两亲性二氧化硅纳米片的仿生合成

In this proposal, we attempt to use block copolymers containing poly-L-lysine (PLL) as templates to synthesize silica nanoplates via biomimetic strategy. We generally use water as solvent at room temperature without using organic solvent and harsh reaction conditions. Using suitable copolymer templates, we intend to prepare water solution silica nanoplates and amphiphilic Janus silica nanplates with controllable morphology and tunable sizes. In particular, using thermal-responsive PNIPAM-PLL diblock as template, we can make thermal-responsive silica nanoplates. To make Janus type amphiphilic nanoplates, we plan to use triblock copolymer with PLL as middle block. For example, we can prepare emulsions stabilized by PS-PLL-PEG triblock. From emulsion, we can make amphiphilic Janus type silica nanplates with PS chains on one side while PEG chains on the other side. On the other hand, we can use PNIPAM-PLL-PEG as template. Upon increase of temperature, PNIPAM-PLL-PEG undergoes a coil-micelle transition. Using the thermal-induced micelle as template, we can synthesize thermal-responsive Janus-type silica nanoplates. We focus on the effects of copolymer composition, molecular weight, counter ion concentration, and reaction conditions on resulting silica nanostructure morphology. We are determined to develop new polymer-silica nanostructure materials, explore new synthetic methods, and expand new structure and functionalities. Ultimately, we address the relation between structure and properties in order to explore their possible applications in nanocomposite and catalyst carriers.

本项目以含聚赖氨酸（PLL）的两亲性嵌段共聚物为模板分子，在水溶液和室温条件下控制二氧化硅纳米片的仿生合成，来制备形貌可控、尺寸可调同时能够在溶剂中分散的二氧化硅纳米片和Janus型二氧化硅纳米片。具体研究内容包括，以PNIPAM-PLL两嵌段为模板制备水溶性、温度响应性二氧化硅纳米片；以PS-PLL-PEG三嵌段为模板分子，通过乳液法来制备Janus型两亲性的二氧化硅纳米片；以PNIPAM-PLL-PEG三嵌段为模板分子，通过升温诱导的自组装形成超分子模板制备温度响应性的Janus型二氧化硅纳米片。重点研究共聚物的组成、分子量、反离子浓度以及反应条件对二氧化硅纳米复合材料的形貌和尺寸的影响。本项目立足于发展新的复合材料体系、探索新的制备方法、拓展新的结构和功能，解释材料的结构与性能的关系及变化规律，最终探索新型高分子-二氧化硅纳米片在复合材料填充、催化剂载体等方面的应用。

本项目以含聚赖氨酸（PLL）的两亲性嵌段共聚物为模板分子，在水溶液和不同温度条件下控制二氧化硅纳米片的仿生合成，来制备形貌可控、尺寸可调同时能够在溶剂中分散的二氧化硅纳米片和Janus二氧化硅纳米片，项目实施过程中成功合成了以PLL为核心的多个两嵌段和三嵌段聚合物；并以PNIPAM-PLL两嵌段为模板制备水溶性、温度响应性二氧化硅纳米片；以PS-PLL-PEG三嵌段为模板分子，通过乳液法来制备Janus型两亲性的二氧化硅纳米片；以PNIPAM-PLL-PEG三嵌段为模板分子，通过温度诱导的自组装形成超分子模板制备温度响应性的Janus型二氧化硅纳米片。重点研究共聚物的组成、分子量、反离子浓度以及反应条件对二氧化硅纳米复合材料的形貌和尺寸的影响。自2014年1月至今，发表SCI论文7篇，申请发明专利2项，圆满完成本项目的预期目标。