality of the sample can be specially set for the grid tank. For example:

In an embodiment of the present application, the depth of the grid-carrying tank is adapted to the thickness of the grid-carrying tank, so as to minimize possible displacement after the grid-carrying tank is placed on the grid-carrying tank. For example the same, or substantially the same/approximately the same.

In another embodiment of the present application, the bottom edge/bottom surface in contact with the grid in the grid tank has an angle of a with the horizontal plane, 0<a<90°; more preferably, 30°<a< 90° or 45°<a<75°.

In another embodiment of the present application, the part for accommodating the net in the net-carrying tank is in the shape of a slanted column or a truncated truss, preferably in the shape of a slanted cylindrical, truncated circular or rhomboidal column. When it is oblique cylindrical, the diameter of said oblique cylinder is slightly larger than that of the loading net; The face of the frustum closer to the pipe has a larger diameter.

In another embodiment of the present application, the center/center of the grid placed behind the grid tank coincides or almost coincides with the central axis of the gas outlet of the pipeline.

The above-mentioned several embodiments can make the loading net can be placed on the loading grid slot more easily, ensure the repeatability of the sample used for testing on the loading grid prepared based on the device, and improve the sample size attached to the loading grid for testing. the quality of the sample.

It should be noted that, considering that the thickness of the carrying net is very thin (about 20 microns), the bottom edge/bottom surface in contact with the carrying net in the carrying net tank is arranged to have a certain angle with the horizontal plane, which can reduce the manufacturing cost of this application. The difficulty and cost of the installation.

In an embodiment of the present application, the depth of the grid-carrying tank is adapted to the thickness of the clamping device for clamping the grid-carrying tank, so as to minimize possible displacement of the clamping device after it is placed on the grid-carrying tank . For example, the same, or basically the same/approximately the same, the clamping device for clamping the grid is used to clamp the grid, and can expose the carbon film on the grid.

In one embodiment of the present application, the sample groove is a groove; preferably, the surface carrying the powder sample on the groove is an arc surface, more preferably an arc surface; so that the powder sample in the sample groove can More evenly is blown and evenly distributed on the grid.

In an embodiment of the present application, there are scale marks on the surface or side of the sample tank.

It should be noted that when preparing the powder sample for microcrystal electron diffraction test, because the required powder sample amount is very small (in mg, such as 2mg), and the amount of powder sample added is for the final preparation obtained for The sample on the grid under test is highly influential. Based on the scale marks, the user can more conveniently control the amount of powder sample to be added, thereby improving the quality of the test sample attached to the grid.

The scale mark can only mark a certain part of the sample tank, such as the middle part, or can mark the entire sample tank (see Figure 3), which is convenient for the user to adjust the powder sample to be placed in the sample tank in combination with conditions such as the gas injected into the sample tank. The position and amount of the sample are recorded and recorded, thereby improving the quality of the sample attached to the grid for testing.

In an embodiment of the present application, the upper part of the sample tank is provided with an openable sample tank cover, which is used to close the open space on the upper part of the sample tank. When the user uses the device of the present application for powder sample preparation, the The cover of the sample tank is closed to isolate the sample tank from the outside air, avoiding the problem of mutual pollution/influence between different experiments caused by the powder sample being lifted up and floating in the experimental environment.

In another embodiment of the present application, the powder sample preparation device further includes a base, and the base is arranged at the bottom of the sample carrying platform. Preferably, screw holes are provided around the sample carrier, and the base is connected to the sample carrier by screws.

In another embodiment of the present application, the powder sample preparation device further includes an outer cover, the outer cover is used to cover the sample carrier platform and the base, and the outer cover is provided with an opening, which is convenient for the air outlet end of the air injection device to connect with the air injection needle. The communication between the holes; the outer cover is provided with an opening and closing device, which is convenient for adding samples to the sample tank and/or replacing the grid.

