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  • Küçük Resim
    Öğe
    Electrochemical behaviour of acrylamide polymers functionalized with some schiff bases
    (Gazi Univ, 2011) Deletioglu, Didem; Hasdemir, Erdogan; Solak, Ali Osman; Sari, Nursen
    CV, SWV and CA have been used to investigate the electrochemical behaviour of 2-hydroxy-5bromobenzaldehyde polyacrylamide (PABSB), 2-hydroxy-5-chlorobenzaldehyde polyacrylamide (PACSB) and 2-hydroxy-5-methylbenzaldehyde polyacrylamide (PAMSB) at the mercury electrode in aqueous media. The bromo-and chloro-derivatives were electroative while the halide-free compound, the methyl-derivative, was not. The analysis of the experimental data supports the formation of anion radicals as a result of C-X bond cleavage. Following the electron transfer step, a protonation reaction was thought to be occuring through the EirrC mechanism. The large polymeric molecules are adsorbed at the mercury electrode as expected contributing the adsorption current component to the diffusion one.
  • Küçük Resim
    Öğe
    Preparation and characterization of poly(indole-3-carboxaldehyde) film at the glassy carbon surface
    (Elsevier Science Sa, 2010) Deletioglu, Didem; Hasdemir, Erdogan; Solak, Ali Osman; Ustundag, Zafer; Guzel, Remziye
    Indole-3-carboxaldehyde (In3C) monomer was oxidized by electrochemical methods at the glassy carbon (GC) electrode in 0 05 M tetrabutylammonium tetrafluoroborate in acetonitrile with the aim to prepare a modified electrode Modification was performed using cyclic voltammetry (CV) scanning from 0 0 V to 2 0 V at a scan rate of 50 mV s(-1) for 10 cycles in 1 mM In3C monomer solution The modified GC surface (In3C-GC) was characterized by CV response of potassium ferricyanide and ferrocene redox probes as well as by the electrochemical impedance spectroscopy The modified surface was analyzed by reflection-absorption infrared spectroscopy and compared with the spectrum of the monomeric In3C Elemental composition of the surface was determined by X-ray photoelectron spectroscopy Contact angle measurements was also performed to check the changes in hydrophobic character of the bare GC and compared to that of In3C-GC surface Thickness of the oligomeric/polymeric film was investigated by ellipsometric measurements and a surface confined polymerization mechanism was proposed (c) 2010 Published by Elsevier B V