A method of preparation of ultrallne CaCO3 particles in ordered systems, as in vesicle and Ancroemulsion, consisting of egg yolk phospholipid and water has been introduced. The size of CaCO3 grain was controlled by the content of egg yolk phospholipid and size of liposoms in the systems. It was found by experiment that vaterite is formed inside the doublle layer vesicles but caJcite is formed outside of the vesicles. A discussed of the cause of this difference has been giYen.
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