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Effect of Room-temperature, Calcined Eggshell Reactants on Synthesis of Hydroxyapatite

  • Kang, Tea-Sung (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Pantilimon, Cristian M. (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Lee, Sang-Jin (Department of Advanced Materials Science and Engineering, Mokpo National University)
  • Received : 2015.03.12
  • Accepted : 2015.05.18
  • Published : 2015.05.31

Abstract

Synthesis of hydroxyapatite (HA) was attempted through a room-temperature reaction of calcined eggshell with phosphoric acid. Ball-milled, calcined eggshell powder, which has a specific surface area of $31.6m^2/g$, was mixed with various concentrations of phosphoric acid at room temperature. The mixtures showed high reactivity and a vigorous exothermic reaction ; the reacted samples showed both $Ca(OH)_2$ and $CaHPO_4$ crystal phases. After heating at temperatures above $400^{\circ}C$, an HA crystal phase was observed in all samples. The calcined eggshell showed a pure CaO single phase, while the $Ca(OH)_2$ phase was only observed in the wet, ball-milled calcined powder. The degree of formation of the HA crystal phase increased as the phosphoric acid concentration and the heating temperature were increased. A mixture with 50 wt% phosphoric acid concentration showed a well-developed HA crystal phase after heat treatment at $800^{\circ}C$, while the formation of a more intensive amorphous phase was observed in the products of the room-temperature reaction.

Keywords

References

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