| Project/Area Number |
15K13552
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Biological physics/Chemical physics/Soft matter physics
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| Research Institution | Kyushu University |
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Principal Investigator |
Yasushi Okumura 九州大学, 先導物質化学研究所, 准教授 (50448073)
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| Research Collaborator |
MATSUZAKI Yoshihito
OHO Takumi
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 電気浸透流ポンプ / ゼータ電位 / 流動電位 / 交流駆動 / 電気二重層 |
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| Outline of Final Research Achievements |
Rectifying mechanism of the oscillating electro-osmotic flow generated by application of AC electric field to the polymer membrane having many cylindrical pores was studied. It is known that the asymmetry is due to the asymmetry of the zeta potentials and electric-double layers on both surfaces of the membrane. In this study, we found that the hydrodynamic radius by flowing potential measurement and the zeta potential in the flow channel are asymmetric depending on the direction of water pressure application. Fluorescent dye ions were introduced as counter ions of the track etched film, and the distribution of counter ions was observed with a confocal laser scanning microscope. It was found that the electric double layer was thick in the hole on the membrane surface where the zeta potential was large, and the asymmetry of the flow path by this electric double layer was suggested as a cause of the rectification mechanism.
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