Fabrication of almina balloons using micro-capsulation method

研究了利用微胶囊化方法制备氧化铝球的方法，并成功地制备了直径为几十μ m、壁厚小于1 μ m的透明球。该方法的概要如下：将100 g 10%的聚苯乙烯在甲苯中的溶液和5 g浓度为约1 mol/kg的勃姆石溶胶以20：1的重量比量取到200 ml烧杯中，并通过搅拌器混合。将所得（W/O）乳液置于大量水中，并再次在乳化器中混合。在水溶液中得到聚苯乙烯包覆的勃姆石溶胶。在40 ℃下保持2天后，过滤，干燥和烧制，得到氧化铝球。氧化铝球的产量增加，如果聚苯乙烯外壳被删除前焙烧。

The fabrication of alumina balloon using micro-capsulation methods has been investigated, and succeeded in making a transparent balloons of diameter of several 10mum which have a wall thickness of less than 1mum. The outline of the process is as follows ;100g of 10% solution of polystirene in toluene and 5g of bohemite sol of about 1 mol/kg concentrations is measured into a 200ml beaker in the weight ratio of 20 : 1, and mixed by a homogeneizer. The resultant (W/O) emulsion is put in a large volume of water, and mixed a homogeneizer again. In gives bohemite sol encapsulated by polystirene in water. After keeping it for 2 days at 40ﾟC,filtrate, drying and firing, alumina balloons are obtained. The yield of alumina balloons increase if a polystirene crust is removed before firing.