Cloud point phenomena of polyoxyethylene-type surfactants in ionic liquid mixtures of emimBF4 and hmimBF4

Inoue, Tohru; Iwasaki, Yasutaka

doi:10.1016/j.jcis.2010.04.089

Cited by 18 publications

(13 citation statements)

References 32 publications

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“…Physicochemical properties of aqueous cationic, anionic, non-ionic and zwitterionic surfactants such as the CMC, size of the aggregates, aggregation number, dipolarity and microfluidity have been systematically modified by adding ILs [21][22][23][24][25][26] 4 ] on the physicochemical properties of aqueous anionic and cationic surfactants [28,29,[36][37][38][39][40]. ILs composed of different cations and anions have been extensively studied by various research groups in the field of colloid and interface science and some extensive reviews are available [41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…It is calculated according to the surfactant concentration. The temperature of the cloud point increases with the increase of the ethoxylation degree for both surfactants (Inoue & Yasutaka, 2010). This can be associated to the greater affinity of the surfactant of the highest ethoxylation degree with water.…”

Section: Results E Discussionmentioning

confidence: 89%

Phenol Estimation Using Flory-Huggins Parameters and Cloud Point of Poliethoxylate Surfactants

Araújo

Silva

Foletto

et al. 2019

BJPG

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This work examines the thermodynamics of phenol extraction by cloud point varying the ethoxylation degrees of nonylphenolpoliethoxylate surfactants (NPEOn) (9.5, 10, 11 and 12). The Flory-Huggins model was applied to estimate enthalpy (ΔH mix) and entropy (ΔS mix) parameters of the mixture, as well as the aggregate number (N). Results show that ΔH mix and ΔS mix values have a direct relationship with the ethoxylation degree of the surfactant used. Differently, aggregate number (N) values have an inverse relationship with the ethoxylation degree. The fitting to the Flory-Huggins model presented a standard deviation (SD) that ranged from 0.161 to 4.037 for each surfactant studied. It was observed that the increase of the phenol concentration in the surfactant + water system resulted in a decrease in the cloud point of the studied surfactants. These results contribute significantly to the application of this type of surfactant in phenol extraction processes.

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“…A visual method was employed for determining the cloud point [6,[11][12][13][14]. In experimental methodology, solutions of 0.5% to 20% by weight of surfactant were prepared.…”

Section: Materials and Proceduresmentioning

confidence: 99%

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Araújo

Neto

Chiavone‐Filho

et al. 2015

Rev. Fac. Ing. Antioquia

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In this study, the influence of NaCl on the cloud point of polyethoxylate surfactants from the family of lauryl alcohol polyethoxylates (C 12 EO n ) and nonylphenol polyethoxylates (NPEO n ) was investigated. Liquid-liquid equilibrium curves of the aforementioned aqueous surfactants system with the presence of NaCl were plotted and thermodynamic parameters based on the Flory-Huggins model were obtained. The visual method was used to determine the cloud point. Solutions containing surfactant concentrations between 0.5 and 20% (by weight) and NaCl between 4.9 and 12.1% (by weight) were prepared. Salt had a salting-out effect, decreasing surfactant solubility in water. Furthermore, the cloud point decreased with an increase of NaCl concentration. The Flory-Huggins model satisfactorily described the experimental data for all surfactant + NaCl aqueous mixtures studied. ---------

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Cloud point phenomena of polyoxyethylene-type surfactants in ionic liquid mixtures of emimBF4 and hmimBF4

Cited by 18 publications

References 32 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

Phenol Estimation Using Flory-Huggins Parameters and Cloud Point of Poliethoxylate Surfactants

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

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