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- W175049716 abstract "Surfactant system has many applications in industry. Manyinvestigations have been carried out on surfactants using various methodssuch as small-angle neutron scattering (SANS), small-angle x-ray scattering(SAXS),conductivity freeze-fracture electron microscopy and nuclearmagnetic resonance(NMR).In the positron annihilation lifetime spectroscopytechnique, the lifetime ('t2)of positron that interacts with surfactant medium ismeasured using fast coincidence system. The intensity of formation oforthopositronium(12), when positron interact with aggregate of surfactantsystem are sensitive to phase changes. In amphiphilic system with bicontinous character geometry of periodic phase can be explained usingminimal surfaces. Factors influencing the topology includes the length ofsurfactant and cosurfactant tails and the aqueous volume fraction. Positronare readily attracted to these centres. Changes in the geometry of theinterfacial layer thus will influence the lifetime and intensity of theorthopositronium atom formed. These parameters are obtainable using thePOSITR ON FIT programme.In this study, three surfactant systems were investigated. Firstly, theintensity (12) and lifetime ((2) of the Didodecyl DimethylAmmonium Bromide(ODAB) - Water - Octane system were measured at various amount of watercontent in the surfactant system in the diamond and body centred cubicphases. A symmetry transitions from diamond phase to body-centred cubicphase was observed in this system." @default.
- W175049716 created "2016-06-24" @default.
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- W175049716 date "1996-01-01" @default.
- W175049716 modified "2023-09-24" @default.
- W175049716 title "Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy" @default.
- W175049716 hasPublicationYear "1996" @default.
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