Effect of electrolytes on surface tension and surface adsorption of 1-hexyl-3-methylimidazolium chloride ionic liquid in aqueous solution

Ghasemian, Ensieh; Najafi, Mojgan; Rafati, Amir Abbas; Felegari, Zahra

doi:10.1016/j.jct.2010.03.007

Cited by 50 publications

(30 citation statements)

References 38 publications

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“…Similar trends were observed when NaBr was added to the dimeric surfactant trimethylene-1,3-bis(dodecyl ammonium bromide (12-3-12) [82]. With the addition of NaBr, a continuous increase in C max and decrease in A min were observed, which is expected for an inorganic electrolyte [68,71]. This may be due to the reduction of repulsive forces between the head groups of the surfactant in the presence of an inorganic electrolyte.…”

Section: Surface Tension Measurementssupporting

confidence: 61%

“…Low values of this parameter indicate efficient packing of monomers at the interface. As reported in Table 3, with the increase in IL concentration up to 0.6 wt%, the C max and A min values increase and decrease, respectively, at ambient conditions [66,71]. The results suggest that, with increasing IL concentration, the effective area per molecule at the interface increases, whereas the minimum area per molecule at the interface decreases to 0.6 wt%, thereafter followed by a reverse trend.…”

Section: Surface Tension Measurementsmentioning

confidence: 53%

“…The addition of NaBr decreased the CMC to 2.30 9 10 -3 molÁdm -3 , which is higher than that in the presence of either IL, which is attributed to the greater surface activity of the ILs compared to NaBr [68]. It is noteworthy that the addition of inorganic salts decreases the CMC of aqueous surfactant solutions [58,[70][71][72][73][74][75][76]. Addition of ILs decreases the thickness of ionic atmosphere surrounding the ionic head groups and consequently decreases the electrostatic repulsion between ionic head groups of surfactants in the micelle, thus decreasing the CMC.…”

Section: Surface Tension Measurementsmentioning

confidence: 91%

“…Comparisons of the results with ILs confirmed the unique behavior of ILs as electrolytes at lower concentration. The CMC values decrease due to the formation of charged ions of the cationic surfactants with the IL's ions, which lowers electrostatic repulsion and favors aggregation [59,[70][71][72][73][74][75][76]. Domanska [77] reported decreases in the CMC value of aqueous CTAB with the addition of ILs such as propyl-(2-hydroxyethyl)-dimethyl-ammonium bromide, butyl-(2-hydroxyethyl)-dimethylammonium bromide, and didecyl-dimethylammonium nitrate.…”

Section: Electrical Conductivity Measurementsmentioning

confidence: 99%

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Effect of [C n mim][Br] Based Ionic Liquids on the Aggregation Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Medium

Vaid

Bhamoria

et al. 2015

J Solution Chem

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In order to gain insight into the role of environmentally benign imidazolium based ionic liquids (ILs) to alter the physicochemical properties of single chain cationic surfactants, we have investigated the effect of 1-hexyl-3-methylimidazolium bromide ([C 6 mim][Br]) and 1-octyl-3-methylimidazolium bromide ([C 8 mim][Br]) on the aggregation behavior of aqueous tetradecyltrimethylammonium bromide (TTAB). The critical micelle concentration (CMC) of TTAB at different concentrations of ILs was determined through conductance, surface tension, spectral change of a dye by UV-Vis measurement, and the pyrene fluorescence probe measurement techniques at 298.15 K. Decreasing of the CMC of aqueous TTAB with increasing ILs concentration proves the micellization is favorable. The effect of ILs on the properties of TTAB was verified by using NaBr. Surface tension measurements complimented by dynamic light scattering (DLS) data revealed the packing density of TTAB aggregates at different concentrations of ILs. The effective area of TTAB molecules at the air/water interface was calculated by the Gibbs adsorption isotherm and found to decrease up to 0.6 wt% of ILs followed by an increase at higher concentration. DLS data revealed an increase in micellar size of TTAB at higher concentration of IL with decrease in the aggregation number (N agg ), determined by the fluorescence quenching method.

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Section: Surface Tension Measurementssupporting

confidence: 61%

Section: Surface Tension Measurementsmentioning

confidence: 53%

Section: Surface Tension Measurementsmentioning

confidence: 91%

Section: Electrical Conductivity Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of [C n mim][Br] Based Ionic Liquids on the Aggregation Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Medium

Vaid

Bhamoria

et al. 2015

J Solution Chem

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“…As a result, the CMC in an aqueous solution with NaI is smaller than that with NaBr or NaCl. Moreover, the ability of sodium halides to reduce CMC values is in the order NaI > NaBr > NaCl (Aswal and Goyal, ; Borwankar and Wasan, ; Dong et al, ; Ghasemian et al, ; Kumar et al, ; Sadeghi and Golabiazar, ; Varade et al, ).…”

Section: Resultsmentioning

confidence: 99%

Effect of Sodium Halide on Micellar and Surface Properties of Cationic Silicone Surfactants

Tan

Shao

Tian

et al. 2018

J Surfact & Detergents

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The effect of sodium halide on aggregation behavior of four cationic silicone surfactants, Si3mamCl, Si4mamCl, Si4PyCl, and Si4minCl, in solution was investigated using surface tension and conductivity measurements. The ability of sodium halide (NaCl, NaBr, and NaI) to reduce critical micelle concentration (CMC) values was in the order NaI > NaBr > NaCl. However, the γCMC values of the cationic silicone surfactants, Si4mamCl, Si4PyCl and Si4minCl, in sodium halide solution are almost the same as those of the salt‐free system. The values of normalΔGm0 and normalΔGads0 are negative, indicating that the micellization process and adsorption of the four cationic silicone surfactants at the air‐solution interface are spontaneous.

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Self‐Assembly of Surface‐Active Ionic Liquids in Aqueous Medium

Rao

Bharmoria

Trivedi

et al. 2015

Ionic Liquid‐Based Surfactant Science

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Effect of electrolytes on surface tension and surface adsorption of 1-hexyl-3-methylimidazolium chloride ionic liquid in aqueous solution

Cited by 50 publications

References 38 publications

Effect of [C n mim][Br] Based Ionic Liquids on the Aggregation Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Medium

Effect of [C n mim][Br] Based Ionic Liquids on the Aggregation Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Medium

Effect of Sodium Halide on Micellar and Surface Properties of Cationic Silicone Surfactants

Self‐Assembly of Surface‐Active Ionic Liquids in Aqueous Medium

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