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The starting materials used in this investigation are analytical-grade (CH3COO)2Ca¡¤xH2O (99%, Aldrich Chemical company, Inc., USA) which is used as the Ca source, and H3PO4 (85%, Riedel-deHaen, Seelze, Germany) as the P source. After dissolving 0.015 mole (CH3COO)2Ca¡¤xH2O in different deionized water/anhydrous methanol (Merck) volume ratio, Poly (acrylic acid) (Mw 2000) (PAA, Aldrich Chemical company, Inc., USA) was added to the solution and adjusted the solution to the pH value of 9 using 5 M NaOH solution. Phosphoric acid (0.01 mole) was then dropped into the above solution and at the same time, the sodium hydroxide solution was used to keep the solution at pre-determined pH value throughout the entire synthesis process.
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