| Project/Area Number |
05836014
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
非線形科学
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| Research Institution | Nagoya University |
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Principal Investigator |
YOSHIKAWA Kenichi Graduate School of Human Informatics, Nagoya University, Professor, 大学院・人間情報学研究科, 教授 (80110823)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Self-oscillation / BZ Reaction / Active Transport / Artificial Muscle / Nonlinear / Nonequilibrium / Interfacial tension / Chemo-Mechanical Coupling / エネルギー直接変換系 / 非線形現象 / ケモメカニカル / 化学振動 / 界面張力振動 / 化学モーター / マランゴニ効果 |
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| Research Abstract |
Living organisms convert chemical energy directly into site-directed mechanical energy. On the other hand, the modern technology on "chemical engine" picks up the mechanical energy from chemical energy through the generation of heat. The aim of the present research is to realize the direct energy conversion from chemical energy into site-directed mechanical motion. During the research of the past two years in this project, we have succeeded in constructing the following two different experimental systems, being capable of the direct energy conversion.
1. Self-movement of an oil-water system induced by chemically-driven Marangoni instability is studied. Depending on the shape of the vessel and amount of oil and water solutions, various modes of movement are generated, such as random, rotational and amoeba-like motions. The most significant finding in this system is the realization of spatially directed mechanical movement. The mechanism of such chemomechanical transduction is discussed in relation to the temporal imbalance of the interfacial tension due to the nonlinear oscillation at the interface.
2. We have found that a periodic change of the surface tension is generated at air/water interface, when the water phase is Belousov-Zhabotinsky (BZ) medium. It has been shown that the difference of the surface activity of the iron-catalyst between [Fe (phen)_3]^<3+> and [Fe (phen)_3]^<2+> is the driving force of this rhythmic phenomenon. We also discovered a rhythmic phenomenon for an oil/water system, where the oil phase contains an ester and the water phase is an alkaline solution. These results indicate a new field of research toward the realization of chemo-mechanical coupling based on the idea of nonlinear dynamics.
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