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Variations in Structure Explain the Viscometric Behavior of AOT Microemulsions at Low Water/AOT Molar Ratios

Artikel i vetenskaplig tidskrift
Författare Soheil Sharifi
Petra Kudla
Cristiano L. P. Oliveira
Jan Skov Pedersen
Johan Bergenholtz
Publicerad i Zeitschrift Fur Physikalische Chemie-International Journal of Research in Physical Chemistry & Chemical Physics
Volym 226
Nummer/häfte 3
Sidor 201-218
ISSN 0942-9352
Publiceringsår 2012
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 201-218
Språk en
Länkar dx.doi.org/10.1524/zpch.2012.0173
Ämnesord AOT, Microemulsions, Small-Angle X-Ray Scattering, SAXS, Viscosity, Surfactants, angle neutron-scattering, in-oil microemulsions, dynamic, light-scattering, x-ray-scattering, indirect fourier transformation, polymer-like micelles, aerosol-ot, reversed micelles, rodlike, macromolecules, concentration fluctuation
Ämneskategorier Fysikalisk kemi

Sammanfattning

The viscosity of AOT/water/decane water-in-oil microemulsions exhibits a well-known maximum as a function of water/AOT molar ratio, which is usually attributed to increased attractions among nearly spherical droplets. The maximum can be removed by adding salt or by changing the oil to CCl4. Systematic small-angle X-ray scattering (SAXS) measurements have been used to monitor the structure of the microemulsion droplets in the composition regime where the maximum appears. On increasing the droplet concentration, the scattering intensity is found to scale with the inverse of the wavevector, a behavior which is consistent with cylindrical structures. The inverse wavevector scaling is not observed when the molar ratio is changed, moving the system away from the value corresponding to the viscosity maximum. It is also not present in the scattering from systems containing enough added salt to essentially eliminate the viscosity maximum. An asymptotic analysis of the SAXS data, complemented by some quantitative modeling, is consistent with cylindrical growth of droplets as their concentration is increased. Such elongated structures are familiar from related AOT systems in which the sodium counterion has been exchanged for a divalent one. However, the results of this study suggest that the formation of non-spherical aggregates at low molar ratios is an intrinsic property of AOT.

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