State of the Surface of Antibacterial Copper in Phosphate Buffered Saline

Download

index.pdf

Date

2017-01-01

Author

Toparlı, Çiğdem
Altin, Abdulrahman
Kasian, Olga
Scheu, Christina
Erbe, Andreas

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

27
views

14
downloads

The state was investigated of the copper surface in phosphate buffered saline (PBS; 140 mM Cl-, 10 mM phosphate; pH 7) by a combination of cyclic voltammetry (CV) and chronoamperometry (CA) with in situ spectroscopic ellipsometry and Raman spectroscopy. After polarization, samples were analyzed ex situ. In agreement with expectations on the basis of the Pourbaix diagram, Cu2O and Cu4O3 were observed when polarizing the system above approximate to-0.05 V vs. Ag vertical bar AgCl vertical bar 3M KCl. The formation of Cu2O did not lead to a passivation of the system. Rather, the system dissolved under formation of soluble square planar CuCl42-, identified by its strong Raman peak approximate to 300 cm(-1). During dissolution, spectroscopic ellipsometry showed a film with a stable steady state thickness. Energy electron loss spectroscopy (EELS) analysis of a cross section of the oxide after removal from the electrolyte showed that the oxide was Cu2O. It is suggested that Cl-replaces oxygen vacancies in the oxide layer. As soon as oxidation to Cu-II becomes dominant, the dissolution proceeds to soluble CuII species. The outer surface of copper under these conditions is hence a Cu2O-like surface, with CuII complexes present in solution. (C) The Author(s) 2017. Published by ECS. All rights reserved.

URI

https://hdl.handle.net/11511/93721

Journal

JOURNAL OF THE ELECTROCHEMICAL SOCIETY

DOI

https://doi.org/10.1149/2.0351712jes

Collections

Department of Metallurgical and Materials Engineering, Article

Suggestions

OpenMETU
Core

Preparation of biosensors by immobilization of polyphenol oxidase in conducting copolymers and their use in determination of phenolic compounds in red wine Boyukbayram, A. Efif; Kiralp, Senem; Toppare, Levent Kamil; Yagci, Yusuf (2006-10-01) Electrochemically produced graft copolymers of thiophene capped polytetrahydofuran (TPTHF1 and TPTHF2) and pyrrole were achieved by constant potential electrolysis using sodium dodecylsulfate (SDS) as the supporting electrolyte. Characterizations were based on Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Electrical conductivities were measured by the four-probe technique.
Removal of disinfection by-product precursors by UF and NF membranes in low-SUVA waters Ates, Nuray; Yılmaz, Levent; Kitis, Mehmet; Yetiş, Ülkü (Elsevier BV, 2009-2) The performance of ultrafiltration (UF) and nanofiltration (NF) membranes on disinfection by-products (DBPs) precursor removal in a surface water having low-to-medium dissolved organic carbon (DOC) and specific ultraviolet absorbance (SUVA(254)) levels was evaluated. While higher molecular weight (HMW) DOC fraction was successfully rejected (> 90%), lower molecular weight (LMW) fraction could be removed only 1.5-30% by the tested four different membranes (two UF and two NF). This finding suggested that alth...
Determination of germanium by AAS in chloride-containing matrices Anwari, MA; Abbasi, HU; Volkan, Mürvet; Ataman, Osman Yavuz (1996-06-01) Interference effects of NaCl on the ET-AAS determination of Ge have been studied. The use of several matrix modifiers to alleviate this problem such as Ni and Zn perchlorates and nitrates, nitric acid, ammonium nitrate are reported. The stabilizing effect of Zn and Ni perchlorates allows the use of high pretreatment temperatures. NaCl is thus thermally volatilized from the atomizer by employing pretreatment temperatures higher than 1500 degrees C resulting in an improved sensitivity. Germanium levels in zin...
Importance of H2O2/Fe2+ ratio in Fenton's treatment of a carpet dyeing wastewater Gulkaya, Ipek; Surucu, Gulerman A.; Dilek, Filiz Bengü (2006-08-25) The effectiveness of the Fenton's reagent (H2O2/Fe2+) in the treatment of carpet dyeing wastewater was investigated under different operational conditions, namely, H2O2 and FeSO4 concentrations, initial pH and temperature. Up to 95% COD removal efficiency was attained using 5.5 g/l FeSO4 and 385 g/l H2O2 at a pH of 3, temperature of 50 degrees C. The H2O2/Fe2+ ratio (g/g) was found to be between 95 and 290 for maximum CO removal. It was noteworthy that, keeping H2O2/Fe2+ ratio constant within the range of 9...
Investigation of copolymers of thiophene-functionalized polystyrene with pyrrole by pyrolysis mass spectrometry Papila, Ozge; Toppare, Levent Kamil; Hacaloğlu, Jale (2006-06-01) The thermal and structural characterization of electrochemically synthesized thiophene-functionalized polystyrene and pyrrole (PS/PPy) and their copolymers were investigated by direct pyrolysis mass spectrometry. The pyrolysis data confirmed the growth of polypyrrole onto the pendant thiophene moiety of polystyrene. It is determined that the electrolytic film has different properties from the mechanical mixture and the related homopolymers.

Citation Formats

Ç. Toparlı, A. Altin, O. Kasian, C. Scheu, and A. Erbe, “State of the Surface of Antibacterial Copper in Phosphate Buffered Saline,” JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 164, no. 12, pp. 0–0, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/93721.