FUNDAMENTAL STUDIES ON SYNCHRONIZATION IN A CHAOTIC SYSTEM AND CONTROL OF MICROPUMP

为了制造由离子聚合物凝胶制成的微泵，利用pH值、温度、溶液盐浓度等微小变化引起的体积突变，采用通常的光刻法在玻璃板上制作Ag/AgCl微电极，并覆盖一层离子聚合物凝胶膜。采用两种不同的方法制备离子聚合物凝胶膜；1)甲基丙烯酸与交联剂混合溶液自由基共聚，涂覆在微电极上，加热开始自由基共聚；2)重氮树脂与聚丙烯酸溶液浇铸在微电极上，进行光交联反应，紫外照射。详细研究了离子聚合物薄膜制备的实验条件。通过连接电源控制通过微电极的电流，研究了离子聚合物凝胶膜的溶胀和溶胀。用显微镜观察肿胀情况。另一方面，我们提出了一个非线性振荡系统中的自组织来控制微泵，该系统由许多微电极组成，并且需要控制这些微电极的电位。特别是混沌振荡系统中的自组织是有趣的，因为由这种系统控制的微泵与多模态一起工作，并且可以自动清除停在泵中的小灰尘。也就是说，它可能是一个自我修复系统，这对微型机器来说很重要，因为它们太小了，通常拒绝人工修复。采用计算机仿真方法对一个耦合混沌振荡系统进行了详细的研究。

For the creation of a mictopump made of ionic polymer gels, utilizing its abrupt volume change by a small variation in pH,temperature, salt concentration of solution, and so on, Ag/AgCl microelectrodes were made on a glass plates by the usual photolithograph method and were covered by an ionic polymer gel film. The ionic polymer gel film was prepered by two different methods ; 1) they were prepared by radical copolymerization of methacrylic acid and crosslinking reagent mixture solution, being spread on the microelectrodes and heated to start radical copolymerization, and 2) they were prepared by the photocrosslinking reaction of diazo resin and polyacrylic acid solution cast on the microelectrode and UV irradiated. Experimental conditions to prepare the ionic polymer films were studied in details. The swelling and deswelling of those ionic polymer gel films were studied by connecting electric power supply to control the electric current through the microelectrodes. The swelling was monitored with a microscope.On the other hand, we propose self-organization in a nonlinear oscillating system to control the micropump, which is made of many microelectrodes and potentials of these electrodes should be controlled. Especially self-organization in a chaotic oscillating system is interesting because the micropump controlled by such a system works with a multimode and can remove automatically a small dust stopped in the pump. That is, it could be a self-repairing system, which is important for micromachines because they are so small that they usually refuse an artificial repairation. A coupled chaotic oscilltion system was studeied in details with a computer simulation method.