Kinetics of conversion of brushite coatings to hydroxyapatite in alkaline solution

Daniel Navarro da Rocha, Marcelo H.Prado da Silva, José Brant de Campos, Rubens L.Santana Blazutti Marçal, Dindo Q. Mijares, Paulo Coelho, Leila Rosa Cruz

Research output: Contribution to journalArticle

Abstract

This work describes the kinetics of conversion of brushite coatings, produced by chemical deposition, to hydroxyapatite. The conversion was performed in alkaline solution at three temperatures: 50. °C, 55. °C, and 60. °C. The evolution of the transformation was assessed by X-ray diffraction, and the phase fractions were determined by Rietveld refinement. The Johnson-Mehl-Avrami equation was applied to the data in order to describe the conversion mechanisms. The value of 42. kJ/mol obtained for the conversion activation energy is of the same order as found in similar surface-controlled dissolution processes. The Avrami exponent was n = 3.5, which is consistent with an interface-controlled growth of three-dimensional HA crystals with decreasing nucleation rate.

Original languageEnglish (US)
JournalJournal of Materials Research and Technology
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Rietveld refinement
Durapatite
Hydroxyapatite
Dissolution
Nucleation
Activation energy
X ray diffraction
Coatings
Crystals
Kinetics
Temperature
dibasic calcium phosphate dihydrate

Keywords

  • Activation energy
  • Avrami equation
  • Conversion kinetics
  • Hydroxyapatite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Surfaces, Coatings and Films
  • Metals and Alloys

Cite this

Rocha, D. N. D., Silva, M. H. P. D., Campos, J. B. D., Marçal, R. L. S. B., Mijares, D. Q., Coelho, P., & Cruz, L. R. (Accepted/In press). Kinetics of conversion of brushite coatings to hydroxyapatite in alkaline solution. Journal of Materials Research and Technology. https://doi.org/10.1016/j.jmrt.2018.02.002

Kinetics of conversion of brushite coatings to hydroxyapatite in alkaline solution. / Rocha, Daniel Navarro da; Silva, Marcelo H.Prado da; Campos, José Brant de; Marçal, Rubens L.Santana Blazutti; Mijares, Dindo Q.; Coelho, Paulo; Cruz, Leila Rosa.

In: Journal of Materials Research and Technology, 01.01.2018.

Research output: Contribution to journalArticle

Rocha, Daniel Navarro da ; Silva, Marcelo H.Prado da ; Campos, José Brant de ; Marçal, Rubens L.Santana Blazutti ; Mijares, Dindo Q. ; Coelho, Paulo ; Cruz, Leila Rosa. / Kinetics of conversion of brushite coatings to hydroxyapatite in alkaline solution. In: Journal of Materials Research and Technology. 2018.
@article{613d6eb0b6e04b19bee6d026ae8d310d,
title = "Kinetics of conversion of brushite coatings to hydroxyapatite in alkaline solution",
abstract = "This work describes the kinetics of conversion of brushite coatings, produced by chemical deposition, to hydroxyapatite. The conversion was performed in alkaline solution at three temperatures: 50. °C, 55. °C, and 60. °C. The evolution of the transformation was assessed by X-ray diffraction, and the phase fractions were determined by Rietveld refinement. The Johnson-Mehl-Avrami equation was applied to the data in order to describe the conversion mechanisms. The value of 42. kJ/mol obtained for the conversion activation energy is of the same order as found in similar surface-controlled dissolution processes. The Avrami exponent was n = 3.5, which is consistent with an interface-controlled growth of three-dimensional HA crystals with decreasing nucleation rate.",
keywords = "Activation energy, Avrami equation, Conversion kinetics, Hydroxyapatite",
author = "Rocha, {Daniel Navarro da} and Silva, {Marcelo H.Prado da} and Campos, {Jos{\'e} Brant de} and Mar{\cc}al, {Rubens L.Santana Blazutti} and Mijares, {Dindo Q.} and Paulo Coelho and Cruz, {Leila Rosa}",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.jmrt.2018.02.002",
language = "English (US)",
journal = "Journal of Materials Research and Technology",
issn = "2238-7854",
publisher = "Elsevier Editora Ltda",

}

TY - JOUR

T1 - Kinetics of conversion of brushite coatings to hydroxyapatite in alkaline solution

AU - Rocha, Daniel Navarro da

AU - Silva, Marcelo H.Prado da

AU - Campos, José Brant de

AU - Marçal, Rubens L.Santana Blazutti

AU - Mijares, Dindo Q.

AU - Coelho, Paulo

AU - Cruz, Leila Rosa

PY - 2018/1/1

Y1 - 2018/1/1

N2 - This work describes the kinetics of conversion of brushite coatings, produced by chemical deposition, to hydroxyapatite. The conversion was performed in alkaline solution at three temperatures: 50. °C, 55. °C, and 60. °C. The evolution of the transformation was assessed by X-ray diffraction, and the phase fractions were determined by Rietveld refinement. The Johnson-Mehl-Avrami equation was applied to the data in order to describe the conversion mechanisms. The value of 42. kJ/mol obtained for the conversion activation energy is of the same order as found in similar surface-controlled dissolution processes. The Avrami exponent was n = 3.5, which is consistent with an interface-controlled growth of three-dimensional HA crystals with decreasing nucleation rate.

AB - This work describes the kinetics of conversion of brushite coatings, produced by chemical deposition, to hydroxyapatite. The conversion was performed in alkaline solution at three temperatures: 50. °C, 55. °C, and 60. °C. The evolution of the transformation was assessed by X-ray diffraction, and the phase fractions were determined by Rietveld refinement. The Johnson-Mehl-Avrami equation was applied to the data in order to describe the conversion mechanisms. The value of 42. kJ/mol obtained for the conversion activation energy is of the same order as found in similar surface-controlled dissolution processes. The Avrami exponent was n = 3.5, which is consistent with an interface-controlled growth of three-dimensional HA crystals with decreasing nucleation rate.

KW - Activation energy

KW - Avrami equation

KW - Conversion kinetics

KW - Hydroxyapatite

UR - http://www.scopus.com/inward/record.url?scp=85044425670&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044425670&partnerID=8YFLogxK

U2 - 10.1016/j.jmrt.2018.02.002

DO - 10.1016/j.jmrt.2018.02.002

M3 - Article

AN - SCOPUS:85044425670

JO - Journal of Materials Research and Technology

JF - Journal of Materials Research and Technology

SN - 2238-7854

ER -