有序大孔碳模板法制备二氧化硅基微球材料

发布时间：2018-02-16 05:01

本文关键词： 碳模板生物活性玻璃氧化铁复合材料导电性　出处：《扬州大学》2015年硕士论文　论文类型：学位论文

【摘要】：微球材料由于其独特的球形结构及比表面积大,被越来越多的研究者关注。最新的研究表明,生物活性玻璃具有优良的生物活性和生物相容性,还具有细胞和基因激活作用,这对于硬组织修复功能起到关键作用。氧化铁材料具有稳定、禁带宽度窄以及对环境的无害等优点,被广泛的应用于很多领域,尤其是光催化领域。材料的性能决定于材料的结构,制备具有特殊结构的材料将大大提高并改善材料的性能。利用三维有序大孔碳模板复制可以制备出尺寸均一、粒径可控的微球材料。本文首先以三维有序大孔碳为模板,采用溶胶凝胶法结合溶剂挥发诱导自组装(EISA)过程,制备了生物活性玻璃微球(BGs)。通过EDS测试确定BGs的组成为58S-BGs,分别采用SEM、XRD、FT-IR对其形貌、晶型、组成进行表征,通过DLS测试其粒径及粒径分布。结果表明,制得的58S-BGs是直径约为300nm,粒径均一的非晶态微球。在人体模拟体液SBF中对58S-BGs进行降解实验研究,评价其生物活性及生物降解能力。通过FT-IR、SEM、XRD对其降解后的产物进行组成及结构表征；通过ICP检测降解过程中SBF中相关离子浓度的变化。结果表明,58S-BGs具有良好的生物活性和生物降解性。以三维有序大孔碳为模板,制备了Fe2O3/SiO2复合微球,利用TEM表征其形貌,采用XRD、VSM分析其晶型及磁学性能,通过DLS测试其粒径及粒径分布。结果表明,制得的Fe2O3/SiO2复合微球是粒径均一(直径约为400 nm)的空心微球,其主要成分是晶态α-Fe2O3和非晶态SiO2,饱和磁化强度为2.89emu/g,矫顽力约为210e,表现出顺磁性。将SiO2胶体晶模板浸泡在酚醛树脂的乙醇溶液中,通过高温热处理制备C/Si02复合材料。利用SEM对材料的形貌进行表征,通过TG分析确定材料的组分含量,采用XRD分析其晶型,并探究了材料的导电性能。结果表明,制得的复合材料由晶态的Si02及非晶态的碳组成,材料中C和Si02质量比为18.84,材料以三维有序密堆积的Si02微球为主体,碳填充在Si02微球之间的空隙中,形成连续的三维有序网络,材料的平均电阻率p=5284.16Ω·m,具有导电性。利用有序大孔碳模板能够制备出形貌结构完好且粒径均一的微球材料,为功能性微球材料的制备提供一种新的制备方法及思路。
[Abstract]:Because of its unique spherical structure and large specific surface area, microspheres have attracted more and more attention. Recent studies have shown that bioactive glass has excellent bioactivity and biocompatibility, and it also has the function of cell and gene activation. This plays a key role in the repair of hard tissue. Iron oxide is widely used in many fields because of its advantages of stability, narrow band gap and environmental harmfulness. Especially in the field of photocatalysis, the properties of materials depend on the structure of materials. The preparation of materials with special structure will greatly improve the performance of materials. In this paper, three dimensional ordered macroporous carbon was used as template and sol-gel method combined with solvent volatilization induced self-assembly (EISAs) process. Bioactive glass microspheres were prepared. The composition of BGs was determined to be 58S-BGsby EDS test. The morphology, crystal form and composition of BGs were characterized by SEM-XRDT-IR, and the particle size and particle size distribution were measured by DLS. The prepared 58S-BGs were amorphous microspheres with a diameter of about 300 nm and uniform diameter. The bioactivity and biodegradability of 58S-BGs were studied in simulated body fluid SBF. The composition and structure of the degraded products were characterized by FT-IRI SEMX XRD. The changes of ion concentration in SBF during degradation were detected by ICP. The results showed that the bioactivity and biodegradability of Fe2O3/SiO2 composite microspheres were studied. Fe2O3/SiO2 composite microspheres were prepared using three-dimensional ordered macroporous carbon as template, and the morphology of Fe2O3/SiO2 composite microspheres was characterized by TEM. The crystal structure and magnetic properties of the composite microspheres were analyzed by XRD-VSM, and the particle size and particle size distribution were measured by DLS. The results show that the prepared Fe2O3/SiO2 composite microspheres are hollow microspheres with uniform diameter (about 400nm in diameter). The main components are crystalline 伪 -Fe _ 2O _ 3 and amorphous Sio _ 2, the saturation magnetization is 2.89 emu / g, the coercivity is about 210 e. the SiO2 colloidal crystal template is immersed in the ethanol solution of phenolic resin. C / Si02 composites were prepared by high temperature heat treatment. The morphology of the composites was characterized by SEM, the composition content was determined by TG analysis, the crystal structure was analyzed by XRD, and the electrical conductivity of the composites was investigated. The composite is composed of crystalline Si02 and amorphous carbon. The mass ratio of C and Si02 is 18.84. The material consists of three dimensional ordered and densely packed Si02 microspheres, and carbon is filled in the voids between Si02 microspheres to form a continuous three-dimensional ordered network. The average resistivity of the material is 5284.16 惟路m, which has electrical conductivity. The ordered macroporous carbon template can be used to prepare microspheres with good morphology and uniform particle size, which provides a new preparation method and thought for the preparation of functional microspheres.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.2

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