Gas sampling device suitable for sample preparation of diamond anvil cell press

Abstract

The utility model discloses a gas sampling device suitable for preparing a sample by a diamond anvil cell press. The gas sampling device comprises an upper cushion block, a lower cushion block, a pair of diamond anvil cells, a sample to be tested, a sealing rubber ring and a sealing device, the sealing rubber ring is arranged on the periphery of the upper cushion block and the periphery of the lower cushion block in a surrounding mode, the sealing device fastens the sealing rubber ring and comprises a sealing semi-ring, a gas taking semi-ring, a fastening screw and a fastening nut, the sealing semi-ring and the gas taking semi-ring are clamped on the outer side of the sealing rubber ring, and the fastening screw and the fastening nut are fixedly connected with the sealing device through fixing holes. A gas taking hole is formed in the side face of the gas taking semi-ring and used for enabling a gas taking needle to be inserted into the sealed space through the sealing rubber ring, and gas-phase substances are obtained. According to the utility model, under the condition that the sample amount is extremely small, the dissipation of a gas phase sample can be reduced; and the operation is simple, the disassembly and assembly are convenient, different semi-ring sizes and gas taking needle hole sizes can be customized according to different pressing machines, and the adaptability is high.

Description

Technical Field

[0001] The utility model relates to the field of in-situ measurement of physical quantities under high temperature and high pressure, and in particular to a gas extraction device suitable for preparing samples using a diamond anvil press. Background Art

[0002] The diamond anvil cell press (DAC) experimental technology has been rapidly developed and applied since the 1970s. Its pressure can reach 550 GPa and it is the most important scientific instrument in the field of high-pressure science and technology research.

[0003] After using this specialized device, samples undergo numerous sudden changes in physical and chemical properties that differ from those observed under normal pressure. Detecting these changes has significant implications for the contract preparation of high-performance materials and the development of novel testing methods. However, the sample quantities prepared using a diamond anvil cell press are typically extremely small, often in the microgram or microliter range. This extreme sample size places stringent demands on testing methods, requiring not only accurate measurements but also minimal sample damage. This is particularly true in gas phase testing, where rapid gas escape rates and visual indiscernibility can easily lead to gas leaks.

[0004] Therefore, how to stably obtain the gas phase material of the sample and avoid sample leakage has become a technical problem that needs to be urgently solved in the diamond anvil cell press (DAC) experimental technology. Utility Model Content

[0005] The utility model aims to provide a gas extraction device suitable for preparing samples in a diamond anvil press, which has the advantages of simple operation, easy assembly and disassembly, and strong adaptability.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A gas extraction device suitable for preparing samples in a diamond anvil press comprises a pair of upper and lower pads of a diamond anvil press (DAC), a pair of diamond anvils, a sample to be tested, a sealing rubber ring and a sealing device;

[0008] The pads are opposed to each other up and down, with a pair of diamond anvils in the middle, and the sample to be tested is placed in the middle of the pair of diamond anvils.

[0009] The sealing rubber ring is arranged around the outer circumference of the upper and lower pads, and the sealing device tightens the sealing rubber ring to form a complete sealed space between the pad, the anvil and the sample to be tested. An air extraction hole is provided on the side of the sealing device to allow the air extraction needle to be inserted into the sealed space through the sealing rubber ring to obtain gaseous substances.

[0010] Optionally, the sealing device includes a sealing half ring, an air extraction half ring, a fastening screw, and a fastening nut. The outer sides of the sealing half ring and the air extraction half ring have fixing holes. The sealing half ring and the air extraction half ring are clamped on the outer side of the sealing rubber ring to fix the sealing rubber ring. The fastening screw and the fastening nut are connected and fixed through the fixing holes to fix the sealing device. The air extraction hole is provided on the side of the air extraction half ring.

[0011] Optionally, the position of the air extraction hole is customized according to the size of the air extraction needle.

[0012] Optionally, the sealing rubber ring includes two half rings.

[0013] Optionally, the sealing rubber ring is made of silicone rubber.

[0014] Optionally, the sealing device is made of stainless steel or titanium alloy.

[0015] Therefore, the utility model uses a sealing rubber ring and a sealing device to construct a sealed space between the upper and lower pads, the upper and lower anvils, and the sample to be tested, which only allows the gas extraction needle to pass through. It has the following advantages:

[0016] 1. It avoids the possibility of leakage of samples after they are exposed once the press is opened and cannot be tested. It can reduce the leakage of gas phase samples when the sample amount is extremely small, so as to facilitate subsequent gas chromatography detection.

[0017] 2. The gas extraction device is simple to operate and easy to assemble and disassemble. It can customize different half-ring sizes and gas extraction pinhole sizes according to different presses. It has strong adaptability and is particularly suitable for specific test experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional exploded view of the air extraction device according to a specific embodiment of the utility model;

[0019] Figure 2 is a cross-sectional view of an air extraction device according to a specific embodiment of the utility model;

[0020] Figure 3 is a top view of a sealing device according to a specific embodiment of the present utility model;

[0021] Figure 4 It is a three-dimensional diagram of an air extraction device according to a specific embodiment of the present utility model.

[0022] The technical features indicated by the reference numerals in the figures are:

[0023] 1. Sealing half ring; 2. Air extraction half ring; 3. Fastening screws; 4. Fastening nuts; 5. Spacers; 6. Diamond anvil; 7. Test sample; 8. Sealing rubber ring; 9. Air extraction hole. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0025] The utility model is characterized in that a sealing device is used to seal the sample to be tested on the outer sides of the diamond anvil and the upper and lower pads, and a sampling hole is provided on the side of the sealing device, and a sampling needle is used to sample gas, thereby preventing gas leakage while obtaining the gas sample.

