Online ISSN : 1884-6440
Print ISSN : 0385-1036
ISSN-L : 0385-1036
Microphase Separation in Mixed Langmuir Monolayers
Nobuaki MutohHiroshi FukudaToyoko ImaeAyako Goto
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2003 Volume 28 Issue 3 Pages 151-154


The surface pressure-area (II-A) isotherm curves of pure and mixed monolayers which have been reported by Mori and Imae [Langmuir 11, 4799 (1955)] were analyzed to get the molecular insight into mixed monolayers. The II-A isotherm curves of the pure octadecyldimethylamine oxide {CH3 (CH2) 17NO (CH3) 2, C18DAO}, the pure arachidic acid {CH3 (CH2) 18COOH, AA} monolayers and the mixed monolayers were analyzed to assume the mixed situation between C18DAO and AA at the air-water interface. As a result, it was assumed that part of C18DAO molecules forms mixed clusters with AA molecules and the residual C18DAO molecules exit individually without any formation of mixed clusters with AA in the mixed monolayer. Not only the ratio of the clustered C18DAO molecules to the total C18DAO molecules was estimated, but also the mixed cluster's composition in the mixed monolayers was deduced to be 2 : 1 for AA and C18DAO. The resultant H-A curves well fitted with the observation.
It is concluded that the microphase separation occurs with the mixed clusters as well as free C18DAO molecules in the mixed monolayer.

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