The application also provides a powder sample preparation method, comprising the following steps:

Place the powder sample in the sample holder;

The powder sample preparation method based on the aforementioned powder sample preparation device is simple and efficient, and the prepared test samples on the carrier net have good repeatability.

In an embodiment of the present application, the air spraying equipment includes an air compression pump and a spray gun, the air inlet of the spray gun communicates with the air outlet of the air compression pump, the air outlet of the spray gun communicates with the intake end of the communication device, and the communication The air outlet of the device is connected with the air injection pinhole; during sample preparation, a fixed flow rate of air is injected into the sample tank through the communication device through the spray gun, and the powder sample is sprayed on the carrier net along the pipeline.

It should be noted that the communication device in this embodiment is not particularly limited, and preferably includes a cylindrical inner cavity, so that the gas can pass through evenly and enter the sample tank. In some embodiments, the communication device is a microsampler with the piston removed.

Example 1

This embodiment provides a powder sample preparation device for microcrystal electron diffraction testing, as shown in Figures 1 and 2, including:

The sample carrying platform is provided with a sample tank 6 for accommodating powder samples, and is also provided with an air jet pinhole 7 and a pipeline 5; the air jet pinhole 7 is arranged at the rear end of the sample tank 6 for docking with an air jet device, so Said pipeline 5 is arranged on the front end of said sample tank 6, and is used for docking carrying net 10; Pipeline 5 is a cylindrical pipeline; Air jet pinhole 7 is a circular hole;

The front end of the sample tank 6 is provided with a grid tank 4 for accommodating the grid 10 , and the grid tank 4 communicates with the pipeline 5 . The grid tank 4 includes a cylindrical shape (the part where the grid 10 is placed) and a rectangular parallelepiped (to facilitate the loading and unloading of the grid 10 ).

Preferably, the powder sample preparation device for microcrystalline electron diffraction test of this embodiment, as shown in Figures 1 and 2, also includes a grid tank cover 3 installed on the front end of the sample carrier, and the grid A grid-carrying tank 4 is provided at the connection between the tank cover 3 and the sample carrier; the end surface of the connecting part is provided with a groove to form the grid-carrying tank 4 . By arranging the detachable net-carrying tank cover 3, the depth of the net-carrying tank 4 can be set to be approximately the same as the thickness of the net-carrying tank 10, so that the net-carrying tank 10 is not easy to shake after the net-carrying tank cover 3 is fixed, and the attachment to the carrier net can be improved. The quality of the samples available online for testing.

Preferably, the powder sample preparation device for microcrystalline electron diffraction test of this embodiment, as shown in Figures 1 and 2 , the mesh tank cover 3 and the sample carrier are connected and fixed by buckles 1 . The buckle 1 is convenient for the disassembly and assembly of the net tank cover 3 .

Preferably, the powder sample preparation device for microcrystal electron diffraction test of this embodiment, as shown in Figures 1 and 2, the front end of the grid tank cover 3 is provided with a handle 2 for holding. The handle 2 is convenient for holding the net tank cover 3 and is convenient for installation.

Preferably, the powder sample preparation device for microcrystal electron diffraction test of this embodiment, as shown in Figures 1 and 2, further includes a base 9, and the base 9 is arranged at the bottom of the sample carrying platform. The base 9 is convenient to raise the sample carrier platform so that the operator can use it. In this embodiment, the base 9 is designed as an I-shape.

Preferably, the powder sample preparation device for microcrystal electron diffraction test of this embodiment, as shown in Figures 1 and 2, is provided with screw holes around the sample carrier, and the base 9 is connected to the sample carrier. Attached by screw 8.

Preferably, the powder sample preparation device for microcrystalline electron diffraction test of this embodiment, as shown in Figures 1-3, the sample tank 6 is a groove with an open top; preferably, the groove carries powder The surface of the sample is an arc surface, more preferably an arc surface; so that the powder sample in the sample tank can be blown more evenly and evenly distributed on the grid.

