percolation threshold

in a composite material
https://doi.org/10.1351/goldbook.08848
Minimal volume fraction of functionally active small particles evenly dispersed in a non-active matrix, at which the long-range (infinite) functional connectivity in the system is achieved.
Notes:
  1. A desired transport through the composite material is not possible below the percolation threshold. Percolation threshold is about 0.3 to 0.35 (by volume) for composites with nearly spherical disperse particles while it can be even below 0.10 for composites with short fibers, depending on the fibers’ aspect ratio (the length to diameter ratio).
  2. Electrically conducting polymer composites composed of carbon black microparticles dispersed in a rubbery matrix are transposed in the electrically conducting state above percolation threshold.
Source:
PAC, 2022, 94, 15. (Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)) on page 40 [Terms] [Paper]
Citation: 'percolation threshold' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08848 RIS BibTex EndNote
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