Copyright (c) 2013 Dublin Institute of Technology All rights reserved. http://arrow.dit.ie/aegart Recent documents in Articles en-us Wed, 15 May 2013 09:46:25 PDT 3600 http://arrow.dit.ie/aegart/2 http://arrow.dit.ie/aegart/2 Mon, 11 Jun 2012 10:45:31 PDT Electrochromic films of poly(2,3,5,6-tetrafluoroaniline) (PTFA) were formed on ITO substrates from aqueous solutions utilising perchloric acid (HClO₄) as dopant. Electrochemical and spectroscopic characterization of PTFA films was performed in background electrolyte and in solutions with the addition of tetrahydrofuran. When the PTFA film was removed from its growth medium, a significant decrease in the faradaic current was observed. The faradaic response increased on addition of tetrahydrofuran which facilitates ion movement through the polymer matrix. PTFA films deposited on ITO substrate were orange and light orange in the oxidized and reduced forms, respectively. The films were ca. 25 nm in thickness. In aqueous solution the films showed a porous structure with a non-uniform distribution of pore diameters. In the presence of tetrahydrofuran a less porous structure was observed.

]]> Lavinia Astratine et al. http://arrow.dit.ie/aegart/1 http://arrow.dit.ie/aegart/1 Thu, 17 Nov 2011 05:49:18 PST The chemical structure and corrosion behaviour of stainless steel coatings with nitrogen contents up to 40 at.-% have been investigated using X-ray photoelectron spectroscopy and electrochemical tests, respectively. X-ray photoelectron spectroscopy revealed that nitrogen existed in a high binding energy form (N1s<400 >eV) at the very surface of the passive film and a nitride-like state (N1s5397?2 eV) within the coatings. For Cr, an additional peak was observed (at Cr2p5574?7 to 574?8 eV) with a binding energy that fell between those for metallic Cr and Cr nitrides. All of the coatings possessed corrosion resistance superior to that of bulk 316L in 1?0 mol L21 HCl. The passive corrosion current density initially decreased with increasing nitrogen content up to 8 at.-% above which the current density was below the resolution of the potentiostat (,0?001 mA cm22). The breakdown potential for the coatings did not change with increasing nitrogen content and was due to transpassive dissolution rather than localised corrosion. Significant substrate corrosion was observed at defects and flaws within the coatings.

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