1. Effect of pH variations on hardness and microstructure of nanohydroxyapatite/chitosan composites from limestone.
- Author
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Hartatiek, Hartatiek, Sektiono, M. W. A., Nasikhudin, Nasikhudin, Utomo, Joko, Fitriya, L. N., and Yudyanto, Yudyanto
- Subjects
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PH effect , *HARDNESS , *MICROSTRUCTURE , *LIMESTONE , *X-ray diffraction , *CHITOSAN , *COPRECIPITATION (Chemistry) - Abstract
NanoHydroxyapatite/chitosan (Cs) composite material has been successfully synthesized by the co-precipitation method. The Hydroxyapatite (HAp) was synthesized by utilizing limestone in Druju Malang, East Java, as a source of calcium using the co-precipitation method. XRD characterization resulted in HAp crystal size 23.13 nm, and EDX characterization results showed a Ca/P ratio of 1.64. Variations in the pH of the solution with values 4, 7, and 13 were carried out on the synthesis of nanoHAp/Cs composites. At pH 4 (acid) for samples with sintering showed a significant increase in hardness compared to those without sintering from 14.28 to 177.87 kg/mm2. Acid pH conditions increase the hardness of the composite significantly. Therefore, the choice of reaction pH is worth consideration. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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