### Abstract

In the paper are presented the theoretical and experimental results concerning the influence of pH and temperature over the rate of the transformation: beta-whitlockite (beta-tricalcium phosphate) in hydroxyapatite (HAP). From the data of the kinetic studies were calculated the values of the rate constants and activation energies at pH = 8.5 - 12. Based on the obtained values for the activation energies it has been established that the process of transformation of beta-whitlockite in HAP could be described using a combined macrokinetic mechanism: transfer - mass transformation. The mathematical of the process has been elaborated and the numerical values of the constants from the mathematical model were determined. Based on the proposed model process simulations were made and the results show that the obtained values fit well with the experimental data, which confirms the model validation.

Original language | English |
---|---|

Pages (from-to) | 61-70 |

Number of pages | 10 |

Journal | Studia Universitatis Babes-Bolyai Chemia |

Volume | 3 |

Publication status | Published - Nov 2 2009 |

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### All Science Journal Classification (ASJC) codes

- Chemistry(all)

### Cite this

*Studia Universitatis Babes-Bolyai Chemia*,

*3*, 61-70.

}

*Studia Universitatis Babes-Bolyai Chemia*, vol. 3, pp. 61-70.

**Mathematical modeling for the crystallization process of hydroxyapatite obtained by precipitation in aqueous solution.** / Dejeu, Valentina R.; Réka, Barabás; Alexandru, Pop; Sára, Bogya Erzsébet; Agachi, Paul Şerban.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Mathematical modeling for the crystallization process of hydroxyapatite obtained by precipitation in aqueous solution

AU - Dejeu, Valentina R.

AU - Réka, Barabás

AU - Alexandru, Pop

AU - Sára, Bogya Erzsébet

AU - Agachi, Paul Şerban

PY - 2009/11/2

Y1 - 2009/11/2

N2 - In the paper are presented the theoretical and experimental results concerning the influence of pH and temperature over the rate of the transformation: beta-whitlockite (beta-tricalcium phosphate) in hydroxyapatite (HAP). From the data of the kinetic studies were calculated the values of the rate constants and activation energies at pH = 8.5 - 12. Based on the obtained values for the activation energies it has been established that the process of transformation of beta-whitlockite in HAP could be described using a combined macrokinetic mechanism: transfer - mass transformation. The mathematical of the process has been elaborated and the numerical values of the constants from the mathematical model were determined. Based on the proposed model process simulations were made and the results show that the obtained values fit well with the experimental data, which confirms the model validation.

AB - In the paper are presented the theoretical and experimental results concerning the influence of pH and temperature over the rate of the transformation: beta-whitlockite (beta-tricalcium phosphate) in hydroxyapatite (HAP). From the data of the kinetic studies were calculated the values of the rate constants and activation energies at pH = 8.5 - 12. Based on the obtained values for the activation energies it has been established that the process of transformation of beta-whitlockite in HAP could be described using a combined macrokinetic mechanism: transfer - mass transformation. The mathematical of the process has been elaborated and the numerical values of the constants from the mathematical model were determined. Based on the proposed model process simulations were made and the results show that the obtained values fit well with the experimental data, which confirms the model validation.

UR - http://www.scopus.com/inward/record.url?scp=70350370944&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70350370944&partnerID=8YFLogxK

M3 - Article

VL - 3

SP - 61

EP - 70

JO - Studia Universitatis Babes-Bolyai Chemia

JF - Studia Universitatis Babes-Bolyai Chemia

SN - 1224-7154

ER -