title: Molecular rotor dynamics influenced by the elastic modulus of polyethylene nanocomposites.
abstract: We observed that the excited-state twisting motion of 3,3(')-diethyloxacarbocyanine in polymer nanocomposites (PNCs) depends strongly on the elastic modulus of medium. PNCs consist of low density polyethylene dispersed with surface-functionalized nanodiamonds with various alkyl groups. The mechanical properties of the PNCs were measured by a nanoindentation method, and the photoisomerization processes of the cyanine dye doped in the composites were investigated by time-resolved fluorescence spectroscopy. It was found that the molecular rotor dynamics in rigid media should be quantitatively describable by the elastic modulus of polymer.
authors.affiliation: Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 120-750, Republic of Korea.
authors.forename: Ah-Young
authors.initials: AY
authors.lastname: Jee
authors.forename: Haneul
authors.initials: H
authors.lastname: Kwon
authors.forename: Minyung
authors.initials: M
authors.lastname: Lee