Structure des agrégats inverses d’AOT

Rouvière, J.; Couret, J.-M.; Lindheimer, Arlette; Lindheimer, Marc; Brun, Bernard

doi:10.1051/jcp/1979760297

Cited by 27 publications

(16 citation statements)

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“…In the previous report (11) for a 10°rise in temperature we have observed R w to decrease to the extents of 1, 5, 8, 3, 4, and 8% for CTAB-butanol, SDSbutanol, AOT-butanol, CTAB-hexylamine, SDS-hexylamine, and AOT-hexylamine with 1-heptane as the oil. This, on the whole, agrees with the 20% decrease observed by Rouviere et al (27) for a temperature increase of 23°. In the present study, for a temperature rise of 20°, we have observed a max decrease of 12% in R w for the CPC-pentanol case; for the CPC-butanol system, R w increases instead and maximizes at 4%.…”

Section: Temperature Dependence Of Structural Parameterssupporting

confidence: 92%

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Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C₄and C₅)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Moulik¹,

Aylward²,

Palepu³

2001

Can. J. Chem.

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The microemulsion forming systems of water/cetylpyridinium chloride/butan-1-ol/n-hexane, and water/cetylpyridinium chloride/pentan-1-ol/n-hexane have been studied with respect to their phase behaviours and percolation of conductance to derive information on their droplet physicochemical characteristics (dimension, interfacial area and composition, and number density). This was carried out at different water contents at specific ratios of surfactant and cosurfactant and at various temperatures. From the information collected, the energetics of the transfer of the alkanol (butan-1-ol and pentan-1-ol) from the continuous oil-phase to the interfacial region (the interphase) have been estimated. At the conductance percolation threshold, the droplets cluster or associate, can be considered to form a pseudophase similar to surfactants forming micelles. Based on this concept, the energetics of the clustering process have been evaluated, and the results are discussed in comparison with other recently studied systems.Résumé : Afin de pouvoir déduire des informations sur les caractéristiques physicochimiques de leurs gouttelettes (dimension, surface et composition interfaciales et nombre de densité), on a déterminé les comportements des phases et la percolation de la conductance des systèmes eau/chlorure de cétylpyridinium/butan-1-ol/hexane et eau/chlorure de cétylpyridinium/pentan-1-ol/hexane qui forment des microémulsions. Cette étude a été effectuée à diverses teneurs en eau, à des rapports spécifiques d'agent de surface et de cosurfactant et à diverses températures. À partir des informations recueillies, on a évalué les énergies de transfert des alcools (butan-1-ol et pentan-1-ol) de la phase huileuse continue à la région interfaciale (interphase). Au seuil de percolation de la conductance, on peut considérer que les agrégats de gouttelettes forment une pseudophase semblable à celles des agents de surface qui forment des micelles. En se basant sur ce concept, on a évalué les énergies associées au processus de formation d'agrégats et on discute des résultats par comparaison avec d'autres systèmes étudiés récemment.Mots clés : énergies impliquées dans la formation d'agrégats, percolation, diagrammes de phase, microémulsions et thermodynamique de transfert.[Traduit par la Rédaction] Moulik et al. 12

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Section: Temperature Dependence Of Structural Parameterssupporting

confidence: 92%

“…Both decreased and increased droplet size for AOT stabilized water/oil microemulsions in long chain alkanes as oils have been reported from SANS and TRFQ methods (25)(26)(27). A change in the droplet dimension of 20-35% (decrease or increase) for a temperature range of 25-35°C has been observed.…”

Section: Temperature Dependence Of Structural Parametersmentioning

confidence: 66%

Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C₄and C₅)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Moulik¹,

Aylward²,

Palepu³

2001

Can. J. Chem.

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“…When similar rates of change are compared, eg +0.013 °C s −1 and −0.015 °C s −1 , it is seen that the corresponding delays are 17 °C and 26 °C with respect to the standard PIT, thus resulting in a hysteresis zone extending over 40 °C, a considerable range indeed, which has not previously been reported as far as we know. The unusual occurrence of such hysteresis behaviour may result from the formation of liquid crystals, often of the lamellar type at this surfactant concentration level (5 wt%), that form an onion skin multilayer structure which could be extremely efficient at stabilizing emulsions 28. 29 Liquid crystals are observed in all these systems, and thus could contribute to delaying the inversion of the O/W emulsion by protecting the oil droplets from coalescence when the temperature is elevated.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic connectivity of the rat subiculum: I. Dendritic morphology and patterns of axonal arborization by pyramidal neurons

Harris

Weinstein

Stewart

2001

J of Comparative Neurology

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The dendritic and axonal morphology of rat subicular neurons was studied in single cells labeled with Neurobiotin. Electrophysiological classification of cells as intrinsic burst firing or regular spiking neurons was correlated with morphologic patterns and cell locations. Every cell had dendritic branches that reached the outer molecular layer, with most cells having branches that reached the hippocampal fissure. All but two pyramidal cells had axon collaterals that entered the deep white matter (alveus). Branching patterns of apical dendrites varied as a function of the cell's soma location along the fissure-alveus axis of the cell layer. The first major dendritic branch point for most cells occurred at the superficial edge of the cell layer giving deep cells long primary apical dendrites and superficial cells short or absent primary apical dendrites. In contrast, basal dendritic arbors were similar across cells regardless of cell position. Apical and basal dendrites of all cells had numerous spines. Superficial and deep cells also differed in axonal collateralization. Deep cells (mostly intrinsically bursting [IB] class) had one or more ascending axon collaterals that typically remained within the region circumscribed by their apical dendrites. Superficial cells (mostly regular spiking [RS] class) tended to have axon collaterals that reached longer distances in the cell layer. Numerous varicosities and axonal extensions were present on axon collaterals in the cell layer and in the apical dendritic region, suggesting intrinsic connectivity. Axonal varicosities and extensions were found on axons that entered presubiculum, entorhinal cortex or CA1, supporting the notion that these were projection cells. Local collaterals were distinctly thinner than collaterals that would leave the subiculum, suggesting little or no myelin on local collaterals and some myelin on efferent fibers. We conclude that both IB and RS classes of subicular principal cells make synaptic contacts in and apical to the cell layer. Based on the patterns of axonal arborization, we suggest that subiculum has at least a crude columnar and laminar architecture, with ascending collaterals of deep cells forming columns and broader axonal arbors of superficial cells serving to distribute activity across multiple columns.

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“…Several authors have investigated the energetic state of water in reversed micelles by calorimetry [45][46][47][48][49][50]. There has been some controversy over the number of types of water encapsulated within reversed micelles and the appropriate model to describe the distribution among them.…”

Section: Reversed Micelles As Nanocontainers: the State Of Water mentioning

confidence: 99%

Calorimetric Investigations of Solutions of Reversed Micelles

Garti¹

2000

Surfactant Science

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Structure des agrégats inverses d’AOT

Cited by 27 publications

References 0 publications

Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C₄and C₅)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C₄and C₅)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Intrinsic connectivity of the rat subiculum: I. Dendritic morphology and patterns of axonal arborization by pyramidal neurons

Calorimetric Investigations of Solutions of Reversed Micelles

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Structure des agrégats inverses d’AOT

Cited by 27 publications

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Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C4and C5)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C4and C5)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Intrinsic connectivity of the rat subiculum: I. Dendritic morphology and patterns of axonal arborization by pyramidal neurons

Calorimetric Investigations of Solutions of Reversed Micelles

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Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C₄and C₅)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics

Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C₄and C₅)/1-hexane water/oil microemulsions with reference to their structure and related thermodynamics