Abstract
Micellar surface potentials (Δψ) of icosapolyenoic acids (IPA) having 25 double bonds were determined at 25°C from fluorescence intensity of ammonium 8-anilino-1-naphthalenesulfonate as a fluorescent probe. The surface potential, |-Δψ|, of IPA micelles decreased with increase in the number of double bond in the IPA molecule. Decrease in |-Δψ| by the introduction of a double bond in the IPA molecule was approximately 13.12mV at ionic strength 0.02mol dm-3. The relationship was represented well by the following equation : Δψ/mV=-108.0+13.12n, where n is the number of C=C double bonds in an IPA molecule. Surface charge density |-σ| of IPA micelles based on the Gouy-Chapman theory was found to diminish as n increased. The relationship can be expressed well by the following equation : σ/c cm-2=-3.386×10-6+2.463×10-6·(√n-√2), where n≥2.
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