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Preparating of Ultrafine Particles in Inorgaic Gel and Their Fixation

无机凝胶超细颗粒的制备及其固定

基本信息

批准号：
10650754
负责人：
MORI Yasushige
金额：
$ 2.3万
依托单位：
Doshisha University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650754/
关键词：
Inorganic Gel Clay Synthetic Clay Nanoparticles Colloidal Gold Fixation Water Soluble Polymer Membrane ゾルスメグタイト

项目摘要

Most of functional materials consist of nanoparticles, which only have superior functions when nanoparticles disperse well. Due to the strong tendency of the coagulation of particles, however, there are many efforts to seek the dispersion methods of nanoparticles and the fixation methods of the dispersion state. In this projects, colloidal gold was used as nanoparticles, which could be applied to the functional materials, such as catalysis, non-linear optical device and substance for the surface Raman enhanced analysis. I investigated about the dispersion and fixation methods of gold nanoparticles, and then got following conclusion.1) The gelation phenomena of materials were used as the fixation method.The materials for fixation was mainly synthetic clay (Laponite XLG). Gold nanoparticles were also formed in the clay suspension, and fixed in the clay gel keeping the dispersion state. The dry membrane with gold-lay complex made by drying, and its structure could be controlled by the dry … More ing method.2) Effects of surface change of material for fixation on the dispersion state of gold nanoparticles were investigated by using silica (negative surface charge), and alumina and titania (positive surface charge) sol. The silica concentration could not control the state of colloidal gold. On the other hand, gold ion adsorbed on the surface of sol with positive charge. Nanoparticles were often observed to have triangle or hexagonal shape when the sol concentration for fixation was low, and then coagulated soon. The dispersion state was improved as the sol concentration for fixation increased.4) Gold nanoparticles can be prepared with the controlled particle size and fixed in materials as keeping the dispersion state, when Laponite XLG clay of PAANa polymer was used as the material for fixation.3) The gold nanoparticles were prepared in water-soluble polymer solution in comparison with clay gel. Gold ion was only adsorbed on poly 2-vinlpyridine (P2VP), which is a cationic polyelectrolyte. The anionic colloidal gold, however, was adsorbed on both P2VP and sodium polyacrylate (PAANa), although PAANa an anionic polyelectrolyte. The concentration and average molecular weight of polymer were found to affect the particle size and the formation rates of colloidal gold. Less

大多数功能材料都是由纳米粒子组成的，只有纳米粒子分散良好，才具有上级功能。然而，由于颗粒的凝聚倾向很强，因此有许多努力寻求纳米颗粒的分散方法和分散状态的固定方法。本课题以胶体金为纳米粒子，将其应用于催化、非线性光学器件、表面拉曼增强分析物质等功能材料中。研究了金纳米粒子的分散和固定方法，得到以下结论：1）利用材料的凝胶化现象作为固定方法，固定材料主要是合成粘土（Laponite XLG）。在粘土悬浮液中也形成了金纳米颗粒，并固定在粘土凝胶中保持分散状态。采用干燥法制备了金-层复合物干膜，其结构可通过干燥过程控制 ...更多信息 2）采用二氧化硅（表面带负电荷）、氧化铝和二氧化钛（表面带正电荷）溶胶，研究了固定材料的表面变化对金纳米粒子分散状态的影响。二氧化硅浓度不能控制胶体金的状态。另一方面，金离子以正电荷吸附在溶胶表面。当固定用溶胶浓度较低时，纳米颗粒通常呈三角形或六边形，然后很快凝固。以PAANa聚合物Laponite XLG粘土为固定材料，在保持分散状态的同时，可以控制金纳米粒子的粒径并将其固定在材料中; 3）与粘土凝胶相比，在水溶性聚合物溶液中制备金纳米粒子。聚2-乙烯基吡啶（P2 VP）是一种阳离子吸附剂，它对金离子有很强的吸附作用。阴离子胶体金吸附在P2 VP和聚丙烯酸钠（PAANa）上，虽然PAANa是阴离子胶体金。聚合物的浓度和平均分子量影响胶体金的粒径和形成速率。少