Crystal growth mechanisms associated with the macromolecules adsorbed at a growing interface - Microgravity effect for self-oscillatory growth - 2 (Ice Crystal 2) - 07.14.16
The Ice Crystal 2 investigation examines the growth rates, and stability, of ice crystals in supercooled water that contains antifreeze glycoprotein (AFGP).The growth of ice crystals in the supercooled water is controlled by the preferential accumulation of the AFGP molecules at the surface where ice and water interface in solution. The growth of ice crystals, and their adsorption of AFGP, is observed in the microgravity environment, free from the effects of gravity-based convection. Science Results for Everyone
Information Pending Experiment Details
OpNom: Ice Crystal 2
Yoshinori Furukawa, Ph.D., Hokkaido University, Sapporo, Japan
Etsuro Yokoyama, Gakushuin University, Tokyo, Japan
Naohisa Ogawa, Hokkaido Institute of Technology, Japan
Nada Hiroki, AIST, Japan
Gen Sazaki, Hokkaido University, Japan
Ken Nagashima, Hokkaido University, Japan
Akitoshi Asakawa, Hokkaido University, Japan
Shunichi Nakatsubo, Hokkaido University, Japan
Sponsoring Space Agency
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency
ISS Expedition Duration
March 2013 - September 2014
Ice crystal experiment was conducted in Increment18.
Ice crystal morphologies growing in a supercooled antifreeze protein (AFP) solution are drastically modified from those growing in a supercooled pure water, and the self-oscillation of growth is also observed. Based on the results of ground experiments, a model is proposed to explain these phenomena. It is called the 2-step reversible adsorption inhibition model, and must be confirmed by careful experiments. The crystal morphology may be strongly be affected by convection, which cannot be prevented under gravity. This effect can be prevented, and the effects of AFP obtained for ice growth under ideal microgravity experimental conditions in the Kibo Module of ISS.
Various images of ice crystals grown under supercooling temperatures are scheduled to be taken and data analyzed in hopes of clarifying the morphological changes and the time-sequence growth rates.
This research project illustrates the principle of the growth model for ice in the AFP solution, and opens the way for new research fields related to the fundamentals of crystal growth mechanisms controlled by biological macromolecules.
Operational Requirements and Protocols
Decadal Survey Recommendations
Information Pending^ back to top
^ back to top
Furukawa Y, Yokoyama E, Yoshizaki I, Tamaru H, Shimaoka T, Sone T. Crystal growth experiments of ice in kibo of ISS. International Journal of Microgravity Science and Application. 2014; 31(3): 93-99.
Ground Based Results Publications
NASA Image: ISS038E002242 - View of Ice Cell 2 installation.
+ View Larger Image
NASA Image: ISS038E002237 - View of the Ice Crystal 2 experiment in the Ryutai (fluid) Rack.
+ View Larger Image