Composition, Properties and Structures of Liquid Crystalline Phases in Systems of Amphiphilic Compounds

Ekwall, Per

doi:10.1016/b978-0-12-025001-1.50007-x

Cited by 383 publications

(87 citation statements)

References 114 publications

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“…The interaction between asymmetric head groups is small and almost no differences are observed in the phase diagrams of racemate and optically-active systems. Addition of a small concentration of decanol reduces the a s ' of the surfactant (49) (Fig. 17).…”

Section: Comparison Of Ternary Phase Diagramsmentioning

confidence: 99%

Phase Behavior and Effect of Enantiomerism on Potassium N -Dodecanoyl Alaninate/Water/Decanol Systems

Acharya¹,

López‐Quintela²,

Kunieda³

et al. 2003

J. Oleo Sci.

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Section: Comparison Of Ternary Phase Diagramsmentioning

confidence: 99%

Phase Behavior and Effect of Enantiomerism on Potassium N -Dodecanoyl Alaninate/Water/Decanol Systems

Acharya¹,

López‐Quintela²,

Kunieda³

et al. 2003

J. Oleo Sci.

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“…Long hydrocarbon tails favour the formation of viscous liquid crystalline phases rather than the formation of microemulsions. 100 Therefore, ionic surfactants do not form microemulsions without the addition of at least a fourth component namely a cosurfactant such as alcohols.…”

Section: Microemulsions With Ionic Surfactantsmentioning

confidence: 99%

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Zech¹,

Thomaier²,

Kolodziejski³

et al. 2010

Chemistry A European J

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“…Desde un punto de vista estructural, han sido bastantes los estudios realizados sobre los diagramas de fases de los sistemas formados por un alquilfenol polietoxilado y agua como componentes (Ekwall, 1975;Soltero y col., 1995;Muñoz y col., 1991;Montalvo y col., 1995). Sin embargo, pocos estudios se han realizado sobre el comportamiento reológico de dichos sistemas, tan importante en multitud de fenómenos físicos y de interés industrial.…”

Section: Introduccionunclassified

Linear viscoelasticity of liquid crystalline phases for a ethoxylated nonylphenol nonionic surfactant/water system

Cordobés¹,

Moros²,

Franco³

et al. 2002

Grasas y Aceites

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RESUMEN Viscoelasticidad lineal de estructuras líquido-cristalinas de un sistema tensioactivo no iónico nonilfenol etoxilado/agua.En el presente trabajo se ha estudiado el comportamiento viscoelástico lineal de las fases micelares y líquido-cristalinas presentes en el diagrama de fases del sistema aducto de nonilfenol con diez moles de óxido de etileno (NPFE-10) y agua. Con este propósito se efectuaron ensayos en cizalla oscilatoria no destructivos dentro del intervalo de viscoelasticidad lineal. Las funciones viscoelásticas obtenidas para las fases micelar y hexagonal pueden describirse satisfactoriamente mediante modelos de Maxwell simple y generalizado, respectivamente. El comportamiento viscoelástico lineal de la fase laminar es el típico de fluidos altamente estructurados, obteniéndose una zona plateau en el intervalo de frecuencias estudiado. Por otra parte, de los resultados experimentales se deduce que los ensayos viscoelásticos lineales constituyen un método eficaz a la hora de d e t e r m i n a r l a s t r a n s i c i o n e s d e f a s e s m i c e l a r e s y / o líquido-cristalinas. PALABRAS-CLAVE: Cristal líquido liotrópico -Modelo deMaxwell -Nonilfenol etoxilado -Tensioactivo no iónico -Viscoelasticidad lineal. SUMMARY Linear viscoelasticity of liquid crystalline phases for a ethoxylated nonylphenol nonionic surfactant/water system.In this work the linear viscoelastic behaviour of micelar and liquid-crystalline phases in a polyoxy-ethylene glycol nonylphenyl ether (EOa=10)/water system was studied. A linear viscoelastic characterization using small amplitude oscillatory tests was carried out. The Maxwell and Generalized Maxwell models fit the linear viscoelastic functions of micellar and hexagonal phases respectively, fairly well. On the other hand, the lamellar phase shows a plateau region characteristic of highly structured systems. As may be deduced from the experimental results, dynamic measurements constitute an effective method to study the structural changes occurring in phase diagrams.

show abstract

Composition, Properties and Structures of Liquid Crystalline Phases in Systems of Amphiphilic Compounds

Cited by 383 publications

References 114 publications

Phase Behavior and Effect of Enantiomerism on Potassium N -Dodecanoyl Alaninate/Water/Decanol Systems

Phase Behavior and Effect of Enantiomerism on Potassium N -Dodecanoyl Alaninate/Water/Decanol Systems

Ionic Liquids in Microemulsions—A Concept To Extend the Conventional Thermal Stability Range of Microemulsions

Linear viscoelasticity of liquid crystalline phases for a ethoxylated nonylphenol nonionic surfactant/water system

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