UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 14:48
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Conference: Bucharest University Faculty of Physics 2008 Meeting


Section: Solid State Physics and Materials Science


Title:
Thin bioglass films for prothetic applications


Authors:
Luminita CRISTESCU, Roxana RADU, V. GHITA, I. SMARANDA H.V. ALEXANDRU, C. BERBECARU


Affiliation:
University of Bucharest, Faculty of Physics, Bucharest-Magurele, Romania


E-mail
lumicrist21@yahoo.com, roxana.radu@yahoo.com, valentin.ghita@yahoo.com, smaranda_nusi@yahoo.com, berbecaru2ciceron.yahoo.com,horia@infim.ro


Keywords:
bioglass thin films, SEM, XRD, FTIR investigations, SBF studies


Abstract:
Bioglasses (BG) materials containing oxides in the system (Si, P, Na, K, Ca, and Mg) are suitable for medical implant applications. The main task is to force the growth of the osteoblasts on a thin hidroxyapatite (HAP) layer developed in interaction of the body fluids with a bioactive BG layer deposited on the implants [1]. Pulsed laser deposition technique was used to obtain bioglass (BG) thin solid films on the titanium substrates. For the irradiation of the targets an UV, KrF excimer laser (ë = 248 nm, ô~7 ns) was used. BG targets with different SiO2 content (6P57–57 wt. % and 6P61–61 wt. %) sintered at 650 oC/6h was used to obtain thin films on chemically-etched high purity Ti disks. The oxygen pressure in the deposition chamber was kept at 13 Pa and the temperature of the substrate was 400 oC. The surface morphology, composition and crystallinity of the samples were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. SEM images displayed typical BG nanoparticulates on the surface layer. Infrared spectroscopy (FTIR) in the 2000 – 400 cm-1 range was used to investigate the bonds nature of the BG powders or thin layers. The stoechiometry of the PLD films was found to be the same as the targets. The amorphous structure was confirmed by XRD analysis. The surface evolution of the samples immersed in the simulated body fluid (SBF) was studied on the samples harvested at several time intervals (1, 3, 7…49 days). FTIR and XRD analysis show the presence of the HAP groups on the surface of the samples after three days. The processes of growth or dissolution involve the ionic exchange between SBF and BG, [2, 3]. The in vitro tests with osteoblasts will be further performed. References: [1] A. Oliva, A. Salerno et al, Biomaterials 19 (1998) 1019-1025, [2] E.Saiz, M.Goldman et al, Biomaterials 23 (2002) 3749-3756, [3] C. Berbecaru, H. V. Alexandru et al, e-mrs fall meeting, sep.17-21, Varsaw, 2007.