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Direct Observation of Adsorption Morphologies of Cationic Surfactants at the Gold Metal–Liquid Interface

https://doi.org/10.1021/acs.jpclett.0c02517

Khan, Md. Rubel; Singh, Himanshu; Sharma, Sumit; Asetre Cimatu, Katherine Leslee (November 2020, The Journal of Physical Chemistry Letters)
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Role of the cationic headgroup to conformational changes undergone by shorter alkyl chain surfactant and water molecules at the air-liquid interface

https://doi.org/10.1016/j.jcis.2020.02.056

Khan, Md. Rubel; Premadasa, Uvinduni I.; Cimatu, Katherine Leslee (May 2020, Journal of Colloid and Interface Science)

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

Premadasa, Uvinduni; Moradighadi, Negar; Kotturi, Kondalarao; Nonkumwong, Jeeranan; Khan, Md. Rubel; Singer, Marc; Masson, Eric; Cimatu, Katherine Leslee (July 2018, Journal of physical chemistry. C)

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 (SFG). Remarkably, symmetric and asymmetric N-CH3 stretches (at ~2979 and ~3045 cm-1, respectively, in the SSP polarization combination) were visible in water but were 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 – 10.8º) are consistent with an ordered monolayer at the air-liquid interface.
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