METHOD TO DETERMINE PROPERTIES OF POROUS MATERIALS Russian patent published in 2013 - IPC G01N25/20 

FIELD: measurement equipment.

SUBSTANCE: at first a sample of a porous material is placed into a calorimeter cell, and pressure in the cell with the sample is increased step by step by means of filling of the cell with a wetting fluid and soaking of the sample at each stage until thermal flow stabilises. At each step thermal flow towards the cell and liquid volume are measured. Then pressure of the wetting liquid in the cell is reduced to the pressure achieved at the first step, with permanent registration of thermal flow into the cell. At least once they repeat step-by-step increase of liquid pressure in the cell with subsequent reduction to the value of liquid pressure achieved at the first step. Then under permanent pressure they reduce temperature in the calorimeter cell to temperature below the point of crystallisation of wetting fluid with permanent measurement of thermal flow and liquid volume. After complete crystallisation of liquid in sample pores they increase temperature in the calorimeter cell to the value above the melting temperature of the wetting fluid with permanent measurement of thermal flow and liquid volume. On the basis of thermal flow measurement results with account of thermal effect from liquid compression they calculate a contact angle of wetting of liquid-filled pores, and also pore size.

EFFECT: increased accuracy to determine properties and expand range of identified pore dimensions, possibility to investigate micropores.

6 cl, 2 dwg