A schematic of the experimental setup is shown in fig. S1. Bubbles or water droplets were released from a fine-end microcapillary mounted close to the bottom of a glass container (2.5 × 2.5 cm; height, 7.5 cm) that was two-thirds filled with PP1. The phase above the PP1 was either air or the water solution of 2 × 10−4 M Triton X-100 to furnish a PP1-air or PP1–water solution interface above the rising bubble or water droplet of equal interfacial tension. Bubble and water droplets of diameters D = 50 to 1000 μm were produced using different-sized microcapillaries. The free rise and collision of a bubble or water droplet with the upper PP1-air or PP1-water surface were monitored using a high-speed camera (Photron SA5) equipped with a microscope with 5× or 10× objective and using a frame rate of between 5000 and 50,000 fps.

To confirm the PP1-air interface mobility, we measured the terminal rise velocity of air bubbles and, for PP1-water interface, the terminal rise velocity of water solution droplets. To observe the effect of the surface mobility on the bounce dynamics, we compared the bounce of free-rising bubbles from the PP1-air interface corresponding to the mobile-mobile interface collision case with identical-sized free-rising bubbles for the PP1–water solution interfaces corresponding to mobile-immobile interface collision case. Respectively, using free-rising water solution droplets, we compared the bounce from PP1-air corresponding to the immobile-mobile interface case to the bounce from PP1–water solution case corresponding to immobile-immobile interface collision case. Complete experimental and numerical simulation details can be found in the Supplementary Materials.

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