Percolation in carbon black powders

✍ Scribed by Françoise Ehrburger-Dolle; Jacques Lahaye; Shinji Misono

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 721 KB
• Volume: 32
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(94)90123-6

✦ Synopsis

The variation of conductivity and pressure transmitted by several carbon black powders is measured as a function of the solid volume fraction during low-speed uniaxial compaction.

For all samples made of aggregates, the experimental results of both pressure and conductivity can be fitted with a percolation law. The percolation thresholds are, however, much smaller than the theoretical value +* = 0.15. It is shown that the percolation threshold depends on the mass fractal dimension and on a length R,,,,, characteristic of the aggregates of a given carbon black.