Aggregation Behavior of Task‐Specific Acidic Ionic Liquid N‐Methyl‐2‐Pyrrolidinium Dihydrogen Phosphate [NMP][H₂PO₄] in Aqueous and Aqueous Salt Solutions

Abstract

The effect of alkali salt (NaCl, NaBr, and KCl) addition on aggregate formation of N‐methyl‐2‐pyrrolidinium dihydrogen phosphate [NMP][H2PO4] ionic liquid in aqueous solution was determined using surface tension at 298.15K and conductance from 288.15 to 308.15K. The surface parameters such as critical aggregation concentration (CAC), adsorption efficiency, surface pressure, surface tension at CAC, minimum surface cover by a single molecule, and maximum area excess concentration were calculated from surface tension measurements with and without salts. The results show that [NMP][H2PO4] forms aggregates at lower concentrations and is more surface active than classical cationic surfactants.

Scrutinizing Self-Assembly, Surface Activity and Aggregation Behavior of Mixtures of Imidazolium Based Ionic Liquids and Surfactants: A Comprehensive Review

“…where V 0 signifies the volume occupied by the hydrophobic group in the core of the micelle, l c denotes the length of the hydrophobic core. The value of V 0 and l c can be calculated by employing Tanford's formulas given below (Tanford, 1980 ; Mata et al, 2004 ; Zhao et al, 2017 ; Pal and Saini, 2019 ).…”

Theoretical Approaches on the Synergistic Interaction between Double‐Headed Anionic Amino Acid‐Based Surfactants and Hexadecyltrimethylammonium Bromide

“…S1) (Barai et al, 2019). The trend can be explained by C 12 MalNa 2 being less bulky and hydrophilic than the other two AAS due to the absence of methylene group between two carboxylate anions, thereby enabling C 12 MalNa 2 to more strongly interact with HTAB and remain associated with the micellar surface (Pal and Saini, 2019). The stronger interaction between C 12 MalNa 2 and HTAB are also reflected by lower β σ values (Table S1) (Huang and Ren, 2019;Ren, 2015;Ren et al, 2016;Ren et al, 2017aRen et al, , 2017bRen et al, 2018).…”

Interfacial and Aggregation Behaviour of Sodium Dodecyl Sulphate Induced by Ionic Liquids

“…Aggregation number of SDS n in water and as well as in IL W mixed solvent systems were determined using Py as probe and HPC as quencher Q using the following equation 43,46,60,61 :…”

“…3, panel A also summarized in Table 1, along with other results . Increased aggregation number of SDS in IL W mixed solvent systems compared to pure water are due to the presence of ionic liquid molecules in water which increases the polarity of the mixed systems; also it is known that the micellar aggregation number increases with increasing salt concentration 43,46,60,61 . Almost two fold increases in micellar aggregation number in presence of ionic liquids are due to the formation of mixed micelles between the dodecyl sulphate anion and ionic liquid cations that interact favourably through electrostatic attraction.…”

“…Higher hydrophilicity of imidazolium or pyrrolidinium groups with SDS are quite different than that of the aggregation of mixed micelles, so using such surfactant with multitude of such ionic liquids are considered to be very important 42 . Studies were carried out by surface tension, electrical conductance, UV-VIS absorption and emission spectroscopy, and dynamic light scattering DLS studies 6,40,43 . Critical micelle concentration CMC , surface pressure at CMC π CMC and Gibbs free energy change for micellization ΔG 0 mic values were obtained from surface tension data 7 .…”