Characteristics of Wollastonite Ceramic Coatings Obtained by Pulsed Laser Deposition
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Characteristics of Wollastonite Ceramic Coatings Obtained by Pulsed Laser Deposition Dana‑Maria Miu1 · Sorin‑Ion Jinga1 · Georgeta Voicu1 · Florin Iordache2 Received: 23 August 2020 / Accepted: 5 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The paper aims at the synthesis and characterization of a wollastonite ceramic layer (belonging to the CaO-SiO2 system) deposited by PLD (pulsed laser deposition) method on a titanium metal substrate, in order to improve titanium biocompatibility and bioactivity. The silicate precursor mixture was synthesized by the sol–gel method. From this precursor was obtained the ceramic target by sintering at 1150 °C for 6 h. The obtained films on the titanium metal substrate were characterized by x-ray diffraction, scanning microscopy and by determination of the contact angle. Also, the materials were tested in vitro to determine the bioactivity and biocompatibility of thin films. The obtained results indicate the presence of wollastonite in films composition and a good bioactivity in the presence of cells, which suggests that this type of thin films is suitable for medical implants. Keywords Thin coating · Pulsed laser deposition (PLD) · Wollastonite ceramic material · Bioactivity
1 Introduction For long time, people have tried to use different materials to restore or support damaged tissue, observing if that those materials used do not cause side effects and are compatible with the host tissue [1]. Beginning with half XX century, the evolution of biomaterials research and their clinical applicability, had leaded to the development of three different generations: bioinert materials—first generation, bioactive and biodegradable materials—second generation, and materials designed to stimulate specific cellular responses at the molecular level—third generation. Each generation represents an evolution on the medical requirements and properties of the materials. The most used metallic biomaterial in various orthopaedic applications is titanium and its alloys, due to its * Georgeta Voicu [email protected] 1
Faculty of Applied Chemistry and Material Science, Department of Science and Engineering of Oxide Materials and Nanomaterials, University Politehnica of Bucharest, 1‑7 Gh. Polizu Street, 011061 Bucharest, Romania
Faculty of Veterinary Medicine, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 105 Splaiul Independentei, 050097 Bucharest, Romania
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mechanical strength, biocompatibility and corrosion resistance [2–4]. But titanium and its alloys also have some drawbacks such as low wear resistance, high Young’s modulus, incompatibility with blood fluids and titanium as well as its alloys do not form a direct chemical bond with the host tissue, due to the formation of a fibrous capsule at the interface which isolates the implant from the surrounding tissue and thus leads to a failure of the implant [5–7]. Another material biocompatible with human tissue is the bioceramic, although it has a much lower mechanica
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