What are the methods for measuring macropore distribution?

The macropores mentioned here refer to pores with diameters ranging from a few tenths of a micron to tens of microns. Although mercury porosimetry measurement under negative pressure can also measure micron levels, it is not practical. One is that the error is large, the other is that the environmental protection conditions are poor, and the third is that the mercury porosimetry method does not measure all through holes, but also includes blind holes.

At present, most of the materials that require measurement of large pores are various filters, oil drilling cores or soil samples. What is required to measure is the pore size of through holes. Blind holes are meaningless, so they are not expected to be measured. There are many measurement methods for measuring such through holes, such as bubble method, liquid-liquid method, centrifugal method, sedimentation balance method, conductivity method, reverse diffusion method, etc. (For details, see "Powder Particles" edited by Hu Rongze et al. and pore measurement”).