Abstract
It is demonstrated from the experiments using an advanced fast dynamic light scattering technique that the nucleation of CaCO3 in microgravity is 10000 times more difficult than in gravity. Ranging from low to high supersaturations, foreign bodies plays a more comprehensive role in nucleation than we expected, depending on the size and -contact angle- of the foreign bodies. It appears from our results that heterogeneous nucleation in microgravity becomes much more difficult due to the elimination of convection, and genuine homogeneous nucleation becomes possible.
