SEM (scanning electron microscope) test sample preparation and demagnetization integrated device for carbon nanotube powder

Abstract

The utility model discloses an SEM (scanning electron microscope) test sample preparation and demagnetization integrated device for carbon nanotube powder. The number of the rolling platforms is two, the cross section structures of the two rolling platforms are both set to be in an L shape, the two rolling platforms are symmetrically arranged, and a driving sliding table and a driven sliding table are slidably installed on the two rolling platforms correspondingly; and one end of the demagnetizing roller is rotatably mounted on the driven sliding table. According to the device disclosed by the utility model, the demagnetizing roller can slide on the rolling platform through the driving mechanism and is driven to roll on the sample table at a constant speed, in the rolling process, the magnetic bar attracts magnetic impurities in the powder sample, the impurities and the powder sample which is not firmly attached are adsorbed to the surface of sticky roll paper, and meanwhile, the demagnetizing roller is driven to roll on the sample table at a constant speed. A thin layer of firmly attached sample is reserved on the conductive adhesive, so that synchronous operation of sample preparation and demagnetization is completed, sample accumulation is reduced, magnetic substances are removed, the functions of sample preparation and demagnetization are integrated, and the operation is simple, convenient and efficient.

Description

An integrated device for SEM testing, sample preparation, and demagnetization of carbon nanotube powder Technical Field

[0001] This utility model specifically relates to the field of carbon nanotube powder SEM testing sample preparation technology, and specifically to an integrated device for carbon nanotube powder SEM testing sample preparation and demagnetization. Background Technology

[0002] The following technical problems exist in the current process of preparing samples for SEM testing of carbon nanotube powder:

[0003] 1. Sample accumulation and contamination issues: Existing carbon nanotube SEM testing sample preparation methods are difficult to effectively control sample thickness, which easily leads to sample accumulation and poor adhesion of the upper sample. During vacuuming and testing, loose sample particles are easy to fall off, contaminating the electron microscope chamber, affecting the testing environment and increasing maintenance costs.

[0004] 2. Magnetic impurity interference and detector contamination: Magnetic impurity particles that may exist in carbon nanotubes can interfere with SEM imaging, leading to problems such as image distortion and reduced resolution. More importantly, these magnetic impurity particles are easily adsorbed by the detector during the testing process, causing detector contamination, affecting its service life and testing accuracy, and even causing damage to expensive detectors.

[0005] 3. Separation of sample preparation and demagnetization: In existing technologies, sample preparation and demagnetization are usually two separate steps, which are cumbersome and inefficient.

[0006] When using scanning electron microscopy to observe and analyze the microstructure of powder samples, high-quality sample preparation and effective demagnetization are key prerequisites for obtaining clear and accurate images. Currently, sample preparation and demagnetization are usually performed separately, which is not only cumbersome but also prone to introducing impurities or damaging the sample during the process. Furthermore, existing demagnetization methods, such as traditional magnetic separation, suffer from incomplete demagnetization and poor removal of tiny magnetic particles. In addition, uneven sample dispersion and poor adhesion to the sample stage often occur during sample preparation, which seriously affect the accuracy and reliability of SEM detection results.

[0007] To address the above issues, Chinese utility model patent CN206248412U discloses a powder sample preparation device for scanning electron microscope. This device incorporates vibration and air blowing. Vibration causes the sample to be scattered onto the sample stage below, while excess sample is blown up by the air blowing device and then removed by the air extraction device. However, carbon nanotubes have low density and small size, making them prone to scattering with even slight airflow fluctuations. Vibration also makes them susceptible to scattering, thus this method is unsuitable.

[0008] Chinese invention patent CN119000755A discloses a pretreatment method for magnetic powder samples for scanning electron microscopy. This method disperses magnetic powder in a dispersant to form a suspension, immerses a sheet-like carrier in the suspension, and then uses the sheet-like carrier to dry, fix, and transfer the dispersed magnetic powder loaded on it. After being embedded and fixed in conductive resin, the sample is demagnetized to achieve pretreatment. However, since carbon nanotubes are nanomaterials, the resin embedding can easily become too thick, or the carbon nanotubes may become trapped in the conductive resin. When performing scanning electron microscopy, the morphology of the carbon nanotubes will be obscured, and only the morphology of the conductive resin coating on the surface will be seen. Therefore, the demagnetization is still incomplete. Summary of the Invention

[0009] Therefore, this utility model proposes an integrated device for SEM testing and sample preparation and demagnetization of carbon nanotube powder to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: an integrated device for SEM testing and sample preparation and demagnetization of carbon nanotube powder, comprising:

[0011] Base plate;

[0012] There are two roller pressing platforms, both of which have an L-shaped cross-section and are symmetrically arranged. Each of the two roller pressing platforms has a sliding active slide and a driven slide.

