2016 Fiscal Year Final Research Report
Improvement of needless ice freezing method based on the model of ice formation on the biological magnetite in the tissue.
| Project/Area Number |
26630062
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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 |
Thermal engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Kirschvink Joseph 東京工業大学, 地球生命研究所, 教授 (80721258)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 生体内マグネタイト / 氷晶核 / 残留磁化測定 / 過冷却 |
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| Outline of Final Research Achievements |
Our theory holds that these weak magnetic fields could be inhibiting ice-crystal nucleation on the nanocrystals of biological magnetite (Fe3O4, an inverse cubic spinel) that are present in many plant and animal tissues by causing them to oscillate. Here we report that the addition of finely-dispersed magnetite to ultrapure water samples reduces the incidence of supercooling, as measured with multiple-thermocouple experiments conducted using a standardized freezing apparatus. The probability of achieving supercooling in water samples also decreases with increasing levels of ferromagnetic contamination as measured through superconducting moment magnetometry. We also report an interesting relationship between the volume change of ice and the initial degree of supercooling, that may indicate lower degassing during the crystallization of supercooled water.
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| Free Research Field |
環境熱工学
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