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Surface Tension, Surfactants, and Sea Foam: Day 2.

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Presentation on theme: "Surface Tension, Surfactants, and Sea Foam: Day 2."— Presentation transcript:

1 Surface Tension, Surfactants, and Sea Foam: Day 2

2 II. Surface tension – Soapy and Sticky Bubbles Now we will share data as a class and complete your lab worksheets.

3 Solution 1: soapySolution 2: soapy and sticky Group Number Avg. height (cm) Avg. life span (sec) Avg. height (cm) Avg. life span (sec) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Class Average II. Surface tension – Soapy and Sticky Bubbles (class data)

4 III. Surfactants and ocean surfactants

5 Surfactants are compounds that lower the surface tension of water surfactant Answer question #1 now

6 III. Surfactants and ocean surfactants World production: 15 Mton/yr Half of that production is soaps What makes the other half? ○ biological productivity Common types Sodium stearate 4-(5-Dodecyl) benzenesulfonate ?

7 III. Surfactants and ocean surfactants What role do surfactants play on bubbles? Hint: there is still surface tension between water molecules, but the soap has lowered its effect Answer question #2 now

8 IV. Sea foam

9 What is foam? A substance that is formed by trapping pockets of gas in a liquid of solid Commercial foams ? Answer question #3 now

10 IV. Sea foam Which situation involving sea foam is more important to air-sea gas transfer and cloud formation? AB Answer question #4 now

11 IV. Sea foam Wave breaking Lamarre (1993) Answer question #5 now

12 IV. Sea foam Whitecapping Answer question #6 - #8 now

13 V. Cloud nucleation

14 Bursting bubbles Lhuissier, Villermaux (2011) Answer question #9 now

15 V. Cloud nucleation The spray from bursting bubbles in sea foam are important for marine cloud formation! PK Quinn & TS Bates Nature 480, 51-56 (2011) doi:10.1038/nature10580 Answer question #10 now

16 V. Cloud nucleation Feedback loop involving dimethyl sulphide PK Quinn & TS Bates Nature 480, 51-56 (2011) doi:10.1038/nature10580

17 VI. Technology

18 How can we measure whitecapping Callaghan (2009)

19 VI. Technology Whitecap coverage vs. wind speed Answer questions #11 - #13 now

20  SURFACTANTS LOWER SURFACE TENSION  OCEAN SURFACTANTS ARE NATURALLY OCCURRING  SURFACTANTS ALLOW THE PERSISTENCE OF SEA FOAM  BUBBLES ROLE IN MARINE CLOUD PRODUCTION Conclusions

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