Influence of amorphous calcium phospahte on the properties of calcium phosphate based cements

Sahoo, Shubhashree (2014) Influence of amorphous calcium phospahte on the properties of calcium phosphate based cements. BTech thesis.



In the present study, the influence of amorphous calcium phosphate (ACP) on the properties ofƒnƒÑ- tricalcium phosphate (£\-TCP ) derived calcium phosphate cement (CPC) was investigated. Properties like setting time, formed apatite crystallite size and diametral tensile strength of ACP/£\-TCP based cement was studied. ACP powder was synthesized using rapid wet precipitation method from a precursor solution of calcium nitrate and ammonium dihydrogen phosphate. Synthesis of £\-TCP was carried out by the sold reaction between calcium carbonate and dicalcium phosphate anhydride at 1300 C followed by rapid quenching. £\- TCP and ACP powder were synthesized phase purity was analysed using x-ray diffraction (XRD) and Fourier transform infra red (FTIR) spectra. Initial and final setting times of the cement pastes were measured at 37 ¢XC in humidity controlled incubator. The phase composition and microstructure of the set cements were investigated after 10 days in SBF using X-ray diffractometry and scanning electron microscopy. Diametral tensile strength of the set CPCs was measured using Universal Testing Machine. The £\-TCP-based cement exhibited longer setting times, a higher strength as compared to ACP added CPC. Addition of ACP to the £\-TCP based cement resulted in shorter setting times, but larger macroporosity and diminished diametral tensile strength. Moreover, well entangled hydroxyapatite crystals were observed in the microstructure of £\-TCP based CPC.

Item Type:Thesis (BTech)
Uncontrolled Keywords:Amorphous calcium phosphate; Cements; crystallinity; microstructure; setting time; strength,; tricalcium phosphate
Subjects:Engineering and Technology > Ceramic Engnieering > Nanotechnology
Divisions: Engineering and Technology > Department of Ceramic Engineering
ID Code:6416
Deposited By:Hemanta Biswal
Deposited On:11 Sep 2014 14:10
Last Modified:11 Sep 2014 14:10
Supervisor(s):Dasgupta, S

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