2007 Fiscal Year Final Research Report Summary
Measurements for load capacitance of fluid film lubrication with diffused electric double layer
| Project/Area Number |
18560127
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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 |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
MOMOZONO Satoshi Tokyo Institute of Technology, Graduate School of Science and Engineering, Assistant Professor (70262300)
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| Co-Investigator(Kenkyū-buntansha) |
KYOGOKU Keiji Tokyo Institute of Thchnology, Graduate School of Science and Engineering, Professor (70153236)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Tribology / Nanotribology |
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| Research Abstract |
Hydrodynamic lubrication has the effect of reducing friction except at a low speed. Since molecular attractive force (i.e. van del Waals force) has been predominant effect in micro-nanoscopic system, hydrodynamic load capacitance has not been enough to avoid direct contact between surfaces in low velocity condition. "Stiction" is an example. It is important that development of new lubrication mechanism for MEMS in liquid. Head investigator proposed a new mechanism using electric double layer. It was simulated numerically as result that repulsive force has been taken effect at 10 to 100 nanometers gap between surfaces.
In this study, load capacitance has been measured by SPM (Scanning Probe Microscope), for influences of probe radius, applied voltage, kind and concentrations of ion and distance between surfaces for consideration of ability of nano-lubrication by electrical double layer.
SPM has been modified for measurements of normal and frictional force in liquid. A spherical epoxy resin has been pasted at the top of probe tip with sputter-deposited 10nm Au film. Ionic liquid, which is candidate for future lubrication, has been used. Characteristics of repulsive force measured at 10 to 150 mv voltage have been investigated.
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