Cloud point phenomena for POE-type nonionic surfactants in a model room temperature ionic liquid

Inoue, Tohru; Misono, Takeshi

doi:10.1016/j.jcis.2008.04.047

Cited by 46 publications

(52 citation statements)

References 29 publications

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“…Manifestation of clouding behaviour has also been observed for concentrated aqueous salt solutions of certain zwitterionic and ionic surfactants [5][6][7][8][9]. Clouding behaviour of some polyethylene oxide type surfactants in room temperature ionic liquids [10] and acidinduced clouding in anionic surfactants [11] have recently been reported.…”

Section: Introductionmentioning

confidence: 84%

Clouding behaviour in surfactant systems

Mukherjee

Padhan

Dash

et al. 2011

Advances in Colloid and Interface Science

166

109

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Section: Introductionmentioning

confidence: 84%

Clouding behaviour in surfactant systems

Mukherjee

Padhan

Dash

et al. 2011

Advances in Colloid and Interface Science

166

109

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“…The values of viscosity and refractive index of the solution are necessary to derive the particle size from DLS measurements. Instead of the viscosities of the surfactant solution, we used those of pure bmimBF 4 , which were determined previously as a function of temperature [18]; the values in cP are 48.6 (30°C), 32.5 (40°C), and 23.7 (50°C). The refractive index of the solution is not available, and hence, that of water was substituted.…”

Section: Dynamic Light-scattering (Dls) Measurementsmentioning

confidence: 99%

Micelle formation of polyoxyethylene-type nonionic surfactants in bmimBF4 studied by 1H NMR and dynamic light-scattering

Inoue

2009

Journal of Colloid and Interface Science

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“…A partir de las figuras 3a y 3b, es observado un mínimo de la curva de la temperatura en función de la concentración del surfactante, y ese mínimo es llamado de punto de nube o punto crítico de separación de fases (Inoue y Misono, 2008). Eso ocurre porque, arriba del punto de nube, se da la formación de dos fases, una con alta concentración de surfactantes, llamada de coacervado, y otra con baja concentración de surfactantes, llamada fase diluida.…”

Section: Resultados Y Discusiónunclassified

Determinación De Los Parámetros Del Modelo De Flory-Huggins Para Estimación Del Punto De Nube De Surfactantes No Iónicos

et al. 2014

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* autor a quién debe ser dirigida la correspondenciaRecibido Ago. 26, 2013; Aceptado Oct. 9, 2013; Versión final recibida Dic. 1, 2013 Resumen Se ha determinado los puntos de nube de distintos surfactantes polietoxilados y se han caliculado de parámetros termodinámicos como entalpía y entropía de la mezcla utilizando el modelo de Flory-Huggins. Los surfactantes no iónicos son compuestos que pueden ser utilizados como promotores de separación en procesos tales como extracción. Este proceso de separación es basado en un fenómeno químico que ocurre cuando una solución de surfactantes no iónico es sometida al calentamiento, aumentando la temperatura hasta quedar turbia. La temperatura en este momento se denominada punto de nube. La metodología experimental consideró tanto la preparación de soluciones de 0.25 hasta 20% en masa para cada surfactante estudiado y el calentamiento hasta alcanzar el punto de nube. Los parámetros en el modelo de Flory-Huggins fueron obtenidos usando el método de Levenberg-Marquardt y presentan un ajuste satisfactorio a los datos experimentales para todos los surfactantes estudiados en este trabajo. Palabras clave: Levenberg-Marquardt, surfactantes no iónico, Punto de nube, Grado de etoxilación, modelo Flory-Huggins Determination of the Parameters of the Flory-Huggins Model to estimate the Cloud Point of Nonionic Surfactants AbstractThe cloud point of different polyethoxylated surfactants have been experimentally determined and thermodynamic parameters such as enthalpy and entropy of mixing using the Flory-Huggins model have been determined. The non-ionic surfactants are compounds that can be used as separation aid in processes such as extraction. This separation process is based on a chemical phenomenon that occurs when a solution of non-ionic surfactants is subjected to warming, increasing the temperature until getting a turbid liquid. The temperature at this point is known as the cloud point. The experimental methodology considered the preparation of solutions of 0.25 to 20% by mass for each surfactant studied and the heating process until reaching the cloud point. The parameters in the Flory-Huggins model were obtained using the Levenberg-Marquardt method and presented a satisfactory adjustment to the experimental data for all the surfactants studied in this work.

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Cloud point phenomena for POE-type nonionic surfactants in a model room temperature ionic liquid

Cited by 46 publications

References 29 publications

Clouding behaviour in surfactant systems

Clouding behaviour in surfactant systems

Micelle formation of polyoxyethylene-type nonionic surfactants in bmimBF4 studied by 1H NMR and dynamic light-scattering

Determinación De Los Parámetros Del Modelo De Flory-Huggins Para Estimación Del Punto De Nube De Surfactantes No Iónicos

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