1991 Fiscal Year Final Research Report Summary
Development of the ultracentrifuge system of condensed matter
| Project/Area Number |
01850011
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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 |
Applied materials
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| Research Institution | Kumamoto University |
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Principal Investigator |
MASHIMO Tsutomu Kumamoto Univ., Fac. of Eng., Assoc. Prof., 工学部, 助教授 (90128314)
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| Co-Investigator(Kenkyū-buntansha) |
SADAHIRO Takeshi Toshiba Tangaloy Co., Ltd., Chief, 研究所, 主幹
YAMAYA Susumu Toshiba Tangaloy Co., Ltd., Chief, 超高圧製品部, 部長
NISHIDA Minoru Kumamoto Univ., Fac. of Eng., Assoc. Prof., 工学部, 助教授 (90183540)
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| Project Period (FY) |
1989 – 1991
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| Keywords | Ultracentrifuge / Aedimentation / Diffusion / Condesed matter / Concentration / Material process / Acceleration field / Ultra-high speed rotation |
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| Research Abstract |
No extensive theoretical or experimental studies have been made of the diffusion phenomena of atoms or molecules induced by a centrifugal or gravitational field in condensed matter (sedimentation of atoms). The purpose of this research was the development of the generation system of an ultra-high speed accelerated field up to over 1, 000, 000 9 at high temperature for long time (ultracentrifuge system), to achieve the sedimentation of atoms in condensed matter. We have produced the ultra-high rotating system whose rotation rate is higher than 200, 000 rpm and whose outer specimen diameter is 40 mm. The system consists of the high-temperature air turbine motor with an oil float bearing and the titanium-alloy specimen holder, which can be heated up to over 200 degrees C. We realized the ultra-high rotation of greater than 220, 000 rpm, where the achieved maximum accelerated field was greater than 1, 000, 000 9. We have performed the ultracentrifuge experiment on the Au-In system, when the conditions were 160, 000 rpm in rotation rate (about 570, 000 g in acceleration), 110 degrees C in temperature and 8 hours in time duration, to examine the sedimentation. We observed the distribution of Au concentration by the SEM observation. On the other hand, one of the investigators (Mashimo) proposed the self-consistent theory of the sedimentation of atoms in condensed matter by the mean-field theory approximation. And the numerical analysis at equilibrium state of the sedimentation in two and three component systems was performed to discuss the applications of the sedimentation of atoms.
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