METHOD OF DETERMINING DIFFUSION COEFFICIENT IN SHEET CAPILLARY-POROUS MATERIALS Russian patent published in 2024 - IPC G01N13/00 G01N15/08 

FIELD: measurement.

SUBSTANCE: use to determine diffusion coefficient in sheet capillary-porous materials. Essence of the invention consists in the fact that in the analysed sheet material there is created a uniform initial content of the solvent distributed in the solid phase, then the analysed material is placed on a flat substrate from a solvent-impermeable material, the upper surface of the material is waterproofed, at the initial moment of time, pulse point moistening of the upper surface of the investigated article is carried out with a dose of a solvent, then change in time of signals of galvanic sensors less distant from the first and more distant second from the source is measured, which are located at distances r₁ and r₂, respectively, from the point of application of the pulse with a dose of the solvent, and the moments of time τ₁ and τ₂ are recorded, at which the same values of the signals of the first E₁ and the second E₂ sensors are achieved on the descending branches of the curves of the change in signals in time of these two sensors and the diffusion coefficient is calculated, wherein solvent dose is selected for point moistening of top surface of analysed article to calculate required diffusion coefficient.

EFFECT: high accuracy of measuring diffusion coefficient.

4 cl, 3 dwg