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Interfacial Investigation of Palmitic Acid Monolayers

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Presentation on theme: "Interfacial Investigation of Palmitic Acid Monolayers"— Presentation transcript:

1 Interfacial Investigation of Palmitic Acid Monolayers
Cheng Y. Tang Allen Group June 21th, 2007 Department of Chemistry The Ohio State University

2 Background IPCC estimated ~ 3.3 billion metric tons sea salt
emission into atmosphere annually Biological oil slick (200 Tg/year) is main contributor of fat-coated marine aerosol Dobson et al., PNAS., 97, 11864, 2000 TOF-SIM C16 Palmitic acid (C16) is most abundant saturated fatty acid Oleic acid (C18) is most abundant unsaturated fatty acid C18 Heikki Tervahattu, Journal of Geophysical Research, Vol. 107, 2002

3 Background

4 Broad Bandwidth Sum Frequency Generation Vibrational Spectroscopy (BBSFG)

5 Experimental Setup Couple Langmuir Trough with BBSFG
to do concurrent study of Palmitic Acid Monolayer

6 Compression Isotherm uc tc g Snap-shots of Palmitic Acid Monolayer
untilted condensed (uc) uc tilted condensed (tc) gaseous (g) tc g Snap-shots of Palmitic Acid Monolayer Spectra during compression

7 Compression Isotherm g uc tc g uc tc

8 Compression Isotherm

9 Compression Isotherm

10 Compression Isotherm

11 Palmitic Acid Isotherm
BBSFG Spectroscopic Study Palmitic Acid Isotherm 2nd point at 30 mN/m (uc) 1st point at 10 mN/m (tc)

12 SFG Polarization and Peak Assignments
SS – symmetric stretch, FR – Fermi Resonance

13 SFG Polarization and Peak Assignments
AS – asymmetric stretch

14 SFG Polarization and Peak Assignments
SS – symmetric stretch, AS – asymmetric stretch, FR – Fermi Resonance

15 BBSFG SSP Palmitic Acid Spectra on 0.2M Salts
CH3-SS/CH2-SS Chain is more ordered, less gauche defects CH3-SS CH2-SS CH2-FR CH3-SS CH3-SS/CH2-SS is largest in CaCl2 CH2-FR contribution is smallest CH2-SS CH2-FR

16 BBSFG Palmitic Acid Spectra at 30mN/m
Spectral results show similar chain conformation and packing at 30mN/m Consistent with Mean Molecular Area data

17 Conclusion BBSFG data confirm dynamic structural change of the Palmitic Acid Monolayer during compression In the tilted condensed phase, CaCl2 induces condensing of the Palmitic Acid Monolayer In untilted condensed phase, chain conformation and packing of Palmitic Acid monolayers are similar on salt solutions

18 Acknowledgements Dr. Heather C. Allen (Advisor) Dr. Gang Ma
Dr. Laura Voss All other Allen group members NSF-ATM Funding

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