COLL 119 |
| Bon Cheol Ku, Center for Advanced Materials, Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, 1 University Ave., Lowell, MA 01854, Dong Wook Kim, Advanced Materials Division, Korea Research Institute of Chemical Technology, PO Box 107, Daejeon, 305-600, South Korea, Diane Steeves, U.S. Army Soldier and Biological Chemical Command, Natick Soldier Center, Kansas Street, Natick, MA 01760, Alexandre Blumstein, Polymer Science Program, Department of Chemistry, University of Massachusetts Lowell, 1 University Avenue, Lowell, MA 01854, Jayant Kumar, Department of Physics and Chemistry, University of Massachusetts Lowell, Center for Advanced Materials, One University Avenue, Lowell, MA 01854, and Lynne A. Samuelson, U.S. Army RDECOM, Natick Soldier Center, Kansas Street, Natick, MA 01760. |
| Ordered multilayer nanocomposite films were fabricated through electrostatic layer-by-layer assembly (ELBL) of exfoliated aluminosilicate nanoplatelets and substituted ionic polyacetylenes (PEPy) with different alkyl side chains (PEPy-R). The PEPy-C18 nanocomposite membranes showed the highest hydrophobic properties when compared to other PEPy composite films with shorter alkyl side chains. The enhanced hydrophobicity is attributed to the interdigitated nanostructure of the alkyl side chains in polyacetylene. Transmission electron microscopy (TEM) and polarized UV-vis absorption spectra indicated that the conjugated chains of PEPy are ordered on the aluminosilicate nanoplatelets and that the alkyl side chains of polyacetylene were oriented. Atomic force microscopy (AFM) and wide angle X-ray diffraction (WAXD) showed that the height of aggregates of PEPy-C12 and C18 were 1 nm and 3 nm above the critical micelle concentration (cmc), respectively. Results of micellar solution studies of alkyl substituted polyacetylenes by light scattering and photoluminescence of solid films will also be reported and discussed. |
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Nanoscience and Nanotechnology
8:30 AM-11:45 AM, Monday, March 29, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |