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Compression of a Stearic Acid Surfactant Layer on Water Investigated by Ambient Pressure X-ray Photoelectron Spectroscopy

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Richter,  Clemens       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Dupuy,  Remi       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Oertel,  Holger
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Buttersack,  Tillmann       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Bluhm,  Hendrik       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Hoek, H., Gerber, T., Richter, C., Dupuy, R., Rapf, R. J., Oertel, H., et al. (2024). Compression of a Stearic Acid Surfactant Layer on Water Investigated by Ambient Pressure X-ray Photoelectron Spectroscopy. The Journal of Physical Chemistry B, 128(15), 3755-3763. doi:10.1021/acs.jpcb.4c00451.


Cite as: https://hdl.handle.net/21.11116/0000-000F-3DC7-D
Abstract
We present a combined Langmuir-Pockels trough and ambient pressure X-ray photoelectron spectroscopy (APXPS) study of the compression of stearic acid surfactant layers on neat water. Changes in the packing density of the molecules are directly determined from C 1s and O 1s APXPS data. The experimental data are fit with a 2D model for the stearic acid coverage. Based on the results of these proof-of-principle experiments, we discuss the remaining challenges that need to be overcome for future investigations of the role of surfactants in heterogeneous chemical reactions at liquid-vapor interfaces in combined Langmuir-Pockels trough and APXPS measurements.