Nematic and Disrupted Lamellar Phases in Cesium Pentadecafluorooctanoate/2H2O: A Small Angle Scattering Study

Holmes, Michael C.; Leaver, M. S.; Smith, Andrew M.

doi:10.1021/la00001a058

Cited by 63 publications

(74 citation statements)

References 1 publication

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“…Israelachvili [15] proposed that if an electrolyte is added to isotropic micellar solutions, the micelles grow as a result of screening of the repulsions between the head groups at the micelle surface. Similar results were reported by Holmes et al [16] and Leaver et al [17] for cesium perfluorooctanote (CsPFO)/water system, which exhibited a lyotropic nematic phase at certain temperature range. They showed that the micelles of the nematic phase of CsPFO/water mixture grow by the addition of cesium chloride (CsCl) into this mixture.…”

Section: Hofmeister Anions In Micellar Systemssupporting

confidence: 87%

Effect of Hofmeister anions on the existence of the biaxial nematic phase in lyotropic mixtures of dodecyltrimethylammonium bromide/sodium salt/1-dodecanol/water

2015

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Lyotropic mixtures including different sodium salts of Hofmeister anions were studied in order to investigate the effect of these anions on the existence of biaxial nematic phase and on the uniaxial to biaxial phase transitions. For this purpose, these sodium salts were added singly into different mixtures of dodecyltrimethylammonium bromide (DDTMABr)/1-dodecanol/water, keeping the relative molar concentration of all the constituents constant. The uniaxial to biaxial phase transitions were determined from the temperature dependence of the birefringences by laser conoscopy. Micellar shape anisometry and average micellar volume were evaluated from small-angle X-ray scattering measurements. The results indicated that the Hofmeister anions were bounded to the head groups of DDTMABr molecules at the micelles' surfaces, which significantly affect the different orientational fluctuations responsible for the formation of different nematic phases, biaxial phase domains and uniaxial to biaxial phase transition temperatures.

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Section: Hofmeister Anions In Micellar Systemssupporting

confidence: 87%

Effect of Hofmeister anions on the existence of the biaxial nematic phase in lyotropic mixtures of dodecyltrimethylammonium bromide/sodium salt/1-dodecanol/water

2015

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“…There are several reports (39) of defected or disrupted lamellar (L a H ) phase in surfactant-water binary systems of ionic surfactants, viz., sodium dodecyl sulphate (40), lithium perfluorooctanoate (41) and cesium pentadecafluorooctanoate (37,42), and long-chain poly (oxyethylene) surfactants (36,(43)(44)(45)(46). However, we are not aware of any report of the L a H phase between the H 1 or R 1 and the L a phase in ternary systems, except that reported by Kekicheff et al in the SDS/water/decanol system (40).…”

Section: Phase Transformation Along Line Bmentioning

confidence: 95%

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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“…19,20 Besides cylindrical micelles and planar bilayer structures more complex morphologies such as branched cylindrical micelles, rings, perforated bilayer vesicles, and mesh phases have been reported. [21][22][23][24][25][26][27] In particular, the morphologies with non-constant interfacial curvatures (bicontinuous phases) are interesting at a fundamental level in order to understand why they form. 28,29 Fluorinated amphiphiles are also interesting for applications.…”

Section: Introductionmentioning

confidence: 99%

Controlled self-assembly of stomatosomes by use of single-component fluorinated dendritic amphiphiles

et al. 2018

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A series of novel non-ionic amphiphiles with dendritic oligoglycerol head groups of different generations ([G1]-[G3]) and lipophilic/fluorophilic tail segments, comprising single or double tail alkyl chains, C8F17-perfluoro rod segments as well as flexible spacer groups of different lengths were designed and synthesized. We expected that the differences in the size of the dendritic head groups in combination with perfluorinated segments would have an impact on the supramolecular structures formed in aqueous solution if compared with the hydrogenated analogues. Investigating the self-assembly behavior mainly by cryogenic transmission electron microscopy (cryo-TEM) and cryo-electron tomography (cryo-ET) we found as a new result the formation of perforated bilayer vesicles (stomatosomes) and bicontinuous network structures. Surprisingly, we have observed stomatosome formation by self-assembly of single component fluorinated dendritic amphiphiles. These assembly structures turned out to be extremely robust against harsh conditions, although there are strong indications that they represent non-equilibrium structures, which eventually transform into a bicontinuous cubic network structure of double diamond symmetry. In general, the molecular asymmetry of amphiphiles tuned by chemical design induced the expected trend from spherical micelles through worm-like micelles to perforated bilayers and three-dimensional network structures.

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Nematic and Disrupted Lamellar Phases in Cesium Pentadecafluorooctanoate/2H2O: A Small Angle Scattering Study

Cited by 63 publications

References 1 publication

Effect of Hofmeister anions on the existence of the biaxial nematic phase in lyotropic mixtures of dodecyltrimethylammonium bromide/sodium salt/1-dodecanol/water

Effect of Hofmeister anions on the existence of the biaxial nematic phase in lyotropic mixtures of dodecyltrimethylammonium bromide/sodium salt/1-dodecanol/water

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

Controlled self-assembly of stomatosomes by use of single-component fluorinated dendritic amphiphiles

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