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Fabrication and up-conversion fluorescence property of Er<sup>3+</sup>/Yb<sup>3+</sup> co-doped Ca-Si-Ti biomaterials
摘要： This work demonstrates bulk-type up-conversion biomaterials which could be used as a bone repair material with the ability to monitor bone mineralization. Er3+/Yb3+ co-doped Ca-Si-Ti (CST3: TiO2 content is 30 mol%) bulk biomaterials were prepared via containerless processing technique in an aerodynamic levitation furnace and with subsequently heat treatment. The up-conversion fluorescence property was influenced by Yb3+ doping concentration, heat-treatment and mineralization in simulated body fluid (SBF). Optimum emission intensities were obtained for the sample with 20 mol% of Yb3+ doping concentration and heat treatment at 937 °C for 2 h. Hydroxyapatite (HAP) deposition was observed on the surface of the samples after soaking in SBF for 14 days, and the up-conversion fluorescence intensity of the samples decreased with the increase of soaking time. This indicates that Er3+/Yb3+ co-doped CST3 materials are bioactive, in which the HAP mineralization in bone repair could be monitored by measuring the intensity change of up-conversion fluorescence.
关键词： Heat treatment,Up-conversion fluorescence,Containerless processing,Mineralization,Er3+/Yb3+ co-doped Ca-Si-Ti biomaterial
更新于2025-09-23 15:23:52
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[Springer Series on Polymer and Composite Materials] Polymer/POSS Nanocomposites and Hybrid Materials (Preparation, Properties, Applications) || POSS Hybrid Materials for Medical Applications
摘要： Medical application is one of the most important issues in the field of material science and has found very high level of attention. During the last decades, the development of new methods or materials which can improve the quality of medical services has been very intense. Using nanotechnology provides new rooms to enhance this field. Polyhedral oligomeric silsesquioxane (POSS) is a new generation of nanostructures showing the properties of nanoparticles and molecules at the same time. Improving thermal and mechanical properties and enhanced solubility are interesting characteristics found in these materials. POSS can be used in medical applications, broadly. It can improve mechanical properties of biomaterials that are very important in tissue engineering. Also, it can improve the resistance of biomaterials against degradation. Today, dental materials use POSS as a key component. Drug delivery and bioimaging are other examples that use POSS as discussed in this chapter.
关键词： POSS,Dental nanocomposite,Bioimaging,Biomaterial,Drug delivery,Tissue engineering
更新于2025-09-23 15:21:01
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Efficiency Improvement of Cellulose Derivative Nanocomposite Using Titanium Dioxide Nanoparticles
摘要： TiO2 nanoparticles were incorporated into hydroxypropyl methylcellulose (HPMC) nanocomposites films. The nanocomposites were investigated in relation to their structural, mechanical, and surface properties using scanning electron microscopy (SEM). The water solubility of the films showed a small decrease with respect to the nanocomposites films' content of the TiO2 nanoparticles. Incorporation of TiO2 nanoparticles in the films improved their mechanical and barrier properties significantly. SEM images showed that the lower concentration of nanoparticles were better dispersed in the nanocomposite matrix. The disk diffusion studies revealed a great bactericidal effectiveness for nanocomposite films containing smaller concentration of particles. In general, it was observed that the incorporation of the nanoparticles positively affected the structural properties and enhanced the antibacterial applications of the nanocomposites.
关键词： Biomaterial,Nano-Structures,Polymer-Matrix Composites,Mechanical Properties
更新于2025-09-19 17:15:36
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CoCr alloy processed by Selective Laser Melting (SLM): effect of Laser Energy Density on microstructure, surface morphology, and hardness
摘要： Selective Laser Melting (SLM) was used to realize Co-28Cr-6Mo samples. Several process parameters were considered, resulting in a wide range of Laser Energy Density (LED). The study was focused on the investigation of both process and material-related aspects, such as surface morphology, laser tracks dimension and defects formation mechanisms. In addition, macro (HRC) and microhardness (HV0.5) was assessed. A correlation between LED value and density, surface quality, microstructural features and hardness of SLM parts was defined. The final goal was to identify, for the biomedical Co-28Cr-6Mo alloy, the optimal LED window to be considered in order to maximize the overall quality of SLM parts.
关键词： Additive Manufacturing (AM),Biomaterial,Selective Laser Melting (SLM),Laser Beam Melting (LBM),Co28Cr6Mo,Co-based alloys
更新于2025-09-19 17:13:59
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Laser Marked and Textured Biomaterial Evaluated by Mott- Schottky Technique
摘要： The effect of an optical fiber laser marking and texturing techniques on the surface of the ISO 5832-1 stainless steel via the Mott-Schottky approach was evaluated in this work. This is one of the most commonly used biomaterial for permanent implants manufacture. It was found that the pulsed laser treatment increases the susceptibility to corrosion by changes on the roughness, microstructure and surface chemical composition; which affect the surface passivity, comparatively to the non treated biomaterial. In this study, the Mott-Schottky technique was very sensitive to identify the effect of the type of surface treatment, marking and texturing, according to the laser pulse frequency modification on the electronic properties of the oxide layer. The change in the semiconductors behavior was the main procedure proposed to explain the increased susceptibility to localized corrosion associated to the areas affected by the Yb optical fiber laser engraving and texturing process.
关键词： electrochemistry,laser,texturing,Biomaterial,marking
更新于2025-09-12 10:27:22