Tortuous-Path Gas Barrier in Nanocomposites

Adding a few percent of thin, impermeable nanoclay platelets to a polymer film can cut its gas permeability several-fold, not by chemistry but by geometry: every platelet a diffusing molecule meets forces it to take a longer, tortuous detour around the obstacle instead of a straight line through the matrix. This simulator runs that mechanism as a genuine 3D random walk — gas molecules diffuse upward through a box seeded with randomly placed, optionally tilted platelets, deflecting around every collision — and measures the resulting effective diffusivity live, comparing it against the analytical prediction of Nielsen's tortuosity model. Adjust filler loading, platelet aspect ratio and orientation alignment to see when the simulation matches the textbook formula and when poor exfoliation makes it fall short.