著者

Yoshinori FURUKAWA Ken NAGASHIMA Etsuro YOKOYAMA Shunichi NAKATSUBO Salvador ZEPEDA Izumi YOSHIZAKI Haruka TAMARU Taro SHIMAOKA Takehiko SONE Takao MAKI Asuka YAMAMOTO Toshiyuki TOMOBE Ken-ichiro MURATA Gen SAZAKI

出版者

The Japan Society of Microgravity Application

雑誌

International Journal of Microgravity Science and Application (ISSN:21889783)

巻号頁・発行日

vol.38, no.1, pp.380101, 2021 (Released:2021-01-31)

参考文献数

53

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Microgravity experiments on ice crystal growth in supercooled water without any effect of convection flow were carried out twice in Kibo of the International Space Station as projects called “Ice Crystal 1” and “Ice Crystal 2”. Many video movies recording the growth process of a single ice crystal were analyzed to clarify the pattern formation processes of single ice crystals and the impurity effect on ice crystal growth kinetics. In the Ice Crystal 1 project, ice crystals were grown in supercooled pure D2O and the pattern formation mechanism for the ice crystal was clarified on the basis of crystal plane-dependent growth kinetics between the basal face and the other crystallographic faces. In the Ice Crystal 2 project, ice crystals were grown in supercooled H2O containing a small amount of an antifreeze glycoprotein as an impurity. Growth enhancement and oscillation for the basal faces were observed for the first time, and their mechanisms were clarified on the basis of the crystal plane-dependent impurity effect of an antifreeze glycoprotein. The origin of the antifreeze function of antifreeze glycoproteins was ultimately explained in connection with the basic criterion for the pattern formation of a polyhedral crystal.