Structures in Mixtures of p‐tert‐Octylphenol Polyoxyethylene and Water. 1. Triton X‐114

Heusch, R.; Köpp, F.

doi:10.1002/bbpc.19870910809

Cited by 18 publications

(15 citation statements)

References 25 publications

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“…MLVs) with random orientation. 50 This type of microstructures was already observed through polarized microscopy and transmission electron microscopy in several non-ionic surfactants water solutions 51 and we previously 18 showed the same polycrystalline microstructure for the HLAS surfactant as well. Interestingly, an internal microstructure made by dispersed L domains has been reported at a concentration even lower than 5%.…”

Section: Rheological Resultssupporting

confidence: 67%

Dynamic behaviour of multilamellar vesicles under Poiseuille flow

et al. 2017

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Section: Rheological Resultssupporting

confidence: 67%

Dynamic behaviour of multilamellar vesicles under Poiseuille flow

et al. 2017

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“…In other words, the polydomain lamellar microstructure is formed by connected liquid crystalline monodomains with random orientation so that from a macroscopic point of view it looks disoriented and with structural defects (Barnes, 1980). The technique of freeze-fracture transmission electron microscopy provides clear pictures supporting the microstructure above described Kopp, 1987 and, (Jousma et al, 1987).…”

Section: Structure Of Lamellar Liquid Crystals (L α α )mentioning

confidence: 63%

Rheological and phase behaviour of amphiphilic lipids

Muñoz

Alfaro

2000

Grasas y Aceites

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RESUMEN Comportamiento reológico y de fase de lípidos anfifílicosEn este capítulo se realiza una revisión de las distintas estructuras coloidales de asociación que pueden formar los lípidos anfifílicos en estado líquido-cristalino y de sus correspondientes propiedades de flujo en cizalla. Se describe la estructura y comportamiento reológico de cristales líquidos termotrópicos, con énfasis en los de tipo esméctico, fases gel, y cristales líquidos liotrópicos: nemáticos, laminares, laminares diluidos, dispersiones de laminares, hexagonales y cúbicos. Se hace hincapié en la importancia de una buena caracterización reológica y reo-óptica de cara a sus aplicaciones prácticas, desarrollo de formulaciones y como una técnica útil para determinar diagramas de fases y detectar cambios de estructura. Se ha usado una metodología histórica para analizar la evolución de la caracterización reológica e identificación de las diferentes estructuras líquido-cristalinas y estructuras afines. La interpretación de comportamientos de flujo viscoso no newtonianos, fenómenos tixotrópicos y antitixotrópicos y de las propiedades viscoelásticas lineales, determinadas con ensayos dinámicos y de fluencia, y no lineales, descritas mediante la diferencia de esfuerzos normales y ensayos de relajación del esfuerzo, se basa en la interrelación microestructuracomportamiento reológico. La naturaleza policristalina de los cristales líquidos resulta ser muy sensible a la cizalla, debido al cambio de tamaño y orientación de los dominios líquido-cristalinos mientras fluyen. PALABRAS-CLAVE: Comportamiento de fase Comportamiento reológico Lípidos anfifílicos. SUMMARY Rheological and phase behaviour of amphiphilic lipidsThis chapter reviews the different association structures which are likely to be formed by amphiphilic lipids in the liquid-crystalline state and their corresponding shear flow properties. The structure and rheological behaviour of thermotropic liquid crystals, emphasizing the properties of smectic mesophases, and those of lyotropic liquid crystals such as: nematic, lamellar, diluted lamellar, lamellar dispersions, hexagonal and cubic mesophases are described. The importance of a comprehensive rheological characterisation, including rheo-optical techniques, is pointed out for their practical applications, development of formulations and as a useful technique to assist in the determination of phase diagrams. A historical approach has been used to discuss the evolving field of the rheology and structure identification of liquid crystals formed by amphiphilic lipids and surfactants. Non-Newtonian viscous shear flow, thixotropic and antithixotropic phenomena, linear viscoelastic properties -described by dynamic and creep compliance experiments-and non-linear viscoelastic properties -described by the difference of normal stresses and stress relaxation tests are interpreted on the basis of a microstructure-rheology relationship. The polycrystalline nature of liquid crystals turns out to be rather sensitive to shear due to the change of both size...

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“…The transition from the mesophase to the isotropic aqueous solution is observed at certain non-ionic surfactant concentrations and temperatures [1][2][3][4][5][6][7][8][9]14,15]. The shape of micelles changes near the border between the areas of the mesophases, the optically isotropic aqueous 0022 solution and the phases separated in the miscibility gap.…”

Section: Introductionmentioning

confidence: 99%

“…Their structures depend on aggregation numbers n aggr and hydration numbers Z of non-ionic surfactant molecules. The parameter Z characterizes the number of water molecules bound by intermolecular hydrogen bonds with one ether oxygen atom of the poly(ethylene oxide) chain of non-ionic surfactant molecules [2][3][4][5][6][7]11].…”

Section: Introductionmentioning

confidence: 99%

“…The study of phase diagrams of aqueous binary solutions of non-ionic surfactants demonstrated [1][2][3][4][5][6][7][8][9][10][11] that, depending on the concentration and temperature, either optically isotropic solutions or lyotropic liquid crystal mesophases are observed. Their structures depend on aggregation numbers n aggr and hydration numbers Z of non-ionic surfactant molecules.…”

Section: Introductionmentioning

confidence: 99%

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