Directional percolating pathways in demixing blends on a wetting substrate

We investigate demixing in symmetric binary blends on a substrate preferentially wet by one of the fluids from the perspective of such a percolation threshold to achieve directed and connectivity percolation

Abheeti Goyal; Paul van der Schoot; Federico Toschi

2021

Scholarcy highlights

  • Understanding the dynamical evolution of a percolating network during liquid–liquid demixing is crucial for many technological applications, including plastic electronics, such as organic photovoltaics, whose performance depends on the efficiency to transport the positive and negative charge carriers to the corresponding electrodes
  • We investigate demixing in symmetric binary blends on a substrate preferentially wet by one of the fluids from the perspective of such a percolation threshold to achieve directed and connectivity percolation
  • It is commonly assumed that the bicontinuous morphology of a symmetric blend guarantees percolation, where the average concentration of the blend distinguishes the two phases
  • If the percolation threshold is larger than the average concentration, we find that percolating pathways grow monotonically and a percolating cluster forms only after a time lag
  • We find that this time lag is characterized by two universal kinetic regimes that can explain all our observations
  • The second regime displays an algebraic growth with an exponent of 1/3 and we argue that it must be associated with the directional connectivity of the wetting phase to the substrate

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