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Microscopic Structure Control for Composite Fine Particles by Using Microscopic Reaction Field

利用微观反应场控制复合细颗粒的微观结构

基本信息

批准号：
11650781
负责人：
HIRAI Takayuki
金额：
$ 1.86万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650781/
关键词：
W O W Emulsion Emulsion Liquid Membrane Extraction Fine Particles Metal Oxalate Hydroxyapatite Phosphor Particles Size and Morphology Control フェライト

项目摘要

W/O/W emulsion (emulsion liquid membrane; ELM) system has been used for separation and concentration of metal ions. In this study, the ELM system was utilized for preparation of fine particles, aiming to control their size and morphology, by using the micrometer-sized internal water droplets as size-restricted reaction area. The interface between the organic membrane phase and the internal water phase gives hydrophobia reaction sites for the) particles formation, and template effect for particle formation may be expected.1. Preparation of Calcium Phosphate Particles Calcium ions were transported from the external water phase into the internal water phase through the organic membrane phase, and well-defined spherical, micrometer-sized phosphate particles were obtained, mainly consist of calcium hydroxyapatite, by the reaction with phosphate anions in the internal phase. Alumina-containing β-TCP (calcium triphosphate) spherical particles were also prepared, by the addition of aluminum ions in the internal phase, and by the calcination of the resulting composite phosphate particles.2. Preparation of Phosphor Fine Particles Rare earth ions are transported into the internal phase and oxalate particles were prepared. When both Y and Eu ions were transported, composite Y-Eu oxalate particles were obtained, which give Y_2O_3:Eu^<3+> particles. The size of the oxide particles could be controlled by changing the ELM system employed. The Y_2O_3:Eu^<3+> particles showed red emission by excitation with UV light.

W/O/W型乳状液膜（emulsion liquid membrane; ELM）体系已被用于分离和浓缩金属离子。在这项研究中，ELM系统用于制备细颗粒，旨在控制其尺寸和形态，通过使用微米级的内部水滴作为尺寸限制的反应区域。有机膜相和内水相的界面为颗粒的形成提供了疏水反应位点，并且可以预期颗粒形成的模板效应.磷酸钙颗粒的制备钙离子通过有机膜相从外水相转移到内水相中，并通过与内相中的磷酸根阴离子反应，获得主要由羟基磷灰石钙组成的轮廓分明的球形微米级磷酸盐颗粒。通过在内相中添加铝离子，并对所得复合磷酸盐颗粒进行煅烧，制备了含氧化铝的β-TCP（三磷酸钙）球形颗粒.荧光粉微粒的制备稀土离子迁移到内相中，制备出草酸盐微粒。当Y和Eu离子同时迁移时，得到Y-Eu草酸盐复合粒子，即Y_2O_3：Eu^<3+>粒子。氧化物颗粒的尺寸可以通过改变所采用的ELM系统来控制。在紫外光激发下，Y_2O_3：Eu^<3+>颗粒呈现红色发光。