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1. Impact of B2O3 and La2O3 addition on structural, mechanical and biological properties of hydroxyapatite

Author

Sina Khoshsima, Ammar Z. Alshemary, Aysen Tezcaner, Sedat Surdem, and Zafer Evis

Subjects
biocomposites, hydroxyapatite, B2O3, La2O3, microstructure, tensile strength, Saos-2 cells, Clay industries. Ceramics. Glass, TP785-869
Abstract

In this study, hydroxyapatite-B2O3-La2O3 composites (with ≤ 20 wt.% B2O3 and ≤ 2 wt.% La2O3) were synthesized via wet precipitation method and calcined at 1100 °C for 1 h. X-ray diffraction (XRD) analysis revealed the existence of the pure hydroxyapatite (HA) phase with high crystallinity. Characteristic absorption bands of HA were also observed in Fourier transform infrared spectra. Furthermore, scanning electron microscopy images demonstrated that the addition of B2O3 and La2O3 into HA enhanced the particle growth. Mechanical properties of the composites were studied by diametral tensile test and the results showed that incorporation of 10 wt.% B2O3 and 2 wt.% La2O3 led to a 39% increase in tensile strength (compared to the pure HA). In vitro cytocompatibility of HA-B2O3-La2O3 composites was investigated using Osteosarcoma Cell Lines (Saos-2). Incorporation of B2O3 and La2O3 into HA had no toxic effect towards the cells. Based on its tensile strength properties and biological response, composite of 88 wt.% HA, 10 wt.% B2O3 and 2 wt.% La2O3 was suggested as a promising composite for bone tissue engineering applications.

Published
2018
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2. Evolution of magnetic properties of crystalline cobalt-iron boride nanoparticles via optimization of synthesis conditions using hydrous metal chlorides

Author

Mehmet Somer, Zerrin Altıntaş, Özge Balcı, Matej Bobnar, Ulrich Burkhardt, Marcus Schmidt, Sina Khoshsima, Altıntaş, Zerrin, Khoshsima, Sina, Somer, Mehmet Suat, Balcı, Özge (ORCID 0000-0001-6756-3180 & YÖK ID 295531), Schmidt, Marcus, Bobnar, Matej, Burkhardt, Ulrich, Koç University Boron and Advanced Materials Application and Research Center (KUBAM) / Koç Üniversitesi Bor ve İleri Malzemeler Uygulama ve Araştırma Merkezi (KUBAM), College of Sciences, and Department of Chemistry

Subjects
010302 applied physics, Iron boride, Materials science, Cobalt, Iron, Magnetic nanoparticles, Metal borides, Microstructure, Synthesis, Nanoparticle, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Physics, Magnetization, chemistry.chemical_compound, chemistry, Chemical engineering, Impurity, Boride, 0103 physical sciences, 0210 nano-technology
Abstract

Chemical synthesis of crystalline and nanoscale cobalt-iron metal boride powders was studied using hydrous metal chlorides and NaBH4. The effects of precursor concentration and optimized synthesis conditions on the phase formation, microstructure, and magnetic properties were investigated. After applying a reaction of CoCl2·6H2O-FeCl3·6H2O-NaBH4 at 850 °C, (CoFe)B2, (CoFe)B, Co2B, Fe3B, and Fe0.71Co0.29 boride phases were obtained from different synthesis conditions applied under autogenic pressure or Ar flow atmosphere. Oxychloride impurities were the reason for the reduced magnetization values. The highest saturation magnetization of 183 emu/g belongs to obtained nanoparticles containing (CoFe)B2 and (CoFe)B pure phases. High temperature magnetic measurements marked synthesized powders as soft magnetic materials up to 795 K while no Tc was reached for the obtained phases., Scientific and Technological Research Council of Turkey (TÜBİTAK); Novel Low Temperature Synthesis of Cobalt–Metal–Boron (Metal = Ni, Fe, Ti) Based Ternary Metal Borides from Metal Chlorides: Characterization and Application Oriented Investigations on Catalyzer/Magnet/Hybrid Composite Fabrication Project

Published
2021

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