Science Advances

Supplementary Materials

This PDF file includes:

  • S1. Synthesis of saturated analog.
  • S2. Herding efficiency in terms of herding dynamics.
  • S3 to S5. Determination of surface tension and interfacial tension using the pendant drop method.
  • S6. Hydrolysis proof from mass spectroscopy.
  • S7. ImageJ computer program.
  • Fig. S1. Reaction scheme of the synthesis of hexadecylpyridinium bromide.
  • Fig. S2. Evaluation of the herding efficiency by fitting the area of oil slick obtained at 20°C in freshwater as a function of time.
  • Fig. S3. Air-water surface tension for PIm using a pendant drop tensiometer.
  • Fig. S4. Toluene-water interfacial tension for PIm using Pendant drop tensiometer.
  • Fig. S5. In situ air-water surface tension of PIm using a Wilhelmy plate tensiometer.
  • Fig. S6. ESI-HRMS of PPy at the beginning, after 8 days, and after 1 month.
  • Fig. S7. Representative example of calculating the thickness of oil slick using ImageJ computer program.
  • Table S1. Data obtained for different images of an oil slick spread over freshwater at 20°C in a plastic tray; PPy was used as a chemical herder to retract the oil slick.

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