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

Research Project

Project/Area Number	05836032
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	非線形科学
Research Institution	TOKAI UNIVERSITY
Principal Investigator	IWAMOTO Kazutoshi TOKAI UNIVERSITY,SCHOOL OF HIGH-TECHNOLOGY FOR HUMAN WELFARE,DEPARTMENT OF MATERIAL SCIENCE AND TECHNOLOGY,ASSOCIATE PROFESSOR, 開発工学部, 助教授 (40114392)
Project Period (FY)	1993 – 1994
Project Status	Completed (Fiscal Year 1994)
Budget Amount *help	¥1,800,000 (Direct Cost: ¥1,800,000) Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000) Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywords	ionic polymer gel / swelling and shrinkage / micropump / photocrosslinking / chaotic oscillation / self-organization
Research Abstract	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.