Study of Langmuir Monolayers of Arachidic Acid on Saline Solutions Using Sum-frequency Generation Vibrational Spectroscopy
Main Article Content
Abstract
Abstract: In this report, we studied the effect of halide salt concentration on Arachidic Acid (AA) Langmuir monolayers formed on salt solutions, such as NaCl, NaI, NaF by using a Sum-Frequency Generation Vibrational Spectroscopy. In the SFG spectra, we observed the peak intensities of CH3FR and CH3SS vibrational modes decreased when increasing the salt concentration. This observation indicates that the structure of the AA monolayer was disordered by the interaction of the dissolved ions with the carboxyl head groups of the monolayer.
Keywords:
Langmuir monolayer, interfacial structure, Sum-frequency vibrational spectroscopy.
References
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[2] Du, Q.; Superfine, R.; Freysz, E.; Shen, Y. R., Vibrational Spectroscopy of Water at the Vapor/Water Interface, Physical Review Letters 70 (1993) 2313.
[3] P.Guyot – Sionnest, J.H.Hunt, and Y.R.Shen, Sum – Frequency Vibrational Spectroscopy of a Langmuir Film: Study of Molecular Orientation of a Two Dimensional System, Physical Review Letters 59 (1987) 1597.
[4] Chuanshan Tian, Steven J. Byrnes,Hui-Ling Han, and Y. Ron Shen, Surface Propensities of Atmospherically Relevant Ions in SaltSolutions Revealed by Phase-Sensitive Sum Frequency VibrationalSpectroscopy, Journal Physical Chemistry Letters 2 (2011) 1946.
[5] Pavel Jungwirth, and Douglas J. Tobias, Ions at the Air/Water Interface, Journal Physical Chemistry B 106 (2002) 6361.
[6] Elizabeth A. Raymond and Geraldine L. Richmond, Probing the Molecular Structure and Bonding of the Surface of Aqueous Salt Solutions, Journal Physical Chemistry B 108 (2004) 5051.