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Miscibility and Molecular Orientation of Carbazole in Mixed Langmuir and Langmuir–Blodgett Films

Md. N. Islam, D. Bhattacharjee and S. A. Hussain

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We report the miscibility and molecular orientation of carbazole (CA) molecules in the mixed Langmuir and Langmuir–Blodgett (LB) films of CA in polymethyl methacrylate (PMMA) and stearic acid (SA) matrices. The π-A isotherm confirms the formation of stable Langmuir films of CA mixed with either PMMA or SA at air–water interface. Characteristics of area per molecule versus molefraction and collapse pressure versus molefraction reveal complete demixing of CA and the matrix PMMA/SA molecules in the mixed films. Absorption spectroscopy certainly confirms the fact that CA molecules have preferred orientation on the substrate of the LB films.


PACS

64.75.-g Phase equilibria

68.18.-g Langmuir-Blodgett films on liquids

68.03.-g Gas-liquid and vacuum-liquid interfaces

Subjects

Soft matter, liquids and polymers

Surfaces, interfaces and thin films

Dates

Issue 7 (July 2007)

Received 10 April 2007



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