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    Self-Assembly of Liquid Crystal Semiconductor Molecules at the Air/Water Interface

    Year: 2002

    Journal: J. Phys. Chem. B 2002, 106, 9335-9340, 20111221

    Authors: Guodong Sui, Jhony Orbulescu, Mustapha Mabrouki, Miodrag Micic, and Roger M. Leblanc

    Organizations: Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33124 Shenggao Liu, Russell A. Cormier, and Brian A. Gregg National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401

    Self-assembly property of a new liquid crystalline perylene diimide derivative, N,N´-bis[3-[2-[2-[2-(2- cyanoethoxy)ethoxy]ethoxy]ethoxy]-propyl]perylene-3,4:9,10-tetracarboxyldiimide (PPE4CN), was studied at the air/water interface by epifluorescence microscopy and on mica by environmental scanning electron microscopy (ESEM) and atomic force microscopy (AFM). The self-assembly process started at surface pressure 5 mN/m. Molecular orientation changes of the PPE4CN molecules accompanied the self-assembly process at the air/water interface. It was found that the molecular orientation changed from face-on to edgeon orientation in the self-assembly process. These orientation changes were strongly supported by the analysis of the surface pressure-area isotherms, and by the topographic measurements at micro and nanoscale levels, including ESEM and AFM microscopies.