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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Pristine and hydrated fluoroapatite (0001).

Xavier Torrelles1, Immad M Nadeem2, Anna Kupka3

  • 1Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, Barcelona 08193, Spain.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

Surface X-ray diffraction revealed fluoroapatite (0001) surface structure changes. Under humid conditions, water molecules and hydroxyl groups adsorb onto calcium and phosphorus atoms, respectively, altering the surface atomic arrangement.

Keywords:
fluoroapatite (0001)mineralogysurface X-ray diffractionsurface structurewater interface

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Crystallography

Background:

  • Fluoroapatite (FAp) is a key biomaterial, and its surface properties are critical for applications.
  • Understanding surface structure under varying humidity is essential for predicting material behavior.

Purpose of the Study:

  • To investigate the atomic structure of the fluoroapatite (0001) surface under quasi-dry and humid conditions.
  • To determine the relaxations and adsorption sites of water molecules on the FAp (0001) surface.

Main Methods:

  • Surface X-ray diffraction (SXRD) was employed to probe the atomic structure.
  • Analysis of crystal truncation rod (CTR) intensities provided detailed structural information.

Main Results:

  • The dry FAp (0001) surface exhibits bulk termination with atomic relaxations in the outermost layers.
  • The hydrated surface shows a disordered, partially occupied layer of water molecules (33% coverage) adsorbed on Ca atoms.
  • Hydroxyl groups (33% coverage) were found to be randomly bonded to the topmost P atoms.

Conclusions:

  • The fluoroapatite (0001) surface undergoes significant structural changes upon exposure to water.
  • Adsorption of water and formation of hydroxyl groups alter the surface termination and atomic arrangement, impacting surface reactivity.