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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，我们将载流子介导的离子渗透应用到无机微胶囊的制备中，这种方法最初是由Nakahara提出的。在有机溶剂中使用了阳离子载体和阴离子交换剂。考察了制备条件对无机胶囊包封率和表面状态的影响，以确定反应机理和最佳制备条件。大部分实验是针对硅酸钙胶囊进行的。利用过渡金属盐制备了部分硅酸盐胶囊，其包封率受控制离子物种通过油相的渗透速率的因素的影响。载体浓度和W/O乳状液在外水相溶液中分散率的增加加速了包埋速度，而表面活性剂浓度和油相粘度则相反。包封率随两种水溶液中无机化合物浓度的增加而增加。根据这些发现，包埋的速度控制步骤可能是W/O乳滴外周的油相膜的渗透。然而，随着壳层形成的进展，通过无机壳层的转移可能会控制包覆过程。制备条件对包埋状态也有较大影响。表面活性剂和盐浓度的增加对改善球形胶囊的形成状态尤为有效。提出了用不同金属制成胶囊的实验方法。