Effects of Temperature and Alkyl Chain Length on the Associations of n-Fatty Acids in 1,2-Dichloroethane

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The association of saturated fatty acid (FA) with carbon number (n) of 12-18 has been investigated in 1,2-dichloroethane by measuring the fluorescence spectrum and intensity of ammonium 8-anilino-1-naphthalenesulfonate as a fluorescent probe at 25,40,50 and 60℃, and the effects of n and temperature on the association of FA were also studied. A simple phase diagram of octadecanoic acid in 1,2-dichloroethane was constructed.The critical concentration at which the dimers or the trimers of FA began to appear, C_1,was approximately the same for all cases; C_1 did not depend on n or temperature. On the contrary, the critical concentration at which the reversed micelles of FA were formed, C_2,decreased regularly as n increased. The relationship between log C_2 vs. n thus indicated a linearity.
公益社団法人日本薬学会の論文
1993-11-15