Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures |
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Authors: | K Inglot T Martyński D Bauman |
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Institution: | (1) Faculty of Technical Physics, Poznań University of Technology, 13A Nieszawska Str., 60-965 Poznań, Poland |
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Abstract: | A study of azo dye/liquid crystal mixtures in monolayers formed at air-water (Langmuir films) and air-solid substrate (Langmuir-Blodgett
films) interfaces was performed. Three azo dyes with various molecular structure and two liquid crystal materials: 4-octyl-4′-cyanobiphenyl
(8CB) and trans-4-octyl(4′-cyanophenyl)-cyclohexane (8PCH) were used. The morphology of Langmuir films was monitored by means
of a Brewster angle microscope (BAM). Moreover, a surface pressure and electronic absorption spectra of the monolayer spread
on the water surface of dye/liquid crystal mixtures as a function of a mean molecular area were simultaneously recorded. In
addition, the absorption for Langmuir-Blodgett films deposited on quartz plates was measured. Information about intermolecular
interactions in the mixtures of the nonamphiphilic dye and the liquid crystal with polar terminal group was obtained. Conclusions
about the formation of self-aggregates between dye molecules have been drawn. The influence of the dye molecular structure
and its concentration on aggregates’ geometry was found. |
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Keywords: | Langmuir film Langmuir-Blodgett film azo dye liquid crystal electronic absorption |
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