Molecular organization of a pyramidic liquid crystal at the air-water interface

Langmuir ◽  
1993 ◽  
Vol 9 (11) ◽  
pp. 3111-3114 ◽  
Author(s):  
A. El Abed ◽  
J. Daillant ◽  
P. Peretti
Keyword(s):  
Liquid Crystal ◽  
Molecular Organization ◽  
Water Interface ◽  
Air Water Interface

Investigation of dielectric relaxation phenomena in liquid crystal monolayer at the air–water interface

1998 ◽  
Vol 327-329 ◽  
pp. 232-235 ◽  
Author(s):  
Yutaka Majima ◽  
Yoko Sato ◽  
Chen-Xu Wu ◽  
Mitsumasa Iwamoto
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Phenomena ◽  
Water Interface ◽  
Air Water Interface

Formation of H-type liquid crystal dimer at air-water interface

2014 ◽  
Author(s):  
C. Karthik ◽  
Adbhut Gupta ◽  
Aditya Joshi ◽  
V. Manjuladevi ◽  
Raj Kumar Gupta ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
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>

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>

Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface

Langmuir ◽  
2016 ◽  
Vol 32 (42) ◽  
pp. 10936-10945 ◽  
Author(s):  
Ida Svanedal ◽  
Fredrik Andersson ◽  
Erik Hedenström ◽  
Magnus Norgren ◽  
Håkan Edlund ◽  
...  
Keyword(s):  
Adsorbed Layer ◽  
Ph Sensitive ◽  
Molecular Organization ◽  
Water Interface ◽  
Air Water Interface
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