Science Advances

Supplementary Materials

The PDF file includes:

  • Section S1. Lower rebound limit
  • Section S2. Setup for bottom view reflection contrast imaging
  • Section S3. Original images combined bottom and side view
  • Section S4. Acceleration and terminal velocity of the compound drop
  • Section S5. Motion of the core with respect to the shell
  • Section S6. Further notes on the core position model
  • Section S7. Rebounded volume (decomposition)
  • Section S8. Pinch-off height
  • Section S9. Parameter space injection method
  • Section S10. Discussion on the oil film stability and rupture
  • Section S11. Fluid properties
  • Section S12. Supplementary videos captions
  • Fig. S1. Model for the lower rebound limit.
  • Fig. S2. Setup for reflection contrast imaging.
  • Fig. S3. Original images combined bottom and side view.
  • Fig. S4. Impact velocity V as a function of impact height h.
  • Fig. S5. Model for the core position with refined initial conditions.
  • Fig. S6. Model for the core position, considering added mass.
  • Fig. S7. Volumes of rebounded water-in-oil drops and the jet as a function of the impact height h, the substrate wetting properties, and the compound drop-generation method.
  • Fig. S8. Pinch-off height hpo of the rebounding core.
  • Fig. S9. Map of the rebound behavior after impact on a hydrophilic surface as a function of the water volume fraction α and the impact height (left axis) and Weber number We (right axis), for compound drops produced with the injection method.
  • Fig. S10. Oscillations after pinch-off of a compound drop from the needle.
  • Fig. S11. Theoretical predictions for the critical oil layer thickness.
  • Fig. S12. Comparison of experimental data with lines of constant Weber number.
  • Legends for movies S1 to S8
  • References (6176)

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Other Supplementary Material for this manuscript includes the following:

  • Movie S1 (.mov format). Impact of a compound drop (α = 0.3) on a hydrophilic surface (Fig. 1A).
  • Movie S2 (.mov format). Impact of a compound drop (α = 0.3) on a hydrophilic surface (color video, Fig. 1B).
  • Movie S3 (.mov format). Bottom view reflection imaging of the impact of a compound drop (α = 0.3) on a hydrophilic surface (Fig. 3A).
  • Movie S4 (.mov format). Bottom view reflection imaging of the impact of a compound drop (α = 0.3) on a hydrophilic surface (Fig. 3C).
  • Movie S5 (.mov format). Production of a compound drop by the coaxial needle method.
  • Movie S6 (.mov format). Production of a compound drop by the coaxial needle method (pinch-off).
  • Movie S7 (.mov format). Production of a compound drop by the injection method.
  • Movie S8 (.mov format). Production of a compound drop by the injection method (pinch-off).

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