Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface

© 2018 American Chemical Society. The geometry, arrangement, and orientation of a quaternary ammonium surfactant flanked by two methyl groups, a benzyl head, and an octyl tail were assessed at the air-water and air-deuterium oxide (D2O) interfaces using sum frequency generation vibrational spectrosc...

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Main Authors: Uvinduni I. Premadasa, Negar Moradighadi, Kondalarao Kotturi, Jeeranan Nonkumwong, Md Rubel Khan, Marc Singer, Eric Masson, Katherine L.A. Cimatu
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/58445
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-584452018-09-05T04:31:03Z Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface Uvinduni I. Premadasa Negar Moradighadi Kondalarao Kotturi Jeeranan Nonkumwong Md Rubel Khan Marc Singer Eric Masson Katherine L.A. Cimatu Chemistry Energy Materials Science © 2018 American Chemical Society. The geometry, arrangement, and orientation of a quaternary ammonium surfactant flanked by two methyl groups, a benzyl head, and an octyl tail were assessed at the air-water and air-deuterium oxide (D2O) interfaces using sum frequency generation vibrational spectroscopy. Remarkably, symmetric and asymmetric N-CH3stretches (at ∼2979 and ∼3045 cm-1, respectively, in the SSP polarization combination) were visible in water but negligible in deuterium oxide. We concluded that D2O addition triggers the average reorientation of the dimethyl amino units parallel to the interface and possibly changes the overall conformation of the surfactant. A reduced number of gauche defects in the surfactant octyl chain is also observed in D2O. Tilt angles for the octyl chain (1.0-10.8°) are consistent with an ordered monolayer at the air-liquid interface. 2018-09-05T04:24:10Z 2018-09-05T04:24:10Z 2018-07-19 Journal 19327455 19327447 2-s2.0-85049366172 10.1021/acs.jpcc.8b03680 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049366172&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/58445
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Chemistry
Energy
Materials Science
spellingShingle Chemistry
Energy
Materials Science
Uvinduni I. Premadasa
Negar Moradighadi
Kondalarao Kotturi
Jeeranan Nonkumwong
Md Rubel Khan
Marc Singer
Eric Masson
Katherine L.A. Cimatu
Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface
description © 2018 American Chemical Society. The geometry, arrangement, and orientation of a quaternary ammonium surfactant flanked by two methyl groups, a benzyl head, and an octyl tail were assessed at the air-water and air-deuterium oxide (D2O) interfaces using sum frequency generation vibrational spectroscopy. Remarkably, symmetric and asymmetric N-CH3stretches (at ∼2979 and ∼3045 cm-1, respectively, in the SSP polarization combination) were visible in water but negligible in deuterium oxide. We concluded that D2O addition triggers the average reorientation of the dimethyl amino units parallel to the interface and possibly changes the overall conformation of the surfactant. A reduced number of gauche defects in the surfactant octyl chain is also observed in D2O. Tilt angles for the octyl chain (1.0-10.8°) are consistent with an ordered monolayer at the air-liquid interface.
format Journal
author Uvinduni I. Premadasa
Negar Moradighadi
Kondalarao Kotturi
Jeeranan Nonkumwong
Md Rubel Khan
Marc Singer
Eric Masson
Katherine L.A. Cimatu
author_facet Uvinduni I. Premadasa
Negar Moradighadi
Kondalarao Kotturi
Jeeranan Nonkumwong
Md Rubel Khan
Marc Singer
Eric Masson
Katherine L.A. Cimatu
author_sort Uvinduni I. Premadasa
title Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface
title_short Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface
title_full Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface
title_fullStr Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface
title_full_unstemmed Solvent Isotopic Effects on a Surfactant Headgroup at the Air-Liquid Interface
title_sort solvent isotopic effects on a surfactant headgroup at the air-liquid interface
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049366172&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/58445
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