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首页> 外文期刊>Materials science & engineering >Protein adsorption and in vitro behavior of additively manufactured 3D-silicon nitride scaffolds intended for bone tissue engineering
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Protein adsorption and in vitro behavior of additively manufactured 3D-silicon nitride scaffolds intended for bone tissue engineering

机译:用于骨组织工程的含有含有添加到含有3D硅氮化硅支架的蛋白质吸附和体外行为

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摘要

Highly porous scaffolds of Si3N4 are fabricated by direct ink writing method (Robocasting) with a pattern of macroporous cavities of 650-700 mu m. Two different Si3N4 ink compositions regarding the oxide sintering aids (namely, Y2O3, Al2O3, and SiO2) are tried. Both inks reach solid volume fractions of similar to 0.40 with about 10-12 wt % of polymeric additive content that imparts the necessary pseudoplastic characteristics. The printed structures are sintered under controlled N-2 atmosphere either in a conventional graphite furnace or by the spark plasma sintering technique. Skeleton of the scaffolds reaches densities above 95% of the theoretical value with approximate to 18-24% of linear shrinkage. Analysis of the crystalline phases, microstructure and mechanical properties are comparatively done for both compositions. The bioactivity of these structures is addressed by evaluating the ion release rate in simulated body fluid. In parallel, atomic force microscopy is used to determine the effect of the filaments surface roughness on protein adsorption (Bovine Serum Albumin) for assessing the potential application of 3D-Si3N4 scaffolds in bone regeneration.
机译:通过直接油墨书写方法(Robocasting)制造Si3N4的高度多孔支架,具有650-700 mm m的大孔腔图案。尝试两种不同的Si3N4油墨组合物(即,Y 2 O 3,Al 2 O 3和SiO 2)。两种油墨达到类似于0.40的固体体积分数,其具有约10-12重量%的聚合物添加剂含量,其赋予必要的假塑性特性。印刷结构在传统的石墨炉中或通过火花等离子体烧结技术在控制的N-2气氛下烧结。支架的骨架达到高于95%的理论值的密度,近似为线性收缩的18-24%。两种组合物的结晶相,微观结构和机械性能的分析相媲美。通过评估模拟体液中的离子释放速率来解决这些结构的生物活性。同时,原子力显微镜用于确定细丝表面粗糙度对蛋白质吸附(牛血清白蛋白)的影响,用于评估3D-Si3N4支架在骨再生中的潜在应用。

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