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Effects of 1‐Alkyl‐(and 1‐Benzyl)‐2,3‐Dimethylimidazolium Ionic Liquids as Additives on the Micellar Behavior of Surfactant SB‐12
Author(s) -
Pal Amalendu,
Pillania Ankita
Publication year - 2019
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1002/jsde.12224
Subject(s) - chemistry , bromide , pulmonary surfactant , aqueous solution , ionic liquid , surface tension , critical micelle concentration , alkyl , micelle , inorganic chemistry , chloride , adsorption , aggregation number , micellar solutions , ionic bonding , organic chemistry , ion , catalysis , biochemistry , physics , quantum mechanics
The micellization and surface‐active behavior of zwitterionic surfactant N‐dodecyl‐N,N‐dimethyl‐3‐ammonio‐1‐propanesulfonate (SB‐12) in aqueous media were investigated in the absence and presence of different alkyl‐appended and benzyl‐appended ionic liquids (IL) 1‐butyl‐2,3‐dimethylimidazolium chloride [bdmim][Cl], 1‐butyl‐2,3‐dimethylimidazolium bromide [bdmim][Br], 1‐hexyl‐2,3‐dimethylimidazolium bromide [hdmim][Br], and 1‐benzyl‐2,3‐dimethylimidazolium chloride [bzdmim][Cl]. The characteristics of self‐organization processes in SB‐12 + IL/water systems include critical micelle concentration (cmc), aggregation number ( N agg ), micellar size (D), surface, and adsorption parameters. These parameters were determined by the fluorescence and surface tension measurements. In SB‐12 solutions, cmc were found to be decreasing to different extents in the presence of all the studied IL than in pure water. The addition of IL [hdmim][Br] decreases the cmc of aqueous SB‐12 to rather a low extent. The other three IL show a prominent lowering in cmc of surfactant SB‐12 to different magnitude. The maximum lowering in cmc was observed due to addition of benzyl‐appended IL [bzdmim][Cl]. The aggregation number of aqueous SB‐12 solution obtained in general is higher at high wt.% of added IL. The average micellar size was also found to increase upon addition of IL. Both IL anions and cations interacted with the charged centers present on the zwitterionic surfactant SB‐12, which caused a substantial increase in the surface activity.