title: Oxygen diffusion into multiwalled carbon nanotube doped polystrene latex films using fluorescence technique.
abstract: This study examines the oxygen diffusion into polystyrene (PS) latex/multiwalled carbon nanotube (MWNT) nanocomposite films (PS/MWNT) consisting of various amounts of MWNT via steady state fluorescence technique (SSF). PS/MWNT films were prepared from the mixture of MWNT and pyrene (P)-labeled PS latexes at various compositions at room temperature. These films were then annealed at 170 °C above glass transition (Tg) temperature of PS. Fluorescence quenching measurements were performed for each film separately to evaluate the effect of MWNT content on oxygen diffusion. The Stern-Volmer equation for fluorescence quenching is combined with Fick's law for diffusion to derive the mathematical expressions. Diffusion coefficients (D) were produced and found to be increased from 1.1 × 10(-12) to 41 × 10(-12) cm(2)s(-1) with increasing MWNT content. This increase was explained via the existence of large amounts of pores in composite films which facilitate oxygen penetration into the structure.
authors: Department of Physics, Yildiz Technical University, Istanbul, Turkey.
authors: Onder
authors: O
authors: Yargı
authors: Saziye
authors: S
authors: Uğur
authors: Onder
authors: O
authors: Pekcan
mesh_terms: D004058:Diffusion; D007840:Latex / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D007840:Latex; D037742:Nanotubes, Carbon; D011137:Polystyrenes; D010100:Oxygen