| Project/Area Number |
05452062
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物性一般(含基礎論)
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
OHDE Yoshihito Nagoya Inst.of Tech., Dep.of Engineering, Assist.Professor, 工学部, 助教授 (10024340)
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| Co-Investigator(Kenkyū-buntansha) |
TANZAWA Yasutoshi Nagoya Inst.of Tech., Dep.of Engineering, Assistant, 工学部, 助手 (60236776)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1994: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1993: ¥4,100,000 (Direct Cost: ¥4,100,000)
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| Keywords | Negative pressure / Berthelot method / Supercritical water / Cavitation / Inhomogeneous Nuclei / De-gassing / Raman spectroscopy / water / 準安定状態 / マラン分光 / 分子間相互作用 |
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| Research Abstract |
A metal Berthelot tube having 3 sapphire windows was made for Raman spectroscopy of water under negative pressure, but it yielded oniy -30 bar which was too low. The causes were investigated and three key findings were established. (1) An electrochemical criterion for selecting metals in a water Berthelot system is that metals which are corroded with water should not be used. Aluminum reacts with water to produce hydrogen gas which inhibited even generation of negative pressure. This criterion, however, was not applied to organic liquids. (2) The smaller the area of specimen chamber wall, the faster the rate of increase in negative pressure with temperature cycles. This is because the number of cavitation nuclei is proportionally smaller. (3) Pre-treatment for metals under supercritical water yielded negative pressure of around-120 bar in initial a few cycles. Without this it used to take 2 weeks for carrying out ca.1000 cycles. Further rise in negative pressure would be attained if the autoclave itself was degassed before the pre-treatment. The last statement is still being investigated.
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