Internal and interfacial structure of small vesicle in aqueous colloid of didodecyldimethylammonium bromide

Matsumoto, T.

doi:10.1007/bf00665994

Cited by 10 publications

(8 citation statements)

References 19 publications

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“…In Figures and , we compare the calculated C 12 C N DABr and C 14 C N DABr cmc values in water with the experimental data − at 25 °C. We use the free energy of the micellization model and molecular parameters provided in the Free Energy of Aggregation section.…”

Section: Resultsmentioning

confidence: 99%

Molecular Thermodynamic Modeling of Droplet-Type Microemulsions

Moreira

Firoozabadi

2012

Langmuir

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Microemulsions are nanoheterogeneous, thermodynamically stable, spontaneously forming mixtures of oil and water by means of surfactants, with or without cosurfactants. The pledge to use small volumes of amphiphile molecules compared to large amounts of bulk phase modifiers in a variety of chemical and industrial processes, from enhanced oil recovery to biotechnology, fosters continuous investigation and an improved understanding of these systems. In this work, we develop a molecular thermodynamic theory for droplet-type microemulsions, both water-in-oil and oil-in-water, and provide the theoretical formulation for three-component microemulsions. Our thermodynamic model, which is based on a direct minimization of the Gibbs free energy of the total system, predicts the structural and compositional features of microemulsions. The predictions are compared with experimental data for droplet size in water-alkane-didodecyl dimethylammonium bromide systems.

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Section: Resultsmentioning

confidence: 99%

Molecular Thermodynamic Modeling of Droplet-Type Microemulsions

Moreira

Firoozabadi

2012

Langmuir

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“…Conductivity data were also studied by the differential conductivity Λ d = 1000∂κ/∂C vs C average , where ∂κ/∂C = 1000(κ 2 − κ 1 )/(C 2 − C 1 ) and C average = (C 2 − C 1 )/2; C 1 and C 2 being two successive total surfactant concentrations whose respective specific conductivities are κ 1 and κ 2 . This representation allows obtaining additional information from conductivity data [23,24].…”

Section: Methodsmentioning

confidence: 99%

The critical micelle concentration of tetraethylammonium perfluorooctylsulfonate in water

López-Fontán

González‐Pérez

Costa

et al. 2006

Journal of Colloid and Interface Science

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“…Spontaneous vesicle formation of a synthetic surfactant – has been an important issues of surfactant sciences since Talmon et al found that of dialkyldimethylammonium hydroxide at higher pH . Israleachivilli suggested that forming a closed bilayer with a finite surfactant molecules from an open planer bilayer with infinite ones is not only energetically but also entropically favorable because water-edge contact of the latter is reduced and one planner bilayer can produce many vesicle particles .…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Vesicle Formation of Mixtures of Double-Chain Cationic Surfactants with a Different Counterion

et al. 2008

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Aggregate formation of a didodecyldimethylammonium bromide (DDAB) and didodecyldimethylammonium chloride (DDAC) mixture in aqueous solution was investigated. The concentration vs composition diagram of aggregate formation was constructed by analyzing the surface tension, turbidity, and electrical conductivity data. The cryogenic transmission electron microscopy was applied to several representative points in the diagram and provided information of the morphology of aggregates. The sequence of monomer (m) - m + small aggregate (A) - m + A + vesicle (V) - m + V was concluded with increasing total concentration of surfactants at all mixing ratios. The compositions of counterions in A and V were estimated on the basis of thermodynamic consideration and examined from the viewpoint of asymmetry of constituents and uneven distribution between outer and inner monolayers of a vesicle bilayer. Vesicle surfaces were suggested to abound in chloride ions compared to bulk solution, which is opposite to spherical micelle surfaces.

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Internal and interfacial structure of small vesicle in aqueous colloid of didodecyldimethylammonium bromide

Cited by 10 publications

References 19 publications

Molecular Thermodynamic Modeling of Droplet-Type Microemulsions

Molecular Thermodynamic Modeling of Droplet-Type Microemulsions

The critical micelle concentration of tetraethylammonium perfluorooctylsulfonate in water

Spontaneous Vesicle Formation of Mixtures of Double-Chain Cationic Surfactants with a Different Counterion

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