2002 Fiscal Year Final Research Report Summary
Investigation of Driving and Lubrication of Nanomachine by the Appliction of Mechanism in Bacterial Flagellar Motor
| Project/Area Number |
13650147
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAKANO Takashi Tokyo Institute of Technology, Graduate School of Information Science and Engineering, 大学院・情報理工学研究科, 助手 (00183517)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUKAWA Hiroshi Oosaka University, Faculty of Science, 理学部, 助教授 (20192750)
AIZAWA Shin-ich Teikyo University, Faculty of Science and Engineering, 理工学部, 教授 (50222451)
MOMOZONO Satosti Tokyo Institute of Technology, Graduate School of Science and Engineering, 大学院・理工学研究科, 助手 (70262300)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Flagellar Motor / Diffusive Double Layer / Lubrication / Nanomachine / PL ring / Tribology / Thermodynamics / Molecular force |
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| Research Abstract |
In this research, we investigated the driving and lubrication mechanism of bacterial flagellar motor in order to develop new guiding principle of nanomachine construction.
In nanoscale, different kind of physical effects has essential role on driving and lubrication mechanism of machines. Until now we do not know the guiding principle to construct nanomachine. Bacterial having flagellar motor sometimes called living nanomachine as it has motor, journal bearing universal joint and screw. Our main idea is knowing the mechanism of bacterial flagellar motor and utilizing these mechanism to the driving and lubrication system of nanomachines.
In a recent study, we estimated parameters in the tribology of the PL ring. By using theory of the classical hydrodynamic lubrication, we calculated load capacitance. Resulting load capacitance is order of 0.1pN( ×10^<-12>N ) and this values is not adequate to compensate driving force (0.5pN). Furthermore, intermolecular force between rod and journal becomes order of 10^2pN that is far bigger than load generated by driving force.
Thus, we concluded that new lubrication mechanism must be introduced to explain the behavior of PL ring. We proposed use of diffusive double layer as possible candidate of lubrication mechanism. We estimated the load capacitance generated by this effect and showed the adequate amount of repulsive force can be obtained by this mechanism.
We formulated new lubrication mechanism using the effects of diffusive double layer that is known as the origin of stability in hydrophobic colloidal solution. It is shown that this mechanism gives enough load capacitance to compensate the various forces between journal and rod.
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Research Products
(10 results)
