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首页> 外文期刊>RSC Advances >Growth mechanism of bioglass nanoparticles in polyacrylonitrile-based carbon nanofibers
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Growth mechanism of bioglass nanoparticles in polyacrylonitrile-based carbon nanofibers

机译：聚丙烯腈基碳纳米纤维中生物玻璃纳米颗粒的生长机理

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摘要

Polyacrylonitrile (PAN) electrospinning in combination with sol-gel method has been a common technique to produce inorganic nanoparticles containing composite carbon nanofibers (CNFs) for diverse applications. To investigate the morphology evolution and crystal transformation of inorganic components along with CNF formation, bioactive glass (BG) containing CNFs (CNF/BG) were prepared by sintering as-spun PAN/precursor composite nanofibers in a nitrogen atmosphere at temperatures of 800, 1000 and 1200 degrees C. Comprehensive characterizations were performed with TEM, SEM-EDXA and XRD. For samples sintered at 800 degrees C, numerous BG nanoparticles were observed inside the CNFs and mainly in an amorphous state. With the sintering temperature raised to 1000 degrees C, a number of spherical BG nanoparticles were detected on the surface of the resulting CNFs, with a crystal structure of wollastonite (beta-CaSiO3) polycrystals. When the samples were sintered at 1200 degrees C, the BG nanoparticles on the surface of CNFs merged into forms with cuboid-like geometry, mainly consisting of pseudowollastonite (Ca-3(Si3O9)) single crystals. Based on the geometry evolution and dynamic size distribution function analyses (Ostwald ripening and Smoluchowski equations), it was concluded that the growth of BG nanoparticles conformed to the ripening mechanism at 800 degrees C and migration-coalescence mechanism at 1200 degrees C, while the process involved both ripening and migration-coalescence mechanisms at 1000 degrees C.
机译：聚丙烯腈（PAN）静电纺丝与溶胶-凝胶法相结合已成为生产包含复合碳纳米纤维（CNF）的无机纳米颗粒以用于各种应用的常用技术。为了研究无机成分的形态演变和晶体转化以及CNF的形成，通过在氮气气氛中以800、1000的温度烧结初生PAN /前体复合纳米纤维，制备了包含CNF（CNF / BG）的生物活性玻璃（BG）。 1200℃。用TEM，SEM-EDXA和XRD进行全面表征。对于在800摄氏度下烧结的样品，在CNF内部观察到许多BG纳米颗粒，并且主要处于非晶态。随着烧结温度升高至1000℃，在所得CNF的表面上检测到许多球形BG纳米颗粒，其具有硅灰石（β-CaSiO3）多晶体的晶体结构。当样品在1200摄氏度下烧结时，CNF表面上的BG纳米颗粒融合为长方体状的形式，主要由假硅灰石（Ca-3（Si3O9））单晶组成。根据几何演化和动态尺寸分布函数分析（奥斯特瓦尔德熟化和Smoluchowski方程），可以得出结论，BG纳米颗粒的生长符合800℃下的成熟机理和1200℃下的迁移-凝聚机理。涉及1000摄氏度下的成熟和迁移凝聚机制。

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