CD Tesis
Kinetika Kristalisasi Pada Sintesis Nanokomposit Fe3O4/Hap Menggunakan Metode Kopresipitasi
Fe3O4/HAp composite can be used as drug carriers for targeted drug delivery (TTD) applications. Aim of this research was to study the effect of temperature, the mol ratio of Fe3O4/Ca(NO3)2.4H2O, synthesis time of composite Fe3O4/HAp and to calculate the crystal growth of Fe3O4/HAp composite with Avrami equation. Fe3O4 was dissolved with 50 ml aquadest then added 34 mmol Ca(NO3)2.4H2O (100 ml aquadest) and stirred for 15 minutes and 20,35 mmol (NH4)2HPO4 (100 ml quadest). The pH of the solution was controlled at pH 11 with the addition of 25% NH4OH. The solution was heated at temperatures of 70, 80 and 90°C, and the mol ratios of Fe 10, 15, 20 and 25% with sampling intervals of 5, 20, 40, 60, 80, 100 and 120 minutes. The suspension was cooled and aged for 24 hours. The precipitate product was dried at 120°C for 24 hours and calcined for 3 hours at 400°C. Fe3O4/HAp powder analysis was carried out by XRD, BET, TEM and VSM analyzer.
From the XRD analysis, the increasing of synthesis temperature and the decreasing of the addition of Fe will increase the peak intensity of HAp. The crystal size of Fe3O4 at different temperature is 13,284; 14,134 and 13,71 are influenced by the shape of the composite particles and affected the surface area of particles 94,218; 71,17 and 77,079 m2/gr and the magnetic saturation value (Ms) 12,749; 14,446 and 12,743. TEM analysis shows that particles were uniform and dominated by rod shape. The longer the synthesis time, increasing the crystallinity of particles. Crystal growth follows the Avrami model with Avrami exponent, n = 0,13, and k = 0,78 and the activation energy (Ea) is 16,86 kJ/mol with minimum Error of 1,66%.
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