Lower consolute boundaries of the nonionic surfactant C8E5 in aqueous alkali halide solutions: An approach to reproduce the effects of alkali halides on the cloud-point temperature

Weckström, Kristian; Papageorgiou, Anastassios C.

doi:10.1016/j.jcis.2007.01.045

Cited by 23 publications

(15 citation statements)

References 78 publications

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“…It was found that the phase separation temperature decreases in the order I > NO 3 > Cl ≈ Br-. This is in agreement with Hofmeister's series in terms of amphiphile solubility; the same trend has been observed for aqueous solutions of thermoresponsive polymers 36,37) . It is interesting to note that the temperature dependence of viscosity shows different trend depending upon the nature of anion species present in the systems.…”

Section: Thermoresponsive Behaviorsupporting

confidence: 90%

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Shrestha¹,

Rodríguez‐Abreu²,

Aramaki³

2009

J. Oleo Sci.

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Section: Thermoresponsive Behaviorsupporting

confidence: 90%

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Shrestha¹,

Rodríguez‐Abreu²,

Aramaki³

2009

J. Oleo Sci.

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“…[15][16][17]. These results corroborate the evidence given by other researchers [18,19]. The diminishing cloud point phenomenon is caused by the salting-out effect, which produces a decrease in surfactant solubilization in water.…”

Section: Flory-huggins Modelsupporting

confidence: 91%

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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“…A decrease in P 0 results in an increase of the cloud point temperature. In contrast hereto, kosmotropic ions will amplify the dehydration of the EO groups (Weckström and Papageorgiou, ). Therefore, the slope of decrease of v eff (cf.…”

Section: Discussionmentioning

confidence: 99%

“…The required additional ingredient is the lateral equation of state of the headgroup (Bauduin and Zemb, 2014). Chaotropic ions will preferentially adsorb at the polar interface and, therefore, increase a I , while decreasing P 0 (Buchecker et al, 2018;Weckström and Papageorgiou, 2007). A decrease in P 0 results in an increase of the cloud point temperature.…”

Section: Discussionmentioning

confidence: 99%

Understanding and Prediction of the Clouding Phenomenon by Spontaneous and Effective Packing Concepts

Pleines

Kunz

Zemb

2019

J Surfact & Detergents

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In this work, we show by which mechanism branching of the hydrocarbon chains influences the cloud point of nonionic, ethoxylated surfactants. The temperature‐induced separation into a dilute and a concentrated liquid phase is of liquid–gas type and can be explained by the relative probability of endcaps and branching points of the cylindrical micelles in both phases. The influence of branches on the hydrocarbon chains can be easily understood by means of spontaneous and effective packing concepts, while quantification via hydrophilic/lipophilic balance (HLB), hydrophilic‐lipophilic difference (HLD), and HLD‐Net Average Curvature requires parametrization. The phase equilibrium above the cloud point phenomenon is equivalent to the Winsor I type phase equilibrium, one of the five known phase equilibria in ternary systems.

show abstract

Lower consolute boundaries of the nonionic surfactant C8E5 in aqueous alkali halide solutions: An approach to reproduce the effects of alkali halides on the cloud-point temperature

Cited by 23 publications

References 78 publications

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

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

Understanding and Prediction of the Clouding Phenomenon by Spontaneous and Effective Packing Concepts

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