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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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Atomically resolved calcium phosphate coating on a gold substrate.

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Researchers identified precursor phases in calcium phosphate (CaP) coatings during electrodeposition, revealing amorphous CaP, DCPD, and OCP. These nanometer-thick phases are crucial for understanding hydroxyapatite formation.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Nanotechnology

Background:

  • Electrodeposition of calcium phosphate (CaP) coatings mimics biomineralization, but precursor phase composition and thickness remain unclear.
  • Previous studies on CaP and metal electrodeposition used atom-probe tomography (APT), but not for CaP ceramics.

Purpose of the Study:

  • To investigate the CaP deposition process on a gold substrate.
  • To identify and characterize precursor phases in electrodeposited CaP coatings using advanced techniques.

Main Methods:

  • Atom-probe tomography (APT) for atomic-level analysis.
  • Transmission electron microscopy (TEM) for structural characterization.
  • Investigated CaP deposition on a gold substrate.

Main Results:

  • Detected a mixture of precursor phases, including amorphous CaP (ACP), dibasic calcium phosphate dihydrate (DCPD), and octacalcium phosphate (OCP).
  • These precursor phases are tens of nanometers thick and transiently form before hydroxyapatite (HAp).
  • Observed gradual increases in Ca/P atomic ratios, development of porosity, and changes in coating density.

Conclusions:

  • Atomic-resolved techniques like APT are valuable for identifying precursor phases in CaP coatings.
  • The transformation kinetics of precursor phases to HAp are slow enough for observation.
  • Understanding these precursor phases is key to controlling CaP coating properties for biomaterial applications.