Cascade dynamic nitrogen adsorption instrument

Abstract

The invention provides a design of a novel dynamic nitrogen adsorption instrument and achieves the purpose of greatly raising test speed and operational reliability of the nitrogen adsorption instrument. By the adoption of a four-way solenoid valve, gas flowing path is subtly controlled. Therefore, rapid and reliable test of sample cell in a liquid nitrogen cup is always maintained only through changing gas flow. Through switch of the solenoid valve, rapid conversion of two working conditions from nitrogen adsorption test to nitrogen partial pressure adjustment and vice verse is realized, and the sample cell is in the liquid nitrogen cup from beginning to end without the need of up-and-down motion of the liquid nitrogen cup. The invention has the advantages of simple structure, low cost, accurate control and the like.

Description

technical field

[0001] The invention relates to a micro-nano material surface characteristic analysis instrument. In particular, it relates to a new design of a dynamic nitrogen adsorption instrument, with the purpose of greatly improving the analysis and testing efficiency of the instrument. Background technique

[0002] Since the interaction between solid materials and the outside world is realized through the surface, the characteristics of the material surface are very important, no matter from the perspective of basic theory or technical application. With the development of ultrafine particles and nanomaterials, the role of the surface becomes more prominent. Surface and interfacial properties have a great impact on material properties and practical applications. Effective and reliable characterization of material surface and interface properties (specific surface and pore structure) has widely penetrated into electronic, electrical, mechanical, architectural, biologi...

Examples

Embodiment Construction

[0015] The invention adopts a four-way electromagnetic valve, cleverly controls the gas path flow circuit, and realizes fast and reliable testing that only changes the gas path flow and always keeps the sample tube in the liquid nitrogen cup.

[0016] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0017] see figure 1 , that is, the schematic diagram of the solenoid valve. The initial state of the solenoid valve (shown by the dotted line): ① and ② are conducting, ③ and ④ are conducting; (nitrogen partial pressure adjustment state); the solenoid valve is energized and the state changes (shown by the solid line): ① and ③ are conducting ② and ④ are turned on. (Nitrogen adsorption test status)

[0018] see figure 2 , figure 2 is a schematic diagram of the nitrogen partial pressure regulation state. The air inlet 12 is directly derived from the 18 air outlets by ① and...

technical field

[0001] The invention relates to a micro-nano material surface characteristic analysis instrument. In particular, it relates to a new design of a dynamic nitrogen adsorption instrument, with the purpose of greatly improving the analysis and testing efficiency of the instrument. Background technique

[0002] Since the interaction between solid materials and the outside world is realized through the surface, the characteristics of the material surface are very important, no matter from the perspective of basic theory or technical application. With the development of ultrafine particles and nanomaterials, the role of the surface becomes more prominent. Surface and interfacial properties have a great impact on material properties and practical applications. Effective and reliable characterization of material surface and interface properties (specific surface and pore structure) has widely penetrated into electronic, electrical, mechanical, architectural, biologi...

Examples

Embodiment Construction

[0015] The invention adopts a four-way electromagnetic valve, cleverly controls the gas path flow circuit, and realizes fast and reliable testing that only changes the gas path flow and always keeps the sample tube in the liquid nitrogen cup.

[0016] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0017] see figure 1 , that is, the schematic diagram of the solenoid valve. The initial state of the solenoid valve (shown by the dotted line): ① and ② are conducting, ③ and ④ are conducting; (nitrogen partial pressure adjustment state); the solenoid valve is energized and the state changes (shown by the solid line): ① and ③ are conducting ② and ④ are turned on. (Nitrogen adsorption test status)

[0018] see figure 2 , figure 2 is a schematic diagram of the nitrogen partial pressure regulation state. The air inlet 12 is directly derived from the 18 air outlets by ① and...

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