Preparation Process for Fine Particles of Finely-Controlled Morphology using Emulsion as a Reaction Field

以乳液为反应场制备形貌精细颗粒的工艺

基本信息

批准号：
09650829
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：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

W/O/W emulsion (emulsion liquid membrane) system, which has been used for separation and concentration of metal ions, was utilized for preparation of fine particles.1. Preparation of Spherical Fine Particles of Rare Earth OxalateRare earth ions were transported from the external water phase into the internal water phase through the membrane, and well-defined spherical oxalate particles of 200-600 nm in diameter were obtained for almost all rare earths, Ce-Yb and Y. A simulation for rare earth ion transport through the membrane phase revealed that the particle size was controlled by the quantity of oxalic acid in each water droplet and also by the distribution of rare earth ions into the droplets, and this was confirmed experimentally. The control of the particle size was feasible by control of the feed rare earth concentration and size of the internal water droplets.2. Preparation of Calcium Carbonate Fine ParticlesCa ions were transported into the internal water droplets containing ca … More rbonate ions, and calcium carbonate particles were obtained. When the W/O emulsion was demulsified by Freeze-thaw method, micrometer-sized vaterite particles of hollow structure were obtained. Thus, by using W/O/W emulsion system, size, morphology, and also crystal structure could be controlled. In the case where phosphate ions were fed into the internal droplets, calcium hydroxyapatite fine particles were obtained.3. Preparation of Composite Oxalate ParticlesWhen binary metal ions are fed into the external phase, fine structure of the particles is expected to be controlled by controlling the transport of the ions through the membrane phase. As case studies, Sr-Pb oxalate and Co or Ni ferrite particles were prepared. As the former case, Sr oxalate particles containing finely dispersed nanometer-sized Pb oxalate were obtained. As the latter case, acicular Fe oxalate particles containing Co or Ni oxalate located near the particle surface were obtained, and were calcined to give Co ferrite or Ni ferrite acicular particles. Less

使用已用于分离和浓度的金属离子的W/O/W乳液（乳液液膜）系统用于制备细颗粒1。将稀土草酸酯地球离子的球形细颗粒的制备从外部水相传输到内部水相，并通过膜传输到内部水相，并在直径上获得200-600 nm的200-600 nm的明确定义的球形草酸颗粒，几乎所有稀有地球，CE-YB和Y的ce-yb和y均通过降低了量的液位量的量子，并且均具有量的液位，该量均可通过降低了粒子的含量。通过将稀土离子分布到液滴中，这是通过实验确认的。通过控制饲料稀土浓度和内部水滴的大小，对粒径的控制是可行的。2。将碳酸钙细颗粒离子的制备转运到含有Ca的内部水滴中，并获得了碳酸盐离子更多，并获得了碳酸钙颗粒。当通过冻干法拆除W/O乳液时，获得了千分尺小总图的空心结构疫苗颗粒。通过使用W/O/W乳液系统，可以控制尺寸，形态以及晶体结构。在供磷酸离子送入内部液滴中的情况下，获得羟基磷灰石钙细颗粒。3。当二元金属离子被馈入外相中时，复合草酸盐颗粒的制备预计将通过控制离子通过膜相的运输来控制颗粒的精细结构。作为案例研究，制备了SR-PB草酸盐和CO或Ni铁氧体颗粒。作为前一种情况，获得了含有细化的纳米尺寸PB草酸盐的SR-PB草酸盐颗粒。后一种情况，可获得位于粒子表面附近的含有CO或OXALATE的含有Fe的Oxalate颗粒，并计算出二氧化碳或Ni铁氧体的含糖颗粒。较少的