Topological Signatures of Diffusive Release in Porous Media

We used persistent homology to quantify the multiscale topological and geometric organization of porous media, including solid connectivity and the formation of loop-like and cavity-like structures across spatial scales.

Through statistical analysis, we show that these topological and geometric features are closely associated with diffusion-driven release behavior in porous media.

In particular, even within each target-porosity level, samples with richer topological features tend to exhibit long-tailed release, indicating that release behavior depends not only on the amount of pore space but also on the multiscale organization of the solid phase.

We further show that persistent homology-based features can classify release-curve regimes using a simple classification model.

Notably, feature extraction is substantially faster than finite element diffusion simulations.

Together, these results suggest that persistent homology provides a lightweight, interpretable, and geometry-based descriptor for screening diffusive release behavior in porous media.