title: Influence of sodium carboxymethylcellulose on the aggregation behavior of aqueous 1-hexadecyl-3-methylimidazolium chloride solutions.
abstract: The influence of sodium carboxymethylcellulose (NaCMC) on the aggregation phenomena of a surface active ionic liquid 1-hexadecyl-3-methylimidazolium chloride (C16MeImCl) was studied in aqueous solutions using electrical conductivity and surface tension measurements. The counterion condensation behavior of NaCMC (aq) and the premicellar ion-association behavior of C16MeImCl (aq) were also investigated. Two characteristic concentrations, namely the critical aggregation concentration and polymer saturation concentration, before free C16MeImCl micelles appear in C16MeImCl-NaCMC solutions have been identified. Effects of temperature, NaCMC concentration, and the charge density parameter of NaCMC on the self-aggregation of the C16MeImCl have been discussed to elucidate C16MeImCl-NaCMC interactions. The thermodynamic parameters for micellization of C16MeImCl were estimated both in absence and in the presence of NaCMC. The observed enthalpy-entropy compensation effect in C16MeImCl and C16MeImCl-NaCMC systems provided important insight as to how micellization processes are governed by the bulk structural property of the solution with respect to that of the water.
authors.affiliation: Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700 073, India. Electronic address: bijan.chem@presiuniv.ac.in.
authors.forename: Bijan
authors.initials: B
authors.lastname: Das
authors.affiliation: Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700 073, India.
authors.forename: Dhiman
authors.initials: D
authors.lastname: Ray
authors.affiliation: Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro (Oryng-dong), Buk-gu, Gwangju 500-712, Republic of Korea.
authors.forename: Ranjit
authors.initials: R
authors.lastname: De
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000737:chemistry* / Q000378:metabolism*; D007093:Imidazoles / Q000737:chemistry* / Q000378:metabolism*; D012996:Solutions; D013500:Surface Tension; D014961:X-Ray Diffraction
chemical_list: C540044:1-hexadecyl-3-methylimidazolium chloride; D007093:Imidazoles; D012996:Solutions; D002266:Carboxymethylcellulose Sodium
keywords: 1-Hexadecyl-3-methylimidazolium chloride; Aggregation behavior; Enthalpy–entropy compensation effect; Sodium carboxymethylcellulose; Thermodynamics of micellization