[0026] For details, see Figure 1-4 , shows a schematic diagram of the air extraction device according to the utility model and the sealing device therein.

[0027] A gas extraction device suitable for preparing samples in a diamond anvil press, comprising a pair of upper and lower pads 5 of a diamond anvil press (DAC), a pair of diamond anvils 6, a sample to be tested 7, a sealing rubber ring 8 and a sealing device;

[0028] The pads 5 are opposed to each other up and down, and a pair of diamond anvils 6 are supported in the middle. The sample 7 to be tested is placed in the middle of the pair of diamond anvils 6.

[0029] The sealing rubber ring 8 is arranged around the outer circumference of the upper and lower pads 5, and the sealing device tightens the sealing rubber ring 8 so that a complete sealed space is formed between the pad 5, the anvil 6 and the sample 7. An air extraction hole 9 is provided on the side of the sealing device for allowing the air extraction needle to be inserted into the sealed space through the sealing rubber ring 8 to obtain gaseous substances.

[0030] Specifically, the sealing device includes a sealing half ring 1, an air extraction half ring 2, a fastening screw 3, and a fastening nut 4. The outer sides of the sealing half ring 1 and the air extraction half ring 2 have fixing holes. The sealing half ring 1 and the air extraction half ring 2 are clamped on the outer side of the sealing rubber ring 8 to fix the sealing rubber ring. The fastening screw 3 and the fastening nut 4 are connected and fixed through the fixing holes to fix the sealing device. The air extraction hole 9 is provided on the side of the air extraction half ring 2.

[0031] The outer diameter of a common commercial gas extraction needle is usually in the range of 0.2-1.0 mm, and the position of the gas extraction hole is customized according to the size of the gas extraction needle.

[0032] The sealing rubber ring 8 comprises two half rings and is usually made of silicone rubber, which has the advantages of being puncture-resistant, less sticking and having good sealing properties.

[0033] The sealing device is made of stainless steel or titanium alloy, preferably titanium alloy, which is more corrosion-resistant.

[0034] When in use, follow the conventional method of using the diamond anvil press, and place the sample to be tested 7 between the upper and lower diamond anvils 6. After completing the experimental requirements of the sample through various experimental conditions, clamp the two half rings of the sealing device 4 on the periphery of the upper and lower pads 5, and use an external wrench to tighten the fastening screws and nuts to connect and fix them with the sealing rubber ring to form a complete sealed space. Then insert the gas extraction needle of the gas chromatography detection instrument into the sealed space through the reserved gas extraction hole 9 of the gas extraction half ring 2, slowly open the locking screw of the press, release the gas phase sample to be tested from between the upper and lower anvils into the sealed space, and perform gas chromatography detection test through the inserted gas extraction needle. After the test is completed, loosen the fastening screws 3 and the fastening nut 4 and remove the two half rings. In this way, the experimental process is completed, and the sample can be replaced and tested again later.

[0035] After undergoing ultra-high pressure or high-pressure experiments with temperature conditions in the previous press, the sample to be tested undergoes certain special physical and chemical changes, and the sample between the upper and lower anvils undergoes certain gas phase changes. Due to the ultra-high pressure characteristics of the diamond anvil press, the sample volume is generally relatively small, around microliters. The utility model uses a sealing rubber ring and a sealing device to construct a sealed space between the upper and lower pads, the upper and lower anvils, and the sample to be tested, allowing only the gas extraction needle to pass through. It is particularly suitable for such situations and has the following advantages:

[0036] 1. It avoids the possibility of leakage of samples after they are exposed once the press is opened and cannot be tested. It can reduce the leakage of gas phase samples when the sample amount is extremely small, so as to facilitate subsequent gas chromatography detection.

[0037] 2. The gas extraction device is simple to operate and easy to assemble and disassemble. It can customize different half-ring sizes and gas extraction pinhole sizes according to different presses. It has strong adaptability and is particularly suitable for specific test experiments.

[0038] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection of the present invention determined by the submitted claims.

Claims

1. A gas extraction device suitable for preparing samples in a diamond anvil press, characterized by: It includes a pair of upper and lower pads of a diamond anvil cell press (DAC), a pair of diamond anvil cells, a sample to be tested, a sealing rubber ring and a sealing device; The pads are opposed to each other up and down, with a pair of diamond anvils in the middle, and the sample to be tested is placed in the middle of the pair of diamond anvils. The sealing rubber ring is arranged around the outer circumference of the upper and lower pads, and the sealing device tightens the sealing rubber ring to form a complete sealed space between the pad, the anvil and the sample to be tested. An air extraction hole is provided on the side of the sealing device to allow the air extraction needle to be inserted into the sealed space through the sealing rubber ring to obtain gaseous substances.

2. The air extraction device according to claim 1, characterized in that: The sealing device includes a sealing half ring, an air extraction half ring, a fastening screw and a fastening nut. The outer sides of the sealing half ring and the air extraction half ring are provided with fixing holes. The sealing half ring and the air extraction half ring are clamped on the outer side of the sealing rubber ring to fix the sealing rubber ring. The fastening screw and the fastening nut are connected and fixed through the fixing hole to fix the sealing device. The air extraction hole is provided on the side of the air extraction half ring.

3. The air extraction device according to claim 1 or 2, characterized in that: The position of the air extraction hole is customized according to the size of the air extraction needle.

4. The air extraction device according to claim 3, characterized in that: The sealing rubber ring comprises two half rings.

5. The air extraction device according to claim 4, characterized in that: The sealing rubber ring is made of silicone rubber.

6. The air extraction device according to claim 1, characterized in that: The sealing device is made of stainless steel or titanium alloy.

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