[0013] The demagnetizing roller has one end rotatably mounted on the driven slide, and the other end of the demagnetizing roller is driven to rotate by a drive mechanism mounted in the active slide.

[0014] And sample stages, which are provided in multiples and are arranged at equal intervals below the demagnetizing roller, and each of the sample stages and the roller pressing platform is mounted on the base plate by a height adjustment component;

[0015] The demagnetizing roller consists of a strong magnetic rod, a hollow roller, and a flexible collar wrapped with adhesive paper. The strong magnetic rod is fixed in the middle of the inner cavity of the hollow roller, and the flexible collar is sleeved on the side wall of the hollow roller within the length range of the strong magnetic rod.

[0016] Furthermore, as a preferred embodiment, the flexible collar is made of sponge material, and the thickness of the flexible collar is greater than 5mm.

[0017] Furthermore, as a preferred embodiment, each of the roller pressing platforms is provided with a slide groove, and a slide rail is fixed on the inner bottom surface of the slide groove. A slider is matched and slidably connected on each slide rail, and two sliders are respectively fixed on the active slide table and the driven slide table.

[0018] Furthermore, as a preferred embodiment, a screw is fixed in the groove where the active slide is located, and the screw passes through the active slide, and the screw is threadedly connected to a bevel gear with internal threads.

[0019] Furthermore, preferably, the drive mechanism includes:

[0020] The second rotating shaft is longitudinally arranged in the inner cavity of the active slide, and the second rotating shaft is driven by a forward and reverse motor fixed on the top surface of the active slide.

[0021] A rotating shaft is installed in a bearing that is laterally positioned within the active slide table. One end of the rotating shaft is fixedly connected to a hollow roller, and a bevel gear is fixedly installed at the other end of the rotating shaft.

[0022] A fourth bevel gear is fixedly mounted on the second rotating shaft, and the fourth bevel gear meshes with the first bevel gear for transmission.

[0023] And a bevel gear three, which is fixedly mounted on the rotating shaft two and located below the bevel gear four, the bevel gear three meshing with the bevel gear two for transmission.

[0024] Furthermore, preferably, the height adjustment component includes:

[0025] The support cylinder has threads on its inner wall;

[0026] An adjusting stud has one end threadedly connected to the support cylinder;

[0027] A connecting block, which is fixedly connected to the other end of the adjusting stud;

[0028] And a locking bolt, which is threaded into a threaded hole on the side of the support cylinder, and the locking bolt can tighten and fix the adjusting stud.

[0029] Furthermore, preferably, the length of the roller pressing platform is the same as that of the base plate.

[0030] This utility model adopts the above technology and has the following beneficial effects compared with the existing technology:

[0031] In this device, the demagnetizing roller can slide on the roller pressing platform via a driving mechanism, and is driven to roll at a uniform speed on the sample stage. During the rolling process, the magnetic rod attracts magnetic impurities in the powder sample, and the impurities are adsorbed onto the surface of the sponge and adhesive paper roll. At the same time, the powder sample is coated and fixed on the adhesive paper roll, thereby completing the sample preparation and demagnetization operations simultaneously, reducing sample accumulation, removing magnetic substances, integrating sample preparation and demagnetization functions, and being simple and efficient to operate. Attached Figure Description

[0032] Figure 1 is a schematic diagram of an integrated device for SEM testing and demagnetization of carbon nanotube powder.

[0033] Figure 2 is a schematic diagram of the internal structure of the active slide in an integrated device for SEM testing and demagnetization of carbon nanotube powder.

[0034] Figure 3 is a cross-sectional view of the demagnetizing roller in an integrated device for SEM testing and demagnetization of carbon nanotube powder.

[0035] Figure 4 is a schematic diagram of the height adjustment component in an integrated device for SEM testing and demagnetization of carbon nanotube powder.

