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  • 1
    Electronic Resource
    Electronic Resource
    Pressure-induced phase transition from disordered microemulsion to lamellar structure in a water/AOT/n-decane system (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 86-90 
    Details
    ISSN: 1435-1536
    Keywords: Neutron scattering ; microemulsion ; lamellar structure ; first-order phase transition ; high pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Pressure effect on the structure of a 3-component micro-emulsion AOT/water/n-decane was investigated by means of small-angle neutron scattering. The measured pressure range was from 0.1 (1 atm) to 83.5 MPa. The present sample was at the composition of the molar ratio of [water]/[AOT]=40.8 and the volume fraction of both water and AOT against the whole volume 0.6. A phase transition from disordered microemulsion to ordered lamellar structure was observed at about 50 MPa through a coexisting region. The pressure dependence of the repeat distance and the correlation length in both high- and low-pressure phases was calculated from the scattering profiles by fitting to Teubner and Strey's formula and/or a single Gaussian. The low-pressure phase became more disordered with increasing pressure and then the phase transition to the ordered phase occurred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189498
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  • 2
    Electronic Resource
    Electronic Resource
    Structural changes and interaction parameters in amphiphilic system C12E5/water/n-octane (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 91-97 
    Details
    ISSN: 1435-1536
    Keywords: Interaction parameter ; lamella ; microemulsion ; structure ; parameter ; spin-lattice model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A ternary amphiphilic system consisting of water,n-octane and nonionic amphiphile C12E5 has been studied by means of small-angle X-ray scattering in order to understand the differences of structures and interaction parameters among the low-temperature microemulsion (LTM), middle-temperature lamellar (MTL) and high-temperature microemulsion (HTM) phases. Scattering spectra for microemulsion phases are analyzed by the phenomenological scattering formula of Teubner and Strey (TS), whereas the Ornstein-Zernike scattering formula was combined with the TS formula for the lamellar phase. From the fitting parameters we have determined structural parameters such as the repeat distanceD, correlation lengthξ and 2πξ/D for both the lamellar and the two microemulsion phases. Observed results suggest that the LTM phase is more ordered than the HTM phase. Thermal fluctuations in the HTM phase may make the structure less ordered than that in the LTM phase. Again a finite value ofkξ suggests the existence of an imperfectly ordered MTL phase. Microscopic interaction parameters were determined in terms of Gompper and Schick's (GS) microscopic spin-lattice theory for a suitable lattice parameterd=15 Å. Observed interaction parameters have reasonable agreement with GS's prediction. The inequality condition ¦L¦〉J/4, suggests strong amphiphilic interaction for all three phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189499
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  • 3
    Electronic Resource
    Electronic Resource
    Structure functions and interfacial mean curvatures in a ternary amphiphilic system C12E5/water/n-octane (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 98-103 
    Details
    ISSN: 1435-1536
    Keywords: Amphiphile ; microemulsion ; lamella ; partial structure function ; mean curvature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Partial structure functions and mean curvatures of a ternary amphiphilic system consisting of water,n-octane and nonionic amphiphile C12E5 with equal volume fraction of oil and water have been studied by means of small-angle neutron scattering (SANS). Isotopic contrast variation technique was used to obtain suitable scattering contrasts of oil and water. We observed that the cross partial structure functions, that arise from the correlation between water-surfactant or oil-surfactant, change sign when the temperature passes through the hydrophile-lipophile balance (HLB) point. It indicates that the interaction parameterC of the spin-lattice model invert on HLB line. We have calculated mean curvatures considering that water or oil molecules can partially penetrate into the surfactant film. Experimental results show that mean curvatures increase as the temperature increases at a rate of 1.5×10−3 (Å−1 K−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189500
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