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Atmospheric β-Caryophyllene-Derived Ozonolysis Products at Interfaces

preprint
submitted on 19.10.2018 and posted on 19.10.2018 by Ariana Gray Bé, Hilary M. Chase, Liu, Yangdongliu, Mary Alice Upshur, Zhang, Yue, Aashish Tuladhar, Zizwe A. Chase, Aleia D. Bellcross, Wang, Zheming, Wang, Hong-fei, Victor Batista, Martin, Scot, Regan J. Thomson, Franz Geiger

By integrating organic synthesis, secondary organic aerosol synthesis and collection, DFT calculations, and vibrational sum frequency generation spectroscopy, we identify close spectral matches between the surface vibrational spectra of β-caryophyllene-derived secondary organic material and those of β-caryophyllene aldehyde and β-caryophyllonic acid at various interfaces. Combined with the record high surface tension depression described previously for these same oxidation products, we discuss possibilities for an intrinsically chemical origin for cloud activation by terpene-derived surfactants. Although the present study does not unequivocally identify the synthesized and analyzed oxidation products on the β-caryophyllenederived SOM surfaces, these two compounds appear to be the most surface active out of the series, and have also been foci of previous β-caryophyllene field and laboratory studies.

An orientation analysis by phase-resolved SFG spectroscopy reveals a “pincer-like” configuration of the β-caryophyllene oxidation products, albeit on a model quartz surface, that somewhat resembles the orientation of inverse double-tailed surfactants at the surfaces biological systems. The structural information suggests that the less polar moiety of a surface-localized oxidation product, such as those studied here, may be the first site-of-contact for a gas-phase molecule approaching an SOA particle containing surface-active β-caryophyllene oxidation products.

History

Email Address of Submitting Author

geigerf@chem.northwestern.edu

Institution

Northwestern University

Country

United States

ORCID For Submitting Author

0000-0001-8569-4045

Declaration of Conflict of Interest

n.a.

Exports