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| - Polymorph Discrimination of CaCO3 Mineral in an Ethanol/WaterSolution: Formation of Complex Vaterite Superstructures andAragonite Rods
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| - Polymorph discrimination of CaCO3 mineral has been easily realized in an ethanol/water mixed solution system under mild conditions without using any organic additives. The phase transition from a mixture of calcite and aragonite to pure aragonite, and then to almost pure vaterite, can be nicely captured by the choice of a suitable volume ratio of ethanol to distilled water in the present reaction system. This study provides an alternative polymorph switching route for CaCO3 mineral without using any additives and can even be scaled up as a green chemistry method for the industrial production of CaCO3 with different polymorphs.
- Polymorph discrimination of CaCO3 mineral has been easily realized in an ethanol/water mixed solutionsystem under mild conditions without using any organic additives. The phase transition from a mixtureof calcite and aragonite to pure aragonite, and then to almost pure vaterite, can be nicely captured by thechoice of a suitable ratio of ethanol to distilled water in the present reaction system. In addition, a complexself-assembly process for the formation of multilayered vaterite cakes in this binary solution system hasbeen proposed. The cakelike vaterite crystals with multilayered structures are porous with an averagepore size of 24.9 nm. The results demonstrated that such a binary reaction media could provide analternative and versatile tool for controlling the polymorph and nanostructures of inorganic mineralsthrough manipulating the thermodynamics and kinetics. This study provides an alternative polymorphswitching route for CaCO3 mineral without using any additives and can even be scaled up as a greenchemistry method for the industrial production of CaCO3 with different polymorphs.
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