Anca Parau
Dokuz Eylül University
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Publication
Featured researches published by Anca Parau.
Journal of Materials Engineering and Performance | 2014
V. Braic; M. Balaceanu; M. Braic; C. Vitelaru; Irina Titorencu; Vasile Pruna; Anca Parau; C. Fanara; A. Vladescu
The Ti-10Nb-10Zr-5Ta alloy, prepared in a levitation melting furnace, was investigated as a possible candidate for replacing Ti6Al4V alloy in medical applications. The sessile drop method, pin-on-disc and in vitro tests were used to analyze wettability, wear resistance, and biocompatibility of the new alloy. The characteristics of the Ti-10Nb-10Zr-5Ta alloy were assessed in comparison to those of the Ti6Al4V alloy. The Ti-10Nb-10Zr-5Ta system was found to have hydrophilic characteristics with similar contact angle as the Ti6Al4V alloy. In all environments (deionized water, simulated body fluid and Fusayama Meyer artificial saliva), the friction coefficient showed a stable evolution versus sliding distance, being similar for both alloys. On overall, the wear resistance of Ti-10Nb-10Zr-5Ta alloy was lower than that of Ti6Al4V for all testing environments. The Ti-10Nb-10Zr-5Ta alloy exhibited good biocompatibility characteristics at in vitro test compared to Ti6Al4V alloy. The cell viability on Ti-10Nb-10Zr-5Ta surfaces was higher than the one observed on Ti6Al4V samples, regardless the number of days spent in osteoblast-like cells culture. A high degree of cell attachment and spreading was observed on both alloys.
Polymers | 2018
Denis Mihaela Panaitescu; Raluca Gabor; Cristian Andi Nicolae; Anca Parau; Catalin Vitelaru; Valentin Raditoiu; Mircea Chipara
The control of morphology and interface in poly(styrene-ethylene/butylene-styrene) (SEBS) composites with graphitic fillers is extremely important for the design of piezoresistive sensors for body motion or flexible temperature sensors. The effects of a high amount of graphite (G) and silane coupling agent on the morphology and properties of SEBS composites with anisotropic mechanical properties are reported. The physical and chemical bonding of silane to both G and SEBS surface was proved by EDX and TGA results; this improved interface influenced both the thermal and mechanical properties of the composite. The vinyltriethoxysilane (VS) promoted the formation of char residue and, being tightly bound to both SEBS and G, did not show separate decomposition peak in the TGA curve of composites. The mechanical properties were measured on two perpendicular directions and were improved by both the addition of VS and the increased amount of G; however, the increase of storage modulus due to orientation (from 5 to 15 times depending on the composition and direction of the test) was more important than that provided by the increase of G concentration, which was a maximum of four times that obtained for 15 wt % graphite. A mechanism to explain the influence of G content and treatment on the variation of storage modulus and tan δ depending on the direction of the test was also proposed.
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine | 2015
Funda Ak Azem; Işıl Birlik; V. Braic; M. Toparli; Erdal Celik; Anca Parau; A. Kiss; Irina Titorencu; A. Vladescu
Bioactive coatings are frequently used to improve the osseointegration of the metallic implants used in dentistry or orthopaedics. Among different types of bioactive coatings, hydroxyapatite (Ca10(PO4)6(OH)2) is one of the most extensively used due to its chemical similarities to the components of bones and teeth. In this article, production and characterization of hydroxyapatite films deposited on Ti6Al4V alloy prepared by magnetron sputtering were reported. Besides, SiC was deposited on substrate surface to study the interlayer effect. Obtained coatings were annealed at 600 °C for 30 and 120 min in a mixed atmosphere of N2 + H2O vapours with the heating rate of 12 °C min−1. The effects of SiC interlayer and heat treatment parameters on the structural, mechanical and corrosion properties were investigated. After heat treatment process, the crystalline hydroxyapatite was obtained. Additionally, cell viability tests were performed. The results show that the presence of the SiC interlayer contributes a decrease in surface roughness and improves the mechanical properties and corrosion performance of the hydroxyapatite coatings. Biological properties were not affected by the presence of the SiC interlayer.
Key Engineering Materials | 2013
Mihaela Dinu; A. Kiss; Anca Parau; V. Braic; C. Vitelaru; M. Braic; Iulian Pana; M. Balaceanu; A. Vladescu
In this paper we report on the preparation and characterization of hydroxyapatite coatings deposited on Ti6Al4V alloy by magnetron sputtering deposition method. The amorphous deposited coatings were thermal annealed in a flux of dry nitrogen and water vapours at 800 °C for 30 and 120 minutes, in order to investigate the effect of this treatment on surface roughness, corrosion resistance and wettability. The films were characterized by surface profilometry, electrochemical tests and contact angle measurements. After annealing, the hydroxyapatite coatings became crystalline, exhibiting rougher surfaces, higher corrosion resistance and lower contact angles. We have demonstrated that the hydroxyapatite coating annealed at 800°C for 30 minutes represents a good candidate to be used for medical implants, due to its superior corrosion behaviour and good wettability.
Applied Surface Science | 2015
A. Vladescu; M. Braic; F. Ak Azem; Irina Titorencu; V. Braic; Vasile Pruna; A. Kiss; Anca Parau; Işıl Birlik
Thin Solid Films | 2013
C.M. Cotrut; V. Braic; M. Balaceanu; Irina Titorencu; M. Braic; Anca Parau
Vacuum | 2015
M. Braic; M. Balaceanu; Anca Parau; Mihaela Dinu; A. Vladescu
Surface & Coatings Technology | 2014
C. Vitelaru; M. Balaceanu; Anca Parau; C. Luculescu; A. Vladescu
Journal of Materials Engineering and Performance | 2013
A. Vladescu; V. Braic; M. Balaceanu; M. Braic; Anca Parau; S. Ivanescu; C. Fanara
Tribology Letters | 2015
M. Balaceanu; Anca Parau; M. Braic; A. Vladescu; C. Luculescu; C. Logofatu; V. Braic