PREPARATION AND APPLICATION OF INORGANIC MICROCAPSULES

无机微胶囊的制备及应用

基本信息

批准号：
06650864
负责人：
HANO Tadashi
金额：
$ 1.47万
依托单位：
OITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650864/
关键词：
Microcapsule Inorganic microsphere Emulsion Liquid surfactant membrane Extraction Calcium silicate

项目摘要

In the present study, we applied the carrier-mediated penetration of ions to the preparation of inorganic microcapsules with the interfacial reaction method originally proposed by Nakahara. Two kinds of ion-carrier, cation and anion exchanger, were employed in organic solvents. The effects of preparation conditions on the rates of encapsulation and the surface state of inorganic capsules were examined to establish the reaction mechanism and to find the optimum preparation conditions. Most of the experiments were carried out for calcium silicate capsules. Some of the silicate capsules were prepared by using the salts of transition metals.The rates of encapsulation were affected by the factors which controlled the penetration rates of ionic species through oil phase. The increase in the carrier concentration and the dispersion rate of W/O emulsion into outer aqueous phase solution accelerated the encapsulation, whereas the surfactant concentration and oil-phase viscosity showed the reverse effects. The encapsulation rates increased by raising the concentration of inorganic compounds dissolved in both aqueous solutions. Based on these findings, the rate-controlling step of encapsulation were suspected to be the penetration through oil-phase film at the outer periphery of W/O emulsion drops. With the progress of shell formation, however, the transfer through inorganic shell may control the encapsulation processes. The state of capsulation was also affected considerably by preparing conditions. The increase of surfactant and salt concentrations were especially effective to improve the formation state of spherical capsules. The experimental methods to prepare the capsules made of different metals were proposed.

在本研究中，我们采用中原最初提出的界面反应方法，将载体介导的离子渗透应用于无机微胶囊的制备。在有机溶剂中使用两种离子载体：阳离子和阴离子交换剂。研究了制备条件对无机胶囊包封率和表面状态的影响，以建立反应机理并找到最佳制备条件。大多数实验是针对硅酸钙胶囊进行的。一些硅酸盐胶囊是用过渡金属盐制备的。包封率受到控制离子物质通过油相渗透速率的因素的影响。载体浓度和W/O乳液在外水相溶液中的分散速率的增加加速了包封，而表面活性剂浓度和油相粘度则表现出相反的效果。通过提高溶解在两种水溶液中的无机化合物的浓度来提高包封率。基于这些发现，包封的速率控制步骤被怀疑是渗透W/O乳液滴外周的油相膜。然而，随着壳形成的进展，通过无机壳的转移可以控制封装过程。封装状态也很大程度上受制备条件的影响。表面活性剂和盐浓度的增加对于改善球形胶囊的形成状态特别有效。提出了制备不同金属胶囊的实验方法。