Comparison of crystallinity between natural hydroxyapatite and synthetic cp-Ti /HA coatings

Abstract

Commercial purity titanium (cp-Ti), and some of its alloys are important materials in the medical field because of their excellent biocompatibility and mechanical properties. Recently a simple chemical method to induce bioactivity in these inert metallic materials was reported. In this work, the biomimetic chemical process has been used to modify the surface of cp-Ti with the formation of a deposit layer of apatite (a calcium phosphate compound). The main purpose was to study the influence of heat treatment on changes in crystallinity in the deposited phases. X-ray diffraction analysis and scanning electron microscopy showed that the apatite coatings heat treated between 400 and 600 °C were less crystalline, similar to biological apatites. Upon heat treatment at temperatures above 700 °C, the apatite coatings appeared more crystalline, and were a mixture of hydroxyapatite, octacalcium phosphate and magnesium phosphate.

The role of calcium gluconate in electrochemical activation of titanium for biomimetic coating of calcium phosphate

“…The peaks at 2u 5 27.58 and 2u 5 368 are due to the Ti substrate. 13 The intensity of the peaks of Ti got decreased after biomimetic growth shows that the surface get covered with more apatite. Figure 9(a,b) shows the SEM micrographs of electrodeposited HAp coatings from the electrolytic bath containing 0 and 0.1 wt % of CaG after biomimetic growth in 1.5 Ca-SBF at two different magnifications.…”

“…[12][13][14][15] Two conditions, however, must be met to ensure effective biomimetic deposition: (1) supersaturation of calcium and phosphate in the solution [16][17][18][19][20] and (2) activation of Ti surface. 21, 22 Habibovic developed a two-step biomimetic deposition process, 23 in which an amorphous CaP layer was seeded on metal substrate before biomimetic coating.…”

Growth Performance and Health Status of Broiler Chickens Treated with Natural Kaolin

“…It was one of the analytical techniques that had been previously used to gather information on the composition and crystallinity of the bone mineral (Fook and Guastaldi, 2005;Petra et al, 2005;Fuchs et al, 2008;Nagy et al, 2008). Collected bone samples were prepared in accordance with Greene et al (2004).…”

Comparative Study of Enhancement of Corrosion Resistance of Stainless Steel Alloy by Plasma Spray Technique and Biomimetic Deposition

“…The polished steel samples were coated among pure hydroxyapatite coating using a plasma spray process (pressure blasting model: MEC 9182) at Metalizing Equipment Company Private Limited (MECPL), Jodhpur, India. The plasma spraying parameters used for pure hydroxyapatite coating has been shown in Biomimetic coating technique: In this technique, after acid etching, the samples were treated with alkaline treatment by using 5 M sodium hydroxide at 80 °C for 72 h in an electric oven followed by heat treatment at 600 °C as this was appropriate temperature to deposit the biological apatite [9][10][11]. After heating for 1 h in muffle furnace the specimens were then cooled to room temperature.…”