Structures of Palmitoyl-landdl-Lysine Monolayers at the Air−Water Interface − Polarization Modulation Infrared Reflection Absorption Spectroscopic Study

Langmuir ◽  
2006 ◽  
Vol 22 (22) ◽  
pp. 9208-9213 ◽  
Author(s):  
Koichi Itoh ◽  
Hukuhiro Oguri
Keyword(s):  
Spectroscopic Study ◽  
Polarization Modulation ◽  
Water Interface ◽  
Interface Polarization ◽  
Infrared Reflection ◽  
Air Water Interface

Investigations at the air/water interface using polarization modulation IR spectroscopy

1996 ◽  
Vol 92 (4) ◽  
pp. 525 ◽  
Author(s):  
Daniel Blaudez ◽  
Jean-Marie Turlet ◽  
Jean Dufourcq ◽  
Delphine Bard ◽  
Thierry Buffeteau ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Polarization Modulation ◽  
Water Interface ◽  
Air Water Interface

Infrared Hide-and-Seek: Vibrational Excitons Conceal Surfactants at the Air/Water Interface

2020 ◽  
Author(s):  
Kimberly A. Carter-Fenk ◽  
Kevin Carter-Fenk ◽  
Michelle E Fiamingo ◽  
Heather Allen ◽  
John M. Herbert
Keyword(s):  
Arachidic Acid ◽  
Ionic Composition ◽  
Molecular Organization ◽  
Water Interface ◽  
Vibrational Coupling ◽  
One Dimensional ◽  
Infrared Reflection ◽  
Air Water Interface ◽  
Interface Science ◽  
Intermolecular Distances

<p>Surface-sensitive vibrational spectroscopy is a common tool for measuring molecular organization and intermolecular interactions at interfaces. Peak intensity ratios are typically used to extract molecular information from one-dimensional spectra but vibrational coupling between surfactant molecules can manifest as signal depletion in one-dimensional spectra. Through a combination of experiment and theory, we demonstrate the emergence of vibrational excitons in infrared reflection-absorption spectra of soluble and insoluble surfactants at the air/water interface. Vibrational coupling yields a signicant decrease in peak intensities corresponding to C-F vibrational modes of perfluorooctanoic acid molecules. Vibrational excitons also form between arachidic acid surfactants within a compressed monolayer, manifesting as signal reduction of C-H stretching modes. The aqueous phase ionic composition impacts surfactant intermolecular distances, thereby modulating vibrational coupling strength between surfactants. Our results serve as a cautionary tale against employing alkyl and fluoroalkyl vibrational peak intensities in analyses that are ubiquitous in interface science.</p>

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