著者

Yoshinori FURUKAWA Etsuro YOKOYAMA Izumi YOSHIZAK Haruka TAMARU Taro SHIMAOKA Takehiko SONE

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.31, no.3, pp.93, 2014-07-31 (Released:2020-05-14)

参考文献数

23

被引用文献数

1

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Microgravity experiments for ice crystal growth were conducted twice in the Japan Experiment Module “Kibo” of the International Space Station. Experimental cartridges newly developed for each experiment were transported to the space station and installed in the SCOF facility. All of the experiments were possibly could be performed by using a tele-control system on the ground. Crystal patterns during free growth of ice crystals in supercooled water were observed by using specially designed interference microscopes. Experiments were carried out for ice crystal growth in supercooled pure water (D2O) and in a supercooled solution (H2O) of antifreeze glycoprotein. Based on analysis of moving images, the pattern formation mechanism of ice dendrites in pure water and the fluctuation mechanism of growth rates in protein solution are discussed.

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.