Surfactant Adsorption at the Surface of Mixed Ionic Liquids and Ionic Liquid Water Mixtures | Zendy

Deborah Wakeham | Zendy; Gregory G. Warr | Zendy; Rob Atkin | Zendy

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Surfactant Adsorption at the Surface of Mixed Ionic Liquids and Ionic Liquid Water Mixtures

Author(s) -

Deborah Wakeham,

Gregory G. Warr,

Rob Atkin

Publication year - 2012

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la302184h

Subject(s) - chemistry , pulmonary surfactant , solvent , adsorption , ethylene oxide , micelle , solvation , ionic liquid , critical micelle concentration , ethylene glycol , inorganic chemistry , ionic bonding , solvophobic , gibbs isotherm , surface tension , chemical engineering , organic chemistry , ion , aqueous solution , thermodynamics , biochemistry , physics , engineering , copolymer , catalysis , polymer

Surface tensiometry and neutron reflectivity have been used to elucidate the structure of the adsorbed layer of nonionic surfactant tetraethylene glycol tetradecyl ether (C(14)E(4)) at the free surface of the ionic liquids ethylammonium nitrate (EAN) and ethanolammonium nitrate (EtAN) and their binary mixtures with each other and with water. Surface tensions reveal that the critical micelle concentration (cmc) depends strongly on solvent composition. The adsorbed surfactant structure elucidated by neutron reflectivity shows that the level of solvation of the ethylene oxide groups varies for both the pure and mixed solvents. This is attributed to solvent-solvent interactions dominating solvent-surfactant interactions.

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