Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy

Ibrahim, Rosdi (1996) Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy. Masters thesis, Universiti Pertanian Malaysia.

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Abstract

Surfactant system has many applications in industry. Many investigations have been carried out on surfactants using various methods such as small-angle neutron scattering (SANS), small-angle x-ray scattering(SAXS),conductivity freeze-fracture electron microscopy and nuclear magnetic resonance(NMR).In the positron annihilation lifetime spectroscopy technique, the lifetime ('t2)of positron that interacts with surfactant medium is measured using fast coincidence system. The intensity of formation of orthopositronium(12), when positron interact with aggregate of surfactant system are sensitive to phase changes. In amphiphilic system with bicontinous character geometry of periodic phase can be explained using minimal surfaces. Factors influencing the topology includes the length of surfactant and cosurfactant tails and the aqueous volume fraction. Positron are readily attracted to these centres. Changes in the geometry of the interfacial layer thus will influence the lifetime and intensity of the orthopositronium atom formed. These parameters are obtainable using the POSITR ON FIT programme. In this study, three surfactant systems were investigated. Firstly, the intensity (12) and lifetime ("(2) of the Didodecyl DimethylAmmonium Bromide (ODAB) - Water - Octane system were measured at various amount of water content in the surfactant system in the diamond and body centred cubic phases. A symmetry transitions from diamond phase to body-centred cubic phase was observed in this system.

Item Type:Thesis (Masters)
Subject:Surface active agents.
Subject:Positron annihilation.
Subject:Spectrum analysis.
Chairman Supervisor:Professor Mohd. Yusof Sulaiman, PhD
Call Number:FSAS 1996 3
Faculty or Institute:Faculty of Environmental Studies
ID Code:8605
Deposited By: Nurul Hayatie Hashim
Deposited On:03 Dec 2010 04:24
Last Modified:11 Jun 2012 07:22

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