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...

AI Technical Summary

Problems solved by technology

The problems of the current mainstream design in the market are: 1. Different nitrogen partial pressure P / P is adjusted each time 0 , the liquid nitrogen cup needs to move up and down several times, change the temperature of the sample, and carry out the test under the state of adsorption and desorption

Such up and down movement increases the complexity and difficulty of design and implementation, and is prone to wear and failure; 2. Adjust different nitrogen partial pressure P / P each time 0 , the up and down movement of the liquid nitrogen cup greatly reduces the test efficiency

This has been increasingly unable to meet the rapid and real-time detection requirements in production and scientific research

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