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  • 1
    Electronic Resource
    Electronic Resource
    Micellar growth in dilute solutions of cesium perfluorooctanoate studied by small-angle X-ray and neutron scattering (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 61-63 
    Details
    ISSN: 1435-1536
    Keywords: Micelle ; small-angle scattering ; fluorinated surfactant ; disk-like micelle
    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 Small-angle X-ray and neutron scattering (SAXS and SANS, respectively) have been measured in H2O solutions of cesium perfluorooctanoate (CsPFO) in the concentration range 65–500 mM (below the phase boundary between micellar and discotic nematic phases). The data have been analyzed with a double-layered ellipsoid form factor combined with the rescaled mean-spherical approximation for the intermicellar structure factor. The scattering curves in the lower-concentration range are fitted well with oblate ellipsoid rather than prolate ellipsoid. Both the aggregation number and the degree of counterion binding increase with increasing surfactant concentration, which is consistent with the concentration dependences of the133Cs and19F NMR chemical shifts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189492
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of a Lamellar Phase Formed by Non-ionic Surfactant and Water: Effects of shear flow (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 753-758 
    Details
    ISSN: 1572-8943
    Keywords: bilayers ; lamellar phase ; SANS ; SAXS ; shear ; small-angle scattering ; surfactant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have investigated effects of shear flow on the structure of lamellar phase in hepta(oxyethylene glycol)—n—hexadecylether—water system using small-angle neutron scattering (SANS) under shear flow at the shear rates ( $$\dot \gamma $$ ) from 10−3 s−1 to 50 s−1. In the range $$\dot \gamma $$ =10−2 ~1 s−1, significant changes have been observed in both intensity and position of the reflection peak. Small-angle X-ray scattering without shear has been also measured at various concentrations and temperatures. It has been suggested from these results that the shear flow causes contraction of lamellar domains and formation of a new domain composed of disrupted bilayers which grows rapidly with increasing shear rate and reconstructs original microstructures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010121603917
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    Paper (German National Licenses)
    Fulltext
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