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Method for improving measurement accuracy of pore structure parameters

A technology for parameter determination and accuracy, used in measurement devices, suspension and porous material analysis, instrumentation, etc., to solve problems such as difficult to observe phase equilibrium transitions

Active Publication Date: 2020-09-15
XI'AN PETROLEUM UNIVERSITY +1
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  • Abstract
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Problems solved by technology

However, in the actual detection, due to the existence of certain energy barriers between different adsorption phases, it is difficult to observe the phase equilibrium transition in the experiment.

Method used

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  • Method for improving measurement accuracy of pore structure parameters
  • Method for improving measurement accuracy of pore structure parameters
  • Method for improving measurement accuracy of pore structure parameters

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Embodiment

[0026] Below in conjunction with the accompanying drawings, the argon gas-MCM41 cylindrical hole system is used as an example for detailed description. It should be emphasized that the following description is exemplary only, and is not intended to limit the scope of the invention and its application.

[0027] Step 1: Use a specific surface area and pore size analyzer to test the adsorption-desorption curve of the MCM41 sample. According to the test data, the pore size range data of the material to be tested is 1.5-2.5nm.

[0028] Step 2: According to the selected material pore size range of 1.5-2.5 nm in step 1, select the peak value of 2.0 nm as the simulated pore size, build a simulated calculation structure model, and use the giant canonical ensemble (GCMC) molecular simulation system. Lowering the chemical potential of the bulk fluid leads to an adsorption hysteresis loop composed of stable and metastable fluids in the nanopore.

[0029] Step 3: Select the specific adso...

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Abstract

The invention provides a method for improving the measurement accuracy of pore structure parameters. The method is suitable for the field of measurement of pore diameter and specific surface area parameters of nano porous materials. The method specifically comprises the following steps: testing an adsorption-desorption curve of a to-be-tested material sample by using a specific surface area and pore size analyzer; obtaining pore size range data of the to-be-tested material according to the test data; selecting a specific numerical value in the pore diameter range of the to-be-detected materialby utilizing a giant regular ensemble (GCMC) molecular simulation system, building a simulation calculation structure model, and continuously increasing or decreasing the chemical potential of a mainfluid to obtain an adsorption hysteresis loop consisting of a stable state and a metastable state of the fluid in a nanopore; and selecting a particle system with an intermediate state at a given adsorption pressure position in the adsorption hysteresis loop. Analog computation involved in the method can be embedded into analysis software of a test instrument, the operation is simple, and the accuracy of detection results of the pore diameter and the specific surface area of the nano-porous material can be effectively improved.

Description

technical field [0001] The invention relates to the field of measurement of pore size and specific surface area parameters of nanoporous materials, in particular to a method for improving the measurement accuracy of pore structure parameters. Background technique [0002] The characterization of pore structure parameters of nanoporous materials is the basis for their physical properties research and specific performance applications. At present, the pore structure of nanoporous materials is mainly studied by diffraction, spectroscopy, microscopy, adsorption-desorption and related mechanical properties. The most commonly used characterization method is microscopy, but this method is difficult to analyze structural factors such as internal pore type and porosity. [0003] The main methods for finding the pore size distribution are the DH method (assuming that all pores are cylindrical with open ends), the BJH method, the diffraction method of X-ray and neutron rays, and the s...

Claims

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Application Information

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IPC IPC(8): G01B21/14G01N15/08
CPCG01B21/14G01N15/088
Inventor 刘忠军赵明慧姬帅
Owner XI'AN PETROLEUM UNIVERSITY
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