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Wang F.,Nanjing University of Technology | Xu Z.,Nanjing University of Technology | Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | And 3 more authors.
Ceramics International | Year: 2016

Vaterite-doped beta-dicalcium silicate bone cement has been successfully synthesized by green synthetic method. The purpose is to reduce the adverse effect caused by the hydration products Ca(OH)2 in the β-Ca2SiO4 bone cement, and improve the bioactivity of the β-Ca2SiO4 bone cement. The in vitro bioactivity of vaterite-doped β-Ca2SiO4 bone cements was evaluated compared with β-Ca2SiO4 bone cement without vaterite by soaking in simulated body fluid (SBF) for the same time (3 days). The formation abilities of hydroxyapatite (HAp) on their surfaces were analyzed by XRD, SEM, EDS and FT-IR. In addition, the setting time of vaterite-doped cement was measured. Experimental results demonstrated that vaterite-doped β-Ca2SiO4 bone cements could easily induce the formation of HAp on their surfaces after immersion in SBF. And vaterite-doped β-Ca2SiO4 bone cement has much better HAp forming ability and appropriate setting time (12±2 min) than the other one, which can not only eliminate the alkali-silica reaction (ASR) for bone cements but also be expected to be a satisfactory substrate for the bone repairing. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Yao N.,Nanjing University of Technology | Wang F.,Nanjing University of Technology | And 2 more authors.
RSC Advances | Year: 2014

Porous calcium metaphosphate (CMP) ceramics were manufactured using an in situ self-foaming method. The porous CMP ceramics with different porosities and strengths, and the preparation process and the properties of the resulting material were studied. Under the conditions of a low molding pressure (蠆2.0 MPa) or low heating rate (蠆0.5°C min-1), green specimens synthesized using only Ca(H2PO4)2·H2O (MCPM) or Ca(H2PO4)2 (MCPA) as raw materials can be fabricated into porous bioceramics without deformation and without pore-forming agents. In this study, MCPA specimens were molded at a pressure of 80.0 MPa and the heating rate was controlled at 0.5°C min-1. The synthetic biomaterial showed a porosity of 38.0% and a strength of 48.0 MPa. © The Royal Society of Chemistry 2014. Source


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Hong Z.-R.,Nanjing University of Technology | Ren Y.-P.,Shandong Institute of Advanced Ceramics Co. | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2014

Mesoporous bioactive glass (MBG) was obtained by the evaporation-induced self-assembly method which uses H3PO4 as catalyst and nonionic block copolymer (EO20PO70EO20, P123) as templates, respectively. Its average pore diameter, specific area and pore volume were 3.6 nm, 476.7 m2g- 1 and 0.49 cm 3g- 1. The structure and performance were characterized by small-angle X-ray diffraction (SAXRD), nitrogen adsorption-desorption isotherms and transmission electron micrographs (TEM). The results demonstrated that using H3PO4 as catalyst is useful to prepare MBG with larger surface area and highly ordered mesopore. In vitro bioactivity test suggested that this MBG exhibited an excellent formation of hydroxyl-carbonated apatite layer. © 2014 Elsevier B.V. All rights reserved. Source


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Wang D.,Nanjing University of Technology | Wang F.,Nanjing University of Technology | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2015

Abstract To ensure the operability of the clinical, the setting time is one of the most clinically vital factors. Sol-gel technique was used to prepare calcium silicate powders with different molar ratios of CaO/SiO2, and the calcium silicate bone cements (CSCs) were obtained in this study. Functional groups of powder and cements were analyzed by infrared spectroscopy (FT-IR). The doped cement was prepared using carboxymethylcellulose (CMC)-containing calcium silicate powder as solid phase and distilled water as liquid phase. Phase composition, morphology, setting time (St) and compressive strength (Cs) of the doped cement, after mixing with water, were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Gillmore needle and electronic universal material testing machine, respectively. In vitro mineralization of doped cement was investigated by SBF immersion test by soaking the samples individually in 10-ml of simulated body fluid (SBF) solution at 37 °C for 0, 1, 3, 7 and 15 days (d), respectively. The results indicated that the doped cement with 0.10% CMC possessed shorter setting time, higher compressive strength, and desirable bioactivity that makes it an attractive choice for use in vertebroplasty and bone filling surgery. © 2015 Elsevier B.V. Source


Zhang Y.,Nanjing University of Technology | Zhang Y.,Nanjing Haoqi Advanced Materials Co. | Yang Y.,Nanjing University of Technology | Li W.,Nanjing University of Technology | Ren Y.,Shandong Institute of Advanced Ceramics Co.
International Journal of Applied Ceramic Technology | Year: 2015

To improve the flexural strength and light-transmission properties of bone china, the effects of adding different amounts of alumina (0-3%) to bone china bodies were studied and the phase composition and microstructure of different samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, physical properties, such as the bulk density, the thermal expansion coefficient (TEC) and thermal shock resistance, were studied. It was found that adding alumina increased the overall sintering temperature while reducing the sintering temperature range of bone china. Furthermore, addition of 1% Al2O3 improved the tree-point flexural strength from 120 MPa to 150 MPa, the light transmittance (at 2 mm thickness) from 6.7% to 7.5%, the thermal expansion coefficient from 8.4 × 10-6°C-1 to 8.1 × 10-6°C-1 and the thermal shock resistance from 140°C to 180°C. Higher corundum content results in similar high flexural strength but lower light transmittance. © 2014 The American Ceramic Society. Source

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