| Project/Area Number |
59860019
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
1984 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1985: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1984: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Zeta potential / Electrokinetic effects / Microelectrophoresis / Papermaking / Neutral papermaking / Alkaline papermaking / 水処理 |
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| Research Abstract |
1. The distribution curves of observed particle velocities in microelectrophoresis were found to be asymmetrical about the cell center because the electrical characters between upper and lower cell walls differed from each other through the sedimentation of particles. The conventional method in which the measurements are carried out just at the upper stationary level often results in a serious error. If it is unavoidable to use the cell in a horizontal arrangement, the particle concentration must be as low as possible.
2. Although the lateral arrangement of cell is ideal in principle, it has more convective disturbance than the horizontal arrangement under the conventional microscope illumunation.
3. The convection was considerably inhibited by the use of cold-mirror which transmits the heat and reflects the visible light, and cold-filter which absorbs the heat and transmits the visible light.
4. The microscope with these mirror and filter was made and this was a good devices for measuring the electrophoretic velocities of particles.
5. The apparatus equipped with constant current source, automatic polarity conversion of electrode, automatic temperature read-off function etc. and also microcomputer for calculation of zeta potencial was made.
6. TV camera and CRT are conveniently applied for measurements of zeta potential, but it was difficult to distinguish the particles at the focal plane from the back and forth particles under a conventional illumination. When a high resolution camera and a dark background illumination for microscope were employed, the measurements of particle movement were well done and the accuracy of a result was improved very much.
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