Abstract: The present invention relates to the preparing methods of calcium phosphate ion solutions stabilized at a low temperature and calcium phosphate colloids which are made in the calcium phosphate ion solutions. The calcium phosphate colloids provide calcium phosphate dots, islands, or thin films by having them attached and grown on the solid surface, or calcium phosphate granules by having them grown in the solution.

Abstract: The present invention relates to the preparing methods of calcium phosphate ion solutions stabilized at a low temperature and calcium phosphate colloids which are made in the calcium phosphate ion solutions. The calcium phosphate colloids provide calcium phosphate dots, islands, or thin films by having them attached and grown on the solid surfaces, or calcium phosphate granules by having them grown in the solution.

Abstract: The present invention relates to a method for preparation of the supersaturated calcium and phosphate ions solution and a method for preparation of the thin film of calcium phosphate crystal on solid surface by using the said solution. Particularly, the lowered temperature and/or the use of suitable buffer system inhibit the nucleation of calcium phosphate in aqueous solution, and thereby highly supersaturated calcium and phosphate ions solution can be prepared. And the thin film of calcium phosphate crystal on solid surface can be prepared with rapidity and good quality of high reactivity and low crystallinity by using the said solution. Also the thin film of calcium phosphate crystal prepared according to the present invention has biocompatibility and can be applied as biomaterials.