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

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Presentation transcript:

Surface Tension, Surfactants, and Sea Foam: Day 2

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

Solution 1: soapySolution 2: soapy and sticky Group Number Avg. height (cm) Avg. life span (sec) Avg. height (cm) Avg. life span (sec) Class Average II. Surface tension – Soapy and Sticky Bubbles (class data)

III. Surfactants and ocean surfactants

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

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 ?

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

IV. Sea foam

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

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

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

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

V. Cloud nucleation

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

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

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

VI. Technology

How can we measure whitecapping Callaghan (2009)

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

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