Effect of ZrO₂, TiO₂, and Al₂O₃ Additions on Process and Kinetics of Bonelike Apatite Formation on Sintered Natural Hydroxyapatite Surfaces

Abstract

In this study, the ability to form bone‐like apatite on surface of both pure natural hydroxapatite (N‐HA) and natural hydroxyapatite containing 5 wt% of ZrO2 or TiO2 or Al2O3, sintered at 1300°C for 2 h and soaked in the simulated body fluid for different times, was studied. It has been found that the presence of β‐tricalcium phosphate in N‐HA + 5 wt% ZrO2 or TiO2 has promoted the precipitation of bone‐like apatite in the Zr or Ti poorest regions. By contrast, the presence of 5 wt% of Al2O3 did not induce any apatite precipitation on N‐HA sample surfaces.

Preparation and characterization of membrane supports for microfiltration and ultrafiltration using kaolin (DD2) and CaCO3

“…In order to decrease this cost and to evaluate our natural resources, many works have already been carried out [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Since the ceramic filters are generally constituted of a thick support (2,000 μm) and mono or multi-thin membranes (from 10 to 40 μm for each one), this work is then mainly focussed on the ceramic support elaboration rather than their deposited membranes.…”

Development and characterization of tubular composite ceramic membranes using natural alumino-silicates for microfiltration applications

“…Algeria is one of the countries in the world that have abundantly available raw materials, such as calcium carbonates (CaCO 3 )(CC), dolomite (CaCO 3 ·MgCO 3 ), bones (natural derived hydroxyapatite (HA): Ca 10 (PO 4 ) 6 (OH) 2 ), kaolin, feldspar and quartz. Many works have already been published for valorizing these native raw materials, for the production of advanced ceramics [1][2][3][4][5][6][7], ceramic membranes [8][9][10][11][12][13][14][15][16][17][18][19] and bioceramics [20][21][22][23][24][25][26][27]. In particular, in the membrane field the possibility of replacing the more expensive starting materials by cheaper raw materials to be used as a support (which constitutes about 99% of the filter mass) is significantly important from economic and energetic points of view.…”

Biomineralization-inspired synthesis of chitosan/hydroxyapatite biocomposites based on a novel bilayer rate-controlling model

“…Spectra did not include any peaks that were assignable to agarose [20,21], which indicated that agarose did not penetrate through to the reaction layer. In addition, carbonate bands at 1482, 1457, and 874 cm −1 were also detected, suggesting the HA crystallites that precipitated in the organic matrix were comparable in composition to minerals found in natural bone [22,23]. EDS results (Fig.…”