caa a22 4500 463233468 CHVBK 20180405153249.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10853-006-1114-4 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1114-4 Wosu Sylvanus Department of Mechanical Engineering, University of Pittsburgh, 15261, Pittsburgh, PA, USA aut Anodic oxidation of tantalum in water and biological solutions using current limiting constant voltage method [Elektronische Daten] [Sylvanus Wosu] A reliable method is developed for preparing tantalum pentoxide film targets in natural water and biological fluids (urine, blood plasma and serum) by the anodization of tantalum metal using a current limiting constant voltage method. Tantalum pentoxide film targets are successfully prepared at a current density of 10mAcm−2 at an anodic voltage ranging from 20V to 100V without any oxide breakdown. The results show that for the same applied voltage, more ionic concentration in biological solutions leads to a higher rate of oxide growth than in water and a darker interference color. The analysis shows that anodic oxidation is more likely to breakdown in a biological environment than in pure water for the same oxidation time and applied voltage. The oxide film capacitance is found to be only slightly dependent on pH and anodic voltage with higher capacitive films in biological solutions than for water. Springer Science+Business Media, LLC, 2007 Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/11(2007-06-01), 4087-4097 0022-2461 42:11<4087 2007 42 10853 https://doi.org/10.1007/s10853-006-1114-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1114-4 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Wosu Sylvanus Department of Mechanical Engineering, University of Pittsburgh, 15261, Pittsburgh, PA, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/11(2007-06-01), 4087-4097 0022-2461 42:11<4087 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer