Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 21, Pages 3737-3741Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz5019724
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- NanoNextNL, a micro- and nanotechnology consortium of the Government of The Netherlands
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We combine second-order nonlinear vibrational spectroscopy and quantum-chemical calculations to quantify the molecular tilt angle and the structural variation of a decanoic acid surfactant monolayer on water. We demonstrate that there is a remarkable degree of delocalization of the vibrational modes along the backbone of the amphiphilic molecule. A simulation-based on modeled sum frequency generation (SFG) spectra offers quantitative insights into the disorder of surfactant monolayers at the water-air interface. It is shown that an average of one gauche defect in the alkyl chain suffices to give rise to the methylene stretch intensity similar in magnitude to the methyl stretch. [GRAPHICS]
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