【作者】 王金玉；

【导师】 张歆；

【作者基本信息】 汕头大学 ， 生物化学与分子生物学， 2010， 硕士

【摘要】 本论文的主要工作是利用仿生矿化的原理,以人工合成多肽—多聚赖氨酸为诱导剂,聚碳酸酯膜作为硬模板提供特定的空间,在常温常压条件下制备出了特定形貌的二氧化硅材料—管、棒状。采用EDS,TGA,SEM,FTIR等检测手段研究了产物的组成和形貌,EDS,TGA,FTIR分析表明产物为二氧化硅和多肽的复合物,同时考察了反应过程中对二氧化硅成核、生长及最终形态结构有重要影响的因素;且利用原子力显微镜在固相状态下实时、跟踪多肽介导硅合成的过程,进一步探讨多肽分子介导的仿生合成纳米硅材料的机理。主要研究内容及结论如下:(1)仿生合成法制备特定形貌的硅纳米材料及影响因素的探讨我们以人工合成的多聚赖氨酸为诱导剂,硅酸钠为前驱体,聚碳酸酯膜作为硬模板提供特定的空间,在常温常压条件下在体外合成纳米硅材料,并且研究了反应过程中的各物理化学因素对反应的影响。研究发现人工合成的多聚赖氨酸均能够在常温常压条件下介导硅的仿生合成,在pH=3.0的硅酸钠溶液生长60min时能够制备出比较规则的管棒状硅纳米材料;X射线能谱(EDS)和热重分析证明产物为硅和多肽的复合物。(2)应用原子力显微镜(AFM)在固相状态下成功的完成了跟踪多聚赖氨酸介导合成纳米硅材料的过程。应用AFM跟踪拍摄了0min-60min之间的图象的变化,记录了矿化反应的过程,并且为解释硅矿化过程的机理提出了一个合理的模型图,为硅生物矿化机理的研究提供了实验依据。更多还原

【Abstract】 The main work of this paper is to use biomimetic principles by synthetic peptides poly-lysine as inducer, polycarbonate film as a hard template to provide a specific space, under conditions of normal temperature and pressure, formed a particular appearance of the silica materials-pipe, rod-like. Using EDS, TGA, SEM, FTIR and other detecting methods of the composition and morphology of the products.EDS, TGA, FTIR analysis showed that the product is silicon dioxide and peptide complex. We also studied the factors during the course of silica nucleation,growth and final morphology,which have a major impact.The use of atomic force microscopy in solid-phase state, real-time tracking process of peptide mediated silicon synthetic.Further study of biomimetic mechanism of peptide molecule-mediated synthesis of nano-silicon materials.Main contents and conclusions are as follows:(1) Preparation of a specific morphology of biomimetic synthesis of silicon nano-materials and influence of factorsWe use synthesized poly-lysine as the induction agent, sodium silicate as precursor, polycarbonate film as a hard template to provide a specific space,synthesis nano-silicon materialsthe in vitro under normal temperature and pressure conditions and research the reaction of the physical and chemical factors. Study found that synthetic poly-lysine is able to synthesis silicon under normal temperature and pressure.The sodium silicate solution pH is 3.0,the growth time is 60min, the rules rod-like can be prepared silicon nano-materials management. X-ray spectroscopy (EDS) and thermal analysis proved that the product is a compound of silicon and peptides. (2) Application of Atomic Force Microscope (AFM) in the solid phase completed successfully tracking polylysine-mediated synthesis of nanometer silicon process. Application of AFM images recorded changes in response to the early mineralization process and to explain the mechanism of silica mineralization model presents a reasonable plan for the mechanism of silica biomineralization provides an experimental basis.更多还原