PhD Theses & Dissertations

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Browsing PhD Theses & Dissertations by Subject "Mineral and vegetable oils."

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    Optical activity and faraday effect in some mineral and vegetable oils.
    (Makerere University (unpublished work), 2000-03) Mucunguzi-Rugwebe.R.E.R
    This Thesis presents results of a study of Optical Activity and Faraday Effect (OAFE) in some mineral and vegetable oils in the temperature range of 6°C to 45°C and magnetic field up to 140mT. Intrinsic birefringences responsible for Optical Activity were found in vegetable oils with impurities and all mineral oils. The results of Optical Activity in both types of oils obeyed the equation (0. 1) where Qw .,, is the angle at which minimum irradiance I min occurs in water and other substances which are optically inactive, is the rotation angle in the medium and A is a rotation due to impurity concentration. The results show that, the more the impurity concentration is in the vegetable oil, the greater the rotation angle. The rotation angle is almost directly proportional to impurity concentration. When static magnetic field was applied to mineral oils and vegetable oil with impurities, the rotation angle obeyed the equation = Ml