Hydrochloric Acid → Tricalcium Phosphate

Participants

Reaction Steps

Three of the samples were first exposed to a formulation containing 6.4N HCl and 0.15M ammonium persulfate for about one hour, resulting in microtexturing. Three other samples were first exposed to a formulation containing 8N HCl for about 24 hours, resulting in nanotexturing. The final three samples were not exposed to an etching formulation. All nine samples were vertically oriented on a Teflon fixture, and immersed in 1 L of a coating solution for about 16 hours at about 37° C. The coating solution included NaCl (150.2 mM), K2HPO4 (2.4 mM), MgCl2.6H2O (2.5 mM), CaCl2. 2H2O (6 mM), Tris(hydroxymethyl)aminomethane (17.5 mM), NaHCO3 (8 mM), 18 mL of 1N HCl, and water to create a total 1 L solution. The final coating solution had an initial pH of about 6.9 before samples were added. After 16 hours of the coating process, the samples were removed from the coating solution, rinsed three times in ethanol, and dried at ambient room conditions.

Provenance & Evidence