Structure and Properties of Three-Component Microemulsions Near the Critical Point

Huang, J. S.; Kotlarchyk, Michael; Chen, S.-H.

doi:10.1007/978-1-4613-8938-5_13

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…The w value of 3.0 has to be the lower limit, considering the size of DASPI. The upper limit of the water pool size ( w = 27.8) was chosen because the spherical shape could be destroyed at the higher water pool size . It is seen that the absorption peak and the bandwidth increase with increasing micelle size.…”

Section: Resultsmentioning

confidence: 99%

Excited-State Photophysics and Dynamics of a Hemicyanine Dye in AOT Reverse Micelles

Kim

Lee

1999

J. Phys. Chem. A

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The internal rotation of a photoexcited hemicyanine dye, trans-4-[4-(dimethylamino)-styryl]-1-methylpyridinium iodide (DASPI), was investigated in water-containing reverse micelles. The rate constants for the twisting motion were obtained from the measured fluorescence lifetimes in various sizes of water nanoclusters (ca. 0.6−5.6 nm in radius) prepared from sodium bis(2-ethylhexyl) sulfosuccinate (AOT)−alkane−water solutions by changing the molar ratio of water/AOT. It was observed that the fluorescence lifetime of DASPI in the water pool formed by the reverse micelle markedly increases as the nanocluster size decreases, implying that the excited-state twisting motion is significantly influenced by the microstructure of the reverse micelle. An endeavor was made to relate the rate process for internal rotation to water pool characteristics such as polarity and viscosity.

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Section: Resultsmentioning

confidence: 99%

Excited-State Photophysics and Dynamics of a Hemicyanine Dye in AOT Reverse Micelles

Kim

Lee

1999

J. Phys. Chem. A

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“…For w/o microemulsion droplets stabilised by the anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate (AOT), a large number of studies have shown that these droplets retain a constant droplet size but become increasingly attractive on moving away from the SPB (see, for example, ref. 12,13). For this particular system, crossing the haze boundary yields phase separation into coexisting droplet-rich and droplet-lean phases for which the droplet size is the same as in the original single-phase microemulsion.12 This type of phase separation is driven by increasing attractive interactions.…”

Section: Temperature E †Ects On Single-phase Microemulsionsmentioning

confidence: 97%

A model for the temperature-dependent interactions in uncharged droplet microemulsions

Fletcher¹,

Petsev²

1997

Faraday Trans.

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“…The structure and dynamics of water-in-oil droplets in single-phase ternary microemulsions are well understood [1,2]. In the system containing the surfactant AOT (sodium di-2ethylhexylsulfosuccinate), the mean droplet core radius (≈50 Å) increases linearly with the water-to-surfactant molar ratio, W , and maintains this size independently of oil dilution, up to very high values of the total droplet volume fraction φ [3,4].…”

Section: Introductionmentioning

confidence: 99%

Isomeric and concentration effects of C₄-cosurfactants on four-component microemulsions investigated by neutron spin-echo and small-angle scattering

Zambrano¹,

Kotlarchyk²,

Langner³

et al. 2006

J. Phys.: Condens. Matter

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Neutron spin-echo spectroscopy and small-angle scattering measurements were performed to determine how the isomeric structure and concentration of C4-cosurfactants (i.e. butyl alcohols) influence structure and dynamics in four-component water-in-oil microemulsions. The system investigated was AOT/butanol/water/n-octane at room temperature (AOT denotes sodium di-2-ethyl hexylsulfosuccinate), deuterated to achieve contrast of the surfactant/cosurfactant film. At a fixed volume fraction of 0.06 and a fixed molar ratio of [water]/[AOT] = 20, we studied the effects of increasing the molar ratio of [butanol]/[AOT] from 0 to 30. Data from samples containing the cosurfactant n-butyl alcohol were compared with samples prepared with tert-butyl alcohol and, in a few cases, sec-butyl alcohol. Data were analysed using a core–shell model for polydisperse spherical droplets, allowing for the presence of shape fluctuations. It was found that all structural isomers of the cosurfactant led to a similar decrease in droplet size with increasing alcohol content. In all cases, droplet size and shape fluctuations were observed to increase with alcohol content; however, the effect was most pronounced for size fluctuations (i.e. polydispersity) in the presence of tert-butanol. The data indicates that tert-butanol has a higher degree of penetration into the water core, leading to a reduced influence on the effective area per surfactant head group on the droplet surface. There is also evidence that an increased droplet–droplet attraction upon adding tert-butanol drives phase separation in the system.

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Structure and Properties of Three-Component Microemulsions Near the Critical Point

Cited by 5 publications

References 39 publications

Excited-State Photophysics and Dynamics of a Hemicyanine Dye in AOT Reverse Micelles

Excited-State Photophysics and Dynamics of a Hemicyanine Dye in AOT Reverse Micelles

A model for the temperature-dependent interactions in uncharged droplet microemulsions

Isomeric and concentration effects of C₄-cosurfactants on four-component microemulsions investigated by neutron spin-echo and small-angle scattering

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Structure and Properties of Three-Component Microemulsions Near the Critical Point

Cited by 5 publications

References 39 publications

Excited-State Photophysics and Dynamics of a Hemicyanine Dye in AOT Reverse Micelles

Excited-State Photophysics and Dynamics of a Hemicyanine Dye in AOT Reverse Micelles

A model for the temperature-dependent interactions in uncharged droplet microemulsions

Isomeric and concentration effects of C4-cosurfactants on four-component microemulsions investigated by neutron spin-echo and small-angle scattering

Contact Info

Product

Resources

About

Isomeric and concentration effects of C₄-cosurfactants on four-component microemulsions investigated by neutron spin-echo and small-angle scattering