Browsing by Author "Feleke, Abraham"

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    Electroop'l'ical Method of Dt'ermina'l'ion of the Permanent Dipole Moment of Coli,Oidal Particles
    (Addis Ababa University, 1984-06) Feleke, Abraham; A.A. Spartakov (PhD)
    ~qO tYges of rectangular electric fields (Rl - and R2~field) are produced by a specially constructed generator. IHhen Rl ~ field acts on the caracitor plates between ~Ihich is the solution to be investigated, the colloidal particles rotate and modulate the intensity of light that passes through the solutioIl. The electric dipole moment is given by the expression 6KTT ~n{ (~ - 1) + 2 1 t(~· .- 1) 11 FT o R2-field is used for the determination of the time of relaxation T. '['he electric field E is choosen and the para~ meters b and TO are measured. Although specimens of diffe~ rent chemical and physical nature are investigated the dipole moment per tmit area \.1 0 is almost the same for all specimens \.I lies in the ranae (1.4 - 2.0) x 10-4 CGSE