Mercury intrusion determines pore size distribution
Mercury intrusion is a method for determining the pore size distribution of materials, using the different permeability of mercury to different pore sizes to distinguish and measure. Mercury intrusion has the advantages of wide measurement range, high accuracy and good reproducibility, and is widely used in materials science, soil science, environmental science and other fields. This article will introduce the principles, protocols, data processing, and application examples of mercury intrusion.
1. The principle of mercury intrusion.
The basic principle of mercury intrusion is to measure the pore size by using the different permeability of mercury to different pore sizes. When a certain amount of pressure is applied to the mercury, only small apertures allow mercury to pass through, and large apertures do not. By measuring the permeability of mercury at different pressures, pore volumes of different pore sizes can be obtained, and pore size distributions can be calculated.
2. Experimental procedures.
1.Sample preparation: The material to be tested is ground into powder, sieved and loaded into a sample dish, and placed in a constant temperature oven for drying.
2.Instrument preparation: Clean the mercury porosiometer and check whether the mercury bottle is in good condition to ensure that there is no leakage.
3.Sample measurement: Place the dried sample dish into a mercury porosiometer and record the amount of mercury permeable at each pressure point.
4.Data processing: Draw pore size distribution curves based on experimental data, and calculate the pore volume in each pore size range.
5.Result analysis: The experimental results were analyzed to obtain the pore size distribution law.
3. Data Processing.
Data processing is one of the key aspects of the determination of pore size distribution by mercury intrusion. Through the collation and calculation of experimental data, the pore size distribution curve and the pore volume in each pore size range can be obtained. The specific steps for data processing are as follows:
1.The experimental data were organized into ** form, including pressure point, mercury permeability and other data.
2.According to the experimental data, the pore size distribution curve is plotted, the abscissa is the pore aperture, and the ordinate is the pore volume.
3.Calculate the pore volume in each pore size range, which can be calculated using the integral or differential method.
4.The error analysis of the experimental results was carried out to evaluate the reliability and accuracy of the results.
Fourth, application examples.
Mercury intrusion has a wide range of applications in many fields, and here are some examples of applications:
1.Materials Science: In materials science, mercury intrusion is used to study the pore structure, specific surface area, and other properties of materials. For example, in ceramic materials, the effects of pore size distribution and porosity on material properties can be studied by mercury intrusion. In activated carbon, the relationship between pore size distribution and adsorption performance can be studied by mercury intrusion.
2.Soil science: In pedology, mercury intrusion is used to study the pore structure and water distribution of soils. For example, in soil research, mercury intrusion can be used to understand the water-holding capacity, aeration performance and microbial activity of soil.
3.Environmental science: In environmental science, mercury intrusion is used to study the adsorption of pollutants in water bodies, the migration of soil pollutants, etc. For example, in the study of groundwater pollution, the adsorption and diffusion of pollutants in the soil can be understood through mercury intrusion, which provides a basis for pollution control.
4.Other fields: In addition to the above-mentioned fields, mercury intrusion is also widely used in the petroleum industry, biology, medicine, and other fields. For example, in the petroleum industry, the reservoir parameters and seepage characteristics of oil reservoirs can be studied by mercury intrusion; In biology, mercury intrusion can be used to study the pore structure and physiological functions of biological tissues.
In conclusion, mercury intrusion has a wide range of applications as a method for determining the pore size distribution of materials. With the development of science and technology and the deepening of research, the application field of mercury intrusion method will continue to expand, providing more accurate and reliable measurement methods for scientific research in various fields.