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Fabrications of Dendrimer/Metal Oxide Nanoparticle Hybrids and Their Environmental Low Load Assemblies

树枝状聚合物/金属氧化物纳米粒子杂化物的制备及其环境低负荷组件

基本信息

批准号：
15350067
负责人：
IMAE Toyoko
金额：
$ 9.6万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

The purpose of the research subject is the synthesis of dendrimer-protected metal oxide nanoparticles at the optimum conditions, the fabrication of their one-dimensional and two-dimensional assemblies and their hybridization with linear polymers for the clarification of functionality as multifunctional sensors, environmental low load systems, or metal oxide devices. Titanium oxide nanoparticles were synthesized using hydrophilic dendritic polymers, poly(amido amine) dendrimer and poly(amido amine) dendrons with siloxy focal point and long alkyl chain spacers, as a protector. Nanoparticles were stably dispersed in water without secondary aggregation. The size and stabilization of nanoparticles depended on the ratio of metal ions with dendritic polymers rather than the dendrimer generation, tha is, nanoparticles with small size and stable dispersion were produced at high ratio of dendritic polymers. The ability of dendritic polymeer-protected TiO_2 nanoparticles as a photocatalyst for th … More e photodegradation of a water-pollutant was higher than that of nonprotected nanoparticle and superior at higher generation. It was suggested that the dendritic polymers protecting TiO_2 nanoparticle have enough void volume to conserve guest molecules and behave effectively as a reservoir of guest molecules besides as a protector. It can be concluded that the synthesized titanium dioxide nanoparticles can be expected as a environmental load-lowering materials, since they are effective as a photocatalytic compound in water.ZnO nanoparticles protected by siloxy focal dendron were synthesized by adding a NaOH ethanol solution at 〜0℃ to a zinc acetate ethanol solution. It was confirmed from X-ray photoelectron spectroscopy that Zn-O-Si covalent bond was formed in dendron-protected ZnO nanoparticles. The peak for Si-O-Si bond remarkably appeared instead of the peak for C-O-Si bond. These facts indicate that aggregates between dendrons bonding to ZnO nanoparticles coexist with self aggregates of dendrons. Additionally, in order to maintain dispersibility of ZnO nanoparticles, G3 dendron-ZnO nanoparticle composites were doped in a membrane of poly 2-hydroxyethyl methacrylate. Nanoparticles were dispersed well in the membrane. This achievement is a step for developing hierarchic organization of metal oxide/dendron hybrid to photodegradation system of environmental low load type. Less

该研究课题的目的是在最佳条件下合成树枝状聚合物保护的金属氧化物纳米颗粒，制造它们的一维和二维组件，以及它们与线性聚合物的杂交，以澄清作为多功能传感器，环境低负载系统或金属氧化物设备的功能。以亲水性树枝状聚合物、聚酰胺-胺树枝状聚合物和具有长烷基链和硅氧基的聚酰胺-胺树枝状聚合物为保护剂合成了二氧化钛纳米粒子。纳米粒子在水中稳定分散，无二次聚集。纳米粒子的尺寸和稳定性取决于金属离子与树枝状聚合物的比例，而不是树枝状聚合物的生成，即，在高比例的树枝状聚合物，生成的纳米粒子具有小尺寸和稳定的分散。研究了树枝状聚合物保护的纳米TiO_2光催化剂对苯酚降解的催化性能 ...更多信息水污染物的光降解高于未保护的纳米颗粒，并且在较高的代次下具有上级优势。结果表明，树枝状聚合物保护纳米TiO_2粒子具有足够的空隙体积来保存客体分子，除了作为保护剂外，还可以有效地作为客体分子的储存库。通过在乙酸锌乙醇溶液中加入NaOH乙醇溶液，在100 ℃下合成了硅氧基焦树枝化纳米ZnO。X射线光电子能谱（XPS）分析表明，树枝状保护的ZnO纳米粒子中形成了Zn-O-Si共价键。Si-O-Si键峰明显出现，而C-O-Si键峰没有出现。这些事实表明，与ZnO纳米颗粒键合的枝晶之间的聚集体与枝晶的自聚集体共存。此外，为了保持ZnO纳米颗粒的分散性，将G3树枝状结构-ZnO纳米颗粒复合物掺杂在聚甲基丙烯酸2-羟乙酯膜中。纳米粒子在膜中分散良好。这一成果为金属氧化物/树枝状分子杂化体系向环境低负荷型光降解体系的分级组织发展迈出了一步。少