Science Advances

Supplementary Materials

The PDF file includes:

  • Supplementary Text
  • Fig. S1. Morphology of the superomniphobic ridge.
  • Fig. S2. Computational domain.
  • Fig. S3. Components of the total kinetic energy.
  • Fig. S4. Velocity vectors and pressure distribution (yz view).
  • Fig. S5. Coalescence-induced jumping of smaller droplets.
  • Fig. S6. Coalescence of low–surface tension and high-viscosity droplets.
  • Fig. S7. Schematic of a superrepellent surface with periodic arrangement of triangular ridges.
  • Fig. S8. Schematic of two coalescing droplets and a ridge with maximum ridge angle.
  • Fig. S9. Schematic depicting the influence of nondimensional ridge height h* on the maximum ridge angle αmax.
  • Table S1. Density, viscosity, surface tension, apparent advancing contact angle, apparent receding contact angle, and roll-off angle of test liquids on superomniphobic surfaces.
  • Table S2. Influence of the ridge angle α on the energy conversion efficiency η in coalescence-induced jumping of droplets with radius R0 = 600 μm at different nondimensional ridge heights h*.
  • Legends for movies S1 to S6.

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Other Supplementary Material for this manuscript includes the following:

  • Movie S1 (.mp4 format). This video illustrates (experimentally and numerically) the coalescence-induced self-propulsion of two droplets of water (R0 ≈ 600 μm) on a superomniphobic surface without a ridge.
  • Movie S2 (.mp4 format). This video illustrates (experimentally and numerically) the coalescence-induced self-propulsion of two droplets of water (R0 ≈ 600 μm) on a superomniphobic surface with a ridge (ridge height hr ≈ 500 μm).
  • Movie S3 (.mp4 format). This video illustrates the evolution of the velocity vectors within two droplets of water (R0 ≈ 600 μm) during their coalescence on a superomniphobic surface with and without a ridge.
  • Movie S4 (.mp4 format). This video illustrates (experimentally and numerically) the coalescence-induced self-propulsion of two droplets (R0 ≈ 480 μm) of a low–surface tension liquid (n-tetradecane with γlv ≈ 26.6 mN m−1) on a superomniphobic surface with a ridge.
  • Movie S5 (.mp4 format). This video illustrates (experimentally and numerically) the coalescence-induced self-propulsion of two droplets (R0 ≈ 480 μm) of a high-viscosity liquid (water + 90% glycerol with μ ≈ 220 mPa·s) on a superomniphobic surface with a ridge.
  • Movie S6 (.mp4 format). This video illustrates the coalescence of two low–surface tension droplets (n-tetradecane with γlv ≈ 26.6 mN m−1 and R0 ≈ 480 μm) and two high-viscosity droplets (water + 90% glycerol with μ ≈ 220 mPa·s and R0 ≈ 480 μm) on a superomniphobic surface without a ridge.

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