Preferably, as shown in FIG. 3 , the surface of the sample chamber 6 is engraved with a scale mark 61 in the powder sample preparation device for microcrystal electron diffraction test in this embodiment. Since the amount of sample particles attached to the grid is greatly affected by the static electricity of the powder, the optimal strategy is to place the powder in the sample tank each time without knowing the static electricity of the powder and without performing a test experiment. Use as little powder as possible (about 1 mg), observe the particle distribution on the carrier net after spraying once, and decide whether to re-spray according to the particle distribution. In order to control the amount of powder placed each time, scale markings with an interval of 1 mm, 2 mm or other units can be set on the sample slot with a total length of 20 mm, for example. In some embodiments, when placing the powder sample, it is better to make a small pile of powder no more than one division scale. It should be noted that, the closer the powder sample is to the jet needle, the more powder sample will be lifted into the surrounding air, and the amount of powder reaching the loading net will be relatively less; the closer the powder sample is to the loading grid tank, the The more powder particles attached to the net. When the static electricity of the powder is not known, the optimal strategy is to place the powder in the middle of the sample tank as much as possible, as shown in Figure 3.

In order to prevent the sample powder from blowing up in the air in a large area when the spray gun blows air, the device of this embodiment is also provided with an outer cover (acrylic cover) to cover the sample carrier platform and the base 9 . The outer cover is provided with an opening for connecting the front end (needle) of the micro-sampler to the air jet pinhole, and the top of the outer cover can also be provided with a flip door to facilitate the loading and unloading of the carrier net.

This embodiment provides a powder sample preparation method for microcrystal electron diffraction test, using the above-mentioned powder sample preparation device for microcrystal electron diffraction test in this embodiment, including the following steps:

As shown in Figures 1 and 2, the upper part of the preparation device is the part for placing the grid and powder samples, and the lower part is the base. Firstly, the side of the carbon film used for attaching particles on the carrier net faces the direction of the pipeline 5 , and snaps it into the grid tank 4 between the pipeline 5 and the grid tank cover 3 . The aperture on the net-carrying tank cover 3 is the buckle that the net-carrying tank cover is fixed on the device. Then, place about 1 mg of the ground powder sample in the middle of the sample tank 6 with a spatula.

Prepare an air compression pump, connect the air inlet of a spray gun through a rubber air tube with an outer diameter of 6mm at the air outlet, connect the air outlet of the spray gun to a micro sampler with the piston removed through the rubber tube, and insert the needle of the micro sampler into the Pass the air jet pinhole 7 and fix it.

When preparing samples, first turn on the switch of the air compression pump, and the air compression pump starts to work; then press the switch of the spray gun once, and the needle of the micro-sampler sprays compressed air with a fixed flow rate once, and the air flow passes through the sample tank 6 to drive the powder sample Spray on the grid in the grid tank 4 along the pipeline 5, thus completing a sample preparation.

Example 2

This embodiment provides a powder sample preparation device for microcrystalline electron diffraction test, as shown in Figure 4, the difference from the sample carrier structure of the preparation device in Example 1 is as follows: there is no grid tank cover 3, and The front end of the sample carrying platform is directly provided with a semi-open net-carrying tank 4 , the net-carrying tank 4 is semi-cylindrical, and the net-carrying tank 10 is vertically placed in the net-carrying tank 4 . The advantage of this fixing method is that the placement and replacement of the carrier grid does not need to open the cover, which is more convenient.

Having described various embodiments of the present application above, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principle of each embodiment, practical application or improvement of technology in the market, or to enable other ordinary skilled in the art to understand each embodiment disclosed herein.

