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

为了制作由离子聚合物凝胶制成的微泵，利用其在pH、温度、溶液盐浓度等方面的微小变化而产生的体积突变，用普通的光刻方法在玻璃板上制作了Ag/AgCl微电极，并在其上覆盖了一层离子聚合物凝胶膜。用两种不同的方法制备了离子聚合物凝胶膜：1)甲基丙烯酸与交联剂混合溶液自由基共聚合，涂布在微电极上，加热引发自由基共聚合；2)重氮树脂和聚丙烯酸溶液在微电极上进行光交联反应，在紫外光照射下制备。详细研究了制备离子聚合物薄膜的实验条件。通过连接电源来控制通过微电极的电流，研究了这些离子聚合物凝胶薄膜的溶胀和溶胀。另一方面，我们提出了一种自组织的非线性振荡系统来控制由多个微电极组成的微泵，这些微电极的电位是需要控制的。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工作在多个模式下，可以自动清除泵中停止的微小粉尘。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，以至于它们通常拒绝人工修复。用计算机仿真的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.