Patent ID: 9574987
Date: 2017-02-21
CPC Classifications: G01N

Claim:
1. A method for determining properties of porous materials comprising: placing a sample of a porous material into a calorimetric cell, increasing step by step a hydrostatic pressure in the calorimetric cell with the sample starting from a pressure value of a first step by filling the cell with a wetting fluid and keeping until stabilization of a heat flow at each step, measuring the heat flow to the calorimetric cell and a volume of fluid at each step, decreasing the hydrostatic pressure of the wetting fluid in the calorimetric cell down to the pressure value of the first step with continuous measurement of the heat flow to the cell, at least once repeating step by step increase and following decrease of the fluid pressure in the calorimetric cell down to the pressure value of the first step, decreasing a temperature of the calorimetric cell at constant hydrostatic pressure below a crystallization point of the wetting fluid with continuous measurement of the heat flow and the fluid volume, after completion of fluid crystallization in pores of the sample increasing the temperature of the calorimetric cell above a melting point of the wetting fluid with continuous measurement of the heat flow and the fluid volume, calculating contact angles and pore size distribution of the pores of the sample filled with the wetting fluid based on results of heat flow measurement and taking into account a heat effect from fluid compressibility.