Now showing items 1-3 of 3

  • Critical Exponents of Thermal Phase Transitions of kappa-Carrageenan in Various Salt Solutions 

    Authors:Tarı, Özlem; Pekcan, Önder
    Publisher and Date:(Wiley-VCH Verlag GmbH, 2009)
    The steady state fluorescence (SSF) technique was employed to study the phase transitions Of kappa-carrageenan in NaCl and KCl solutions. Pyranine was used as a fluorescence probe for monitoring these transitions. Scattered light I(sc) and fluorescence intensity 1 was monitored against temperature to determine transition temperatures and exponents. It was observed that transition temperatures are strongly correlated with the NaCl and KCl contents. The weight-average degree of polymerization DP(w) ...

  • Electrical and optical percolations in PMMA/GNP composite films 

    Effects of graphene nanoplatelet (GNP) addition on the electrical conductivity and optical absorbance of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. Optical absorbance and two point probe resistivity techniques were used to determine the variations of the optical and electrical properties of the composites respectively. Absorbance intensity A and surface resistivity R-s of the composite films were monitored as a function of GNP mass fraction (M) at room ...

  • Electrical optical and fluorescence percolations in P(VAc-co-BuA)/MWCNT composite films 

    Authors:Arda, Ertan; Kara, Selim; Pekcan, Önder
    Publisher and Date:(Taylor & Francis Ltd, 2013)
    Effects of multiwall carbon nanotube (MWCNT) addition on the electrical conductivities optical transparencies and fluorescence emissions of poly(vinyl acetate-co-butyl acrylate) (P(VAc-co-BuA))/MWCNT composite films were studied. Optical transmission fluorescence emission and two point probe resistivity techniques were used to determine the variations of the optical fluorescence and electrical properties of the composites respectively. Transmitted photon intensity (I-tr) fluorescence emission ...