Claims

A powder sample preparation device, characterized in that it comprises:

The sample carrying platform is provided with a pipeline (5), a sample tank (6) and an air injection pinhole (7) connected in sequence;

The front end of the pipeline (5) is provided with a grid-carrying tank (4), the grid-carrying tank (4) is used to accommodate the grid-carrying tank (10), and the grid-carrying tank (4) communicates with the pipeline (5) .
The powder sample preparation device according to claim 1, characterized in that, it also includes a grid tank cover (3) for fixing the grid, and the grid tank (4) is arranged on the grid tank cover (3) ), on the connecting portion between the grid tank cover (3) and the pipeline (5), or surrounded by the end face of the grid tank cover (3) and the end face of the sample carrier become.
The powder sample preparation device according to claim 2, characterized in that, the grid-carrying tank (4) is arranged on the end face of the connecting portion between the grid-carrying tank cover (3) and the pipeline (5), It is formed by enclosing the end face of the net carrying tank cover (3) and the end face of the connecting part, the connecting part is provided with a second channel communicating with the carrying net tank (4), and the second channel is connected with the pipeline (5) connected.
The powder sample preparation device according to claim 3, characterized in that, the grid tank (4) includes a cylindrical shape and a rectangular parallelepiped shape.
The powder sample preparation device according to claim 2, characterized in that, the mesh-carrying tank cover (3) is connected and fixed by a buckle (1) to the sample carrier table; the net-carrying tank cover (3) ) is provided with a handle (2) for holding; the sample tank (6) is a groove, and the surface of the groove carrying the powder sample is an arc surface.
The powder sample preparation device according to claim 5, characterized in that, the surface of the groove carrying the powder sample is an arc surface.
The powder sample preparation device according to claim 1, characterized in that, the grid-carrying tank (4) is arranged on the sample carrier platform, and the grid-carrying tank (4), pipeline (5), sample tank ( 6), the jet pinholes (7) are connected successively.
The powder sample preparation device according to claim 1, characterized in that, the depth of the grid-carrying tank (4) is adapted to the thickness of the grid-carrying tank (10); 10) The bottom edge or bottom surface in contact, the angle with the horizontal plane is a, 0<a<90°; the part used to accommodate the carrying net (10) in the carrying net groove (4) is inclined columnar or inclined platform ; The center/center of the grid (10) placed behind the grid tank (4) coincides or almost coincides with the central axis of the gas outlet of the pipeline (5).
The powder sample preparation device according to claim 1 or 5, characterized in that there are scale marks (61) on the surface or side of the sample tank (6).
The powder sample preparation device according to claim 1, characterized in that, the top of the sample tank (6) is provided with a sample tank cover that can be opened and closed; it also includes a base (9), and the base (9) is arranged on The bottom of the sample carrier; screw holes are provided around the sample carrier, and the base (9) is connected to the sample carrier by screws (8).
The powder sample preparation device according to claim 10, characterized in that the base (9) is I-shaped.
The powder sample preparation device according to claim 10, further comprising: an outer cover, the outer cover covers the sample carrier platform and the base (9), and the outer cover is provided with a needle for a micro-sampler The opening that connects to the jet pinhole.
The powder sample preparation device according to claim 12, wherein the outer cover is also provided with a flip door.
A powder sample preparation method is characterized in that, comprising the following steps:

The carrier net (10) is installed in the carrier net tank (4) of the powder sample preparation device as claimed in claim 1, and the carbon film side for attaching particles on the carrier net is facing the pipeline (5) direction;

The powder sample is placed in the sample tank (6);

The gas is injected into the sample groove (6) through the gas injection needle hole (7) by the gas injection device, so as to obtain the carrier net with the powder sample attached.
The powder sample preparation method according to claim 14, characterized in that, the air injection device comprises an air compression pump and a spray gun, the air inlet of the spray gun communicates with the air outlet of the air compression pump, and the air outlet of the spray gun communicates with the inlet of the communication device. The gas end is communicated, and the gas outlet end of the communication device is communicated with the air injection pinhole (7); during sample preparation, the air with a fixed flow rate is injected into the sample tank (6) through the communication device through the spray gun and drives the powder sample along the pipeline (5 ) sprayed on the grid.