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The dissolution of single crystals of hydroxyapatite in citric and lactic acids

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Abstract

The dissolution of hydroxyapatite single crystals is highly anisotropic. Parallel to the c-axis the dissolution is fast, while perpendicular to the c-axis dissolution is negligible. In 5 M citric acid solutions at 37°, the acid penetrates into the single crystals parallel to the c-axis with a velocity of approximately 60 nM/sec. Scanning electron microscopy shows that the single crystals are twisted along the c-axis. Both the details of the dissolution behaviour as well as the surface morphology observed indicate the presence of screw dislocations in the single crystals with the dislocation line parallel to the c-axis.

Résumé

La dissolution de monocristaux d'hydroxyapatite est hautement anisotropique. La dissolution est rapide le long de l'axe c, alors que perpendiculairement à l'axe c cette dissolution est négligeable. Dans des solutions d'acide citrique 5 M à 37°, l'acide pénètre dans le monocristal parallèlement à l'axe c à une vitesse d'environ 60 nM/sec. La microscopie électronique par balayage montre que les monocristaux sont torsadés le long de l'axe c. L'étude du comportement de dissolution ainsi que la morphologie de surface observée indiquent l'existence de dislocations en «pas de vis» dans les monocristaux avec une ligne de dislocation parallèle à l'axe c.

Zusammenfassung

Die Auflösung von einzelnen Hydroxyapatitkristallen ist stark heterotrop. Parallel zur C-Achse findet sie rasch statt, ist jedoch senkrecht zur C-Achse unbedeutend. In 5 M Citronensäurelösungen und bei 37° dringt die Säure in die einzelnen Kristalle parallel zur C-Achse mit einer Geschwindigkeit von ungefähr 60 nmol/sec ein. Raster-Elektronenmikroskopie zeigt, daß die einzelnen Kristalle entlang der C-Achse abgedreht sind. Sowohl die Einzelheiten des Verhaltens bei der Auflösung, als auch die beobachtete Oberflächenmorphologie weisen auf eine schraubenförmige Verlagerung in den einzelnen Kristallen hin, wobei die Verlagerungslinie parallel zur C-Achse verläuft.

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Authors and Affiliations

  1. Centre for Medical Electron Microscopy, University of Groningen, Groningen, The Netherlands

    W. L. Jongebloed

  2. Lab. of Chemical Technology, Technical University of Delft, Delf, The Netherlands

    P. J. van den Berg &  J. Arends

  3. Lab. for Materia Technica, University of Groningen, Antillenstraat 11-13, Groningen, The Netherlands

    P. J. van den Berg &  J. Arends

Authors
  1. W. L. Jongebloed
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  2. P. J. van den Berg
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  3. J. Arends
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Jongebloed, W.L., van den Berg, P.J. & Arends, J. The dissolution of single crystals of hydroxyapatite in citric and lactic acids. Calc. Tis Res. 15, 1–9 (1974). https://doi.org/10.1007/BF02059038

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  • DOI: https://doi.org/10.1007/BF02059038

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