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Issue 7, 2004
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Self-aggregation and phase separation of a styryl dye in monolayer at the liquid–air interface and in Langmuir–Blodgett films

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Abstract

The styryl dye 4-[2-[6-(dioctylamino)-2-naphthalenyl]ethenyl]-1-(3-sulfopropyl)-pyridinium inner salt, (Di-8-ANEPPS), was incorporated in mixed Langmuir, (L), monolayers with the cationic surfactant, octadecyltrimethylammonium bromide, (OTMA). The stability of the monolayers was found to vary with the surface pressure and the amount of the diluent in the mixtures. The organization of the dye at the interface, deduced from surface pressure–area, πA, and surface potential–area, ΔVA, isotherms, is compared with the spectroscopic data in Langmuir and Langmuir–Blodgett, (LB), films. UV–visible absorption spectra of the pure dye and of the mixtures in L and LB monolayers show the formation of aggregates or domains of Di-8-ANEPPS within the matrix at high amphiphile content. On the contrary, successful transfer of the monomeric form of the dye was achieved using small molar fraction of the cationic matrix.

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Publication details

The article was received on 04 Nov 2003, accepted on 11 Feb 2004 and first published on 05 Mar 2004


Article type: Paper
DOI: 10.1039/B313987E
Citation: Phys. Chem. Chem. Phys., 2004,6, 1587-1591
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    Self-aggregation and phase separation of a styryl dye in monolayer at the liquid–air interface and in Langmuir–Blodgett films

    F. Gambinossi, P. Baglioni and G. Caminati, Phys. Chem. Chem. Phys., 2004, 6, 1587
    DOI: 10.1039/B313987E

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