Impact of Surface Active Ionic Liquids on the Cloud Points of Nonionic Surfactants and the Formation of Aqueous Micellar Two-Phase Systems
authors Vicente, FA; Cardoso, IS; Sintra, TE; Lemus, J; Marques, EF; Ventura, SPM; Coutinho, JAP
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY B
keywords SODIUM DODECYL-SULFATE; TRITON X-114; PHASE-SEPARATION; CO-SURFACTANTS; EXTRACTION; MIXTURES; BEHAVIOR; WATER; THERMODYNAMICS; SOLUBILIZATION
abstract Aqueous micellar two-phase systems (AMTPS) hold a large potential for cloud point extraction of biomolecules but are yet poorly studied and characterized, with few phase diagrams reported for these systems, hence limiting their use in extraction processes. This work reports a systematic investigation of the effect of different surface-active ionic liquids (SAILs) covering a wide range of molecular properties upon the clouding behavior of three nonionic Tergitol surfactants. Two different effects of the SAILs on the cloud points and mixed micelle size have been observed: ILs with a more hydrophilic character and lower critical packing parameter (CPP < 1/2) lead to the formation of smaller micelles and concomitantly increase the cloud points; in contrast, ILs with a more hydrophobic character and higher CPP (CPP >= 1) induce significant micellar growth and a decrease in the cloud points. The latter effect is particularly interesting and unusual for it was accepted that cloud point reduction is only induced by inorganic salts. The effects of nonionic surfactant concentration, SAIL concentration, pH, and micelle zeta potential are also studied and rationalized.
publisher AMER CHEMICAL SOC
issn 1520-6106
year published 2017
volume 121
issue 37
beginning page 8742
ending page 8755
digital object identifier (doi) 10.1021/acs.jpcb.7b02972
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000411772100012

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