The effects of tri-, di- and mnocarboxylate on the growth of nanoparticles of calcium oxalate (CaOxa) were first investigated in liposome system. Sodium acetate (NaAc) only induced calcium oxalate monohydrate (COM), while sodium tartrate (Na_2tart) and sodium citrate (Na_3cit) could induce calcium oxalate dihydrate (COD) with a prefernetial growth of (213) crystal face. The promotion effectiveness to COD followed this order: Na_3cit > Na_2tart > NaAc.
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