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  • 1
    ISSN: 1435-1536
    Keywords: Key words Sugar surfactant ; Anomerism ; Micelle ; Compressibility ; Static light scattering
    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  The apparent molar volume and the apparent molar adiabatic compressibility of the sugar-based surfactants methyl 6-O-octanoyl-α-d-glucopyranoside (α-MOnG), methyl 6-O-octanoyl-β-d-glucopyranoside (β-MOnG), and octyl β-d-glucoside were measured over a wide concentration range. Also, the aggregation number of their micelles was determined from the Debye plot using static light scattering data. It was found that the micellar aggregation number for α-MOnG is 179 at 35 °C, which is 1.5 times larger than that for β-MOnG, suggesting that the anomerism of the head group influences the packing of the monomers during micelle formation.
    Type of Medium: Electronic Resource
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  • 2
    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
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