[0036] In the diagram: 1. Active slide; 2. Demagnetizing roller; 3. Roller pressing platform; 4. Sample stage; 5. Height adjustment assembly; 6. Base plate; 7. Driven slide; 21. Adhesive roll paper; 22. Strong magnetic rod; 23. Hollow roller; 24. Flexible collar; 51. Connecting block; 52. Support cylinder; 53. Locking bolt; 54. Adjusting stud; 101. Forward and reverse motor; 102. Bevel gear one; 103. Bearing; 104. Shaft one; 106. Slider; 107. Screw; 108. Slide rail; 109. Bevel gear two; 110. Bevel gear three; 111. Bevel gear four; 112. Shaft two. Detailed Implementation

[0037] With reference to the accompanying drawings of the embodiments of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below.

[0038] Example: Please refer to Figures 1-4. This utility model provides a technical solution: an integrated device for SEM testing and sample preparation and demagnetization of carbon nanotube powder, comprising:

[0039] Base plate 6;

[0040] There are two roller pressing platforms 3. The cross-sectional structure of both roller pressing platforms 3 is L-shaped and they are symmetrically arranged. The active slide 1 and the driven slide 7 are slidably installed on the two roller pressing platforms 3 respectively.

[0041] The demagnetizing roller 2 has one end rotatably mounted on the driven slide 7, and the other end of the demagnetizing roller 2 is driven to rotate by a drive mechanism installed in the active slide 1.

[0042] And sample stages 4, which are provided in multiples and are arranged at equal intervals below the demagnetizing roller 2, and each sample stage 4 and the roller pressing platform 3 are mounted on the base plate 6 by a height adjustment component 5.

[0043] Specifically, conductive adhesive is applied to the surface of the sample stage;

[0044] The demagnetizing roller 2 consists of a strong magnetic rod 22, a hollow roller 23, and a flexible collar 24 with an outer layer of adhesive paper roll 21. The strong magnetic rod 22 is fixed in the middle of the inner cavity of the hollow roller 23, and the flexible collar 24 is sleeved on the side wall of the hollow roller 23 within the length range of the strong magnetic rod 22.

[0045] In this embodiment, the flexible collar 24 is made of sponge material, and the thickness of the flexible collar 24 is greater than 5mm.

[0046] In this embodiment, each roller pressing platform 3 is provided with a sliding groove, and a slide rail 108 is fixed on the inner bottom surface of the sliding groove. Each slide rail 108 is matched with a slider 106, and the two sliders 106 are respectively fixed on the active slide table 1 and the driven slide table 7.

[0047] In this embodiment, a screw 107 is fixed in the groove where the active slide 1 is located, and the screw 107 passes through the active slide 1. The screw 107 is threadedly connected to a bevel gear 109 with internal threads.

[0048] In this embodiment, the driving mechanism includes:

[0049] The second rotating shaft 112 is longitudinally arranged in the inner cavity of the active slide 1, and the second rotating shaft 112 is driven by the forward and reverse rotating motor 101 fixed on the top surface of the active slide 1.

[0050] A rotating shaft 104 is installed in a bearing 103 that is horizontally arranged in the active slide table 1. One end of the rotating shaft 104 is fixedly connected to the hollow roller 23, and a bevel gear 102 is fixedly installed on the other end of the rotating shaft 104.

[0051] The bevel gear 411 is fixedly mounted on the rotating shaft 212, and the bevel gear 4111 meshes with the bevel gear 102 for transmission.

[0052] And bevel gear 3 110, which is fixedly mounted on shaft 2 112 and located below bevel gear 4 111, bevel gear 3 110 meshes with bevel gear 2 109 for transmission;

[0053] Specifically, driven by the forward and reverse motors, the active slide table can slide along the slide rail while the demagnetizing roller 2 can rotate at a constant speed.

[0054] In this embodiment, the height adjustment component 5 includes:

[0055] The support cylinder 52 has threads on its inner wall;

[0056] The adjusting stud 54 has one end threadedly connected to the support cylinder 52;

[0057] Connecting block 51, which is fixedly connected to the other end of adjusting stud 54;

[0058] And a locking bolt 53, which is threaded into a threaded hole on the side of the support cylinder 52, and the locking bolt 53 can tighten and fix the adjusting stud 54.

[0059] In this embodiment, the roller pressing platform 3 and the base plate 6 have the same length.

[0060] This utility model also provides a method for using an integrated device for SEM testing and demagnetization of carbon nanotube powder, which includes the following steps:

[0061] Step 1: Spread the powder sample to be processed evenly on the conductive adhesive on the sample stage, and then blow away most of the loosely adhered particles with compressed air.

