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Subject: electrochemistry × WGL Institute: IFWD ×

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    The First Products of Aniline Oxidation – SERS Spectroelectrochemistry
    (Weinheim : Wiley-VCH, 2019) Morávková, Zuzana; Dmitrieva, Evgenia
    There are different opinions on the first products of aniline oxidation throughout the scientific community. While electrochemists basically accept only linear oligomers with repeating units joint in para positions, chemists have proposed formation of various branched and polycyclic oligomers. It was also suggested that one of these structures, N-phenyl-phenazinium cation, is responsible for the adherence of polyaniline films to substrates. In this work, a surface enhanced Raman spectroscopic and spectroelectrochemical analysis of the species adsorbed onto gold surface in aniline-containing solution at pH 1 and 5 is presented. The influence of the pH value on the oligomer structure is declared. The results are discussed in the context of linear and branched/phenazine-like aniline oligomers. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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    Get more out of your data: A new approach to agglomeration and aggregation studies using nanoparticle impact experiments
    (Hoboken, NJ : Wiley, 2013) Ellison, Joanna; Tschulik, Kristina; Stuart, Emma J.E.; Jurkschat, Kerstin; Omanovi´c, Dario; Uhlemann, Margitta; Crossley, Alison; Compton, Richard G.
    Anodic particle coloumetry is used to size silver nanoparticles impacting a carbon microelectrode in a potassium chloride/citrate solution. Besides their size, their agglomeration state in solution is also investigated solely by electrochemical means and subsequent data analysis. Validation of this new approach to nanoparticle agglomeration studies is performed by comparison with the results of a commercially available nanoparticle tracking analysis system, which shows excellent agreement. Moreover, it is demonstrated that the electrochemical technique has the advantage of directly yielding the number of atoms per impacting nanoparticle irrespective of its shape. This is not true for the optical nanoparticle tracking system, which requires a correction for the nonspherical shape of agglomerated nanoparticles to derive reasonable information on the agglomeration state.