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Two Step Porosification of Biomimetic Thin-Film hydroxyapatite/alpha-tri Calcium Phosphate Coatings by Pulsed Electron Beam Irradiation

Two Step Porosification of Biomimetic Thin-Film hydroxyapatite/alpha-tri Calcium Phosphate Coatings by Pulsed Electron Beam Irradiation

Bryan W Stuart, James W Murray, David M Grant

Sci Rep. 2018 Sep 28;8(1):14530.

PMID: 30266971

Abstract:

Here we show a new and effective methodology for rapid/controllable porosification of thin-film ceramics, which may be applied in medical devices/electronics and membrane nano-filtration. Dense hydroxyapatite applied to Ti6Al4V by plasma-assisted PVD was electron-beam irradiated to induce flash melting/boiling. Deposited coatings contained amorphous and nano-crystalline/stoichiometric hydroxyapatite (~35 nm). Irradiation (voltages 13-29 kV) led to ablation (up to 45% mass loss) and average/maximum pore areas from (0.07-1.66)/(0.69-92.53) μm2, mimicking the human cortical bone. Vitrification above 1150 °C formed (~62-30 nm) crystallites of α-Tri Calcium Phosphate. Unique porosification resulted from irradiation-induced sub-surface boiling and limited thermal conductivity of hydroxyapatite, causing material to expand/explode through the more quickly solidified top surface. Commercially applicable, roughened Ti6Al4V exacerbated the heating and boiling explosion phenomenon in certain regions, producing an array of pore sizes. Scaffold-like morphologies were generated by interconnection of micron/sub-micron porosity, showing great potential for facile generation of a biomimetic surface treatment for osseointegration.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7758874-A	α-tri-Calcium phosphate		7758-87-4	Price

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