[0062] Step 2: Adjust the demagnetizing roller 2 to a suitable height using the height adjustment component, so that the distance between the demagnetizing roller 2 and the sample stage meets the requirement that the flexible collar made of sponge can be compressed to 1-3mm;

[0063] Step 3: The demagnetizing roller 2 can slide on the roller pressing platform through the driving mechanism and roll at a uniform speed on the sample stage. During the rolling process, the magnetic rod attracts magnetic impurities in the powder sample. The impurities are adsorbed on the surface of the sponge and adhesive roll paper. At the same time, the powder sample is coated and fixed on the adhesive roll paper. As the demagnetizing roller 2 rolls, it is evenly transferred to the sample stage, completing the sample preparation and demagnetization synchronous operation.

[0064] Step 4: After the demagnetizing roller 2 has finished rolling, a thin, uniformly distributed, and demagnetized powder sample is obtained on the sample stage, which can be directly used for SEM detection.

[0065] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An integrated device for SEM testing, sample preparation, and demagnetization of carbon nanotube powder, characterized in that, It includes: The base plate (6); two roller pressing platforms (3) are provided, both of which have an L-shaped cross-section and are symmetrically arranged. An active slide (1) and a driven slide (7) are slidably mounted on each of the two roller pressing platforms (3); a demagnetizing roller (2), one end of which is rotatably mounted on the driven slide (7), and the other end of which is driven to rotate by a drive mechanism installed in the active slide (1); and multiple sample stages (4) are provided and are equidistantly arranged on the demagnetizing roller (6). Below 2), and each of the sample stages (4) and the roller pressing platform (3) is mounted on the base plate (6) using a height adjustment component (5); wherein, the demagnetizing roller (2) is composed of a strong magnetic rod (22), a hollow roller (23) and a flexible collar (24) wrapped with adhesive roll paper (21) on the outside, the strong magnetic rod (22) is fixed in the middle of the inner cavity of the hollow roller (23), and the flexible collar (24) is sleeved on the side wall of the hollow roller (23) within the length range of the strong magnetic rod (22).

2. The integrated device for SEM testing and demagnetization of carbon nanotube powder according to claim 1, characterized in that: The flexible collar (24) is made of sponge material, and the thickness of the flexible collar (24) is greater than 5mm.

3. The integrated device for SEM testing and demagnetization of carbon nanotube powder according to claim 1, characterized in that: Each of the roller pressing platforms (3) is provided with a sliding groove, and a slide rail (108) is fixed on the inner bottom surface of the sliding groove. Each slide rail (108) is matched with a slider (106), and the two sliders (106) are respectively fixed on the active slide (1) and the driven slide (7).

4. The integrated device for SEM testing and demagnetization of carbon nanotube powder according to claim 3, characterized in that: A screw (107) is fixed in the groove where the active slide (1) is located, and the screw (107) passes through the active slide (1). The screw (107) is threadedly connected to a bevel gear (109) with internal threads.

5. The integrated device for SEM testing and demagnetization of carbon nanotube powder according to claim 4, characterized in that: The driving mechanism includes: a second rotating shaft (112), which is longitudinally arranged in the inner cavity of the active slide (1), and the second rotating shaft (112) is driven by a forward and reverse motor (101) fixed on the top surface of the active slide (1); a first rotating shaft (104), which is installed in a bearing (103) arranged laterally in the active slide (1), one end of the first rotating shaft (104) is fixedly connected to a hollow roller (23), and the other end of the first rotating shaft (104) is fixedly installed with a first bevel gear (102); a fourth bevel gear (111), which is fixedly installed on the second rotating shaft (112), and the fourth bevel gear (111) meshes with the first bevel gear (102); and a third bevel gear (110), which is fixedly installed on the second rotating shaft (112) and located below the fourth bevel gear (111), and the third bevel gear (110) meshes with the second bevel gear (109).

6. The integrated device for SEM testing and demagnetization of carbon nanotube powder according to claim 1, characterized in that: The height adjustment assembly (5) includes: a support cylinder (52) with threads on its inner wall; an adjustment stud (54) with one end threadedly connected to the support cylinder (52); a connecting block (51) fixedly connected to the other end of the adjustment stud (54); and a locking bolt (53) threadedly connected to a threaded hole on the side of the support cylinder (52), and the locking bolt (53) can press and fix the adjustment stud (54).

7. The integrated device for SEM testing and demagnetization of carbon nanotube powder according to claim 1, characterized in that: The roller pressing platform (3) has the same length as the base plate (6).

Images