Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy

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...

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Main Author:	Ibrahim, Rosdi
Format:	Thesis
Language:	English English
Published:	1996
Subjects:	Surface active agents. Positron annihilation. Spectrum analysis.
Online Access:	http://psasir.upm.edu.my/id/eprint/8605/1/FSAS_1996_3_A.pdf
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spelling	my-upm-ir.86052012-06-11T07:22:57Z Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy 1996 Ibrahim, Rosdi 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. Surface active agents. Positron annihilation. Spectrum analysis. 1996 Thesis http://psasir.upm.edu.my/id/eprint/8605/ http://psasir.upm.edu.my/id/eprint/8605/1/FSAS_1996_3_A.pdf application/pdf en public masters Universiti Pertanian Malaysia Surface active agents. Positron annihilation. Spectrum analysis. Faculty of Environmental Studies English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Surface active agents. Positron annihilation. Spectrum analysis.
spellingShingle	Surface active agents. Positron annihilation. Spectrum analysis. Ibrahim, Rosdi Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy
description	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.
format	Thesis
qualification_level	Master's degree
author	Ibrahim, Rosdi
author_facet	Ibrahim, Rosdi
author_sort	Ibrahim, Rosdi
title	Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy
title_short	Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy
title_full	Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy
title_fullStr	Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy
title_full_unstemmed	Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy
title_sort	structures of surfactant system studied by positron annihilation lifetime spectroscopy
granting_institution	Universiti Pertanian Malaysia
granting_department	Faculty of Environmental Studies
publishDate	1996
url	http://psasir.upm.edu.my/id/eprint/8605/1/FSAS_1996_3_A.pdf
_version_	1747810837208236032

Structures of Surfactant System Studied by Positron Annihilation Lifetime Spectroscopy

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