Effect of Ca/P ratio and milling material on the mechanochemical preparation of hydroxyapaptite

Abstract

The mechanochemical transformation of Ca(OH)(2)-(NH(4))(2)HPO(4) with different Ca/P ratios 1; 1.5; 1.67 and 1.75 was carried out for different periods of time from 10 min to 24 h in a horizontal vibration mill using steel and agate vials and balls. The phase transformations obtained at each milling stage were characterized by X-ray diffraction, infrared spectroscopy and transmission electron microscopy. Complete transformation to hydroxyapatite took place during the first 5 h of milling, for Ca/P ratios 1.5 to 1.7, when milling was carried out with steel vials and balls. The contamination was not significant for the periods of milling studied for both milling media.

Thermal Analysis on Hydroxyapatite Synthesis through Mechanochemical Method

“…1020 and 560 /cm regions (see Figure 4). The N-H does not appear significantly in either the range of 3300-2800 /cm or 1456-1400 /cm as Salas et al found [10], it may be the condition there and here are different like that people found carbonate systems in different regions between dry and wet processes.…”

Investigation of the Effectiveness of Dental Implant Osseointegration Characterized by Different Surface Types

“…The results of the investigation using EDS, after each treatment stage (at three points on the sample surface), are presented in Figure 2 and Table 1. The Ca/P ratio on the surface was 1.7, in which the mean ratios Ca/P = 1.67 [14,15] were indicated. The study of the processes involved in the formation of hydroxyapatite crystals on the titanium surface provides evidence that their inception depends on the number of surface hydroxyl groups present [4].…”

Magnesium Doped Hydroxyapatite through Mechanochemical Synthesis

“…There were several synthesis techniques that have been reported in synthesis Mg-doped HA such as precipitation [4], and sol-gel [7]. Mechanochemical method is a simple method in powder synthesis especially in a dry condition [8,91. This study reports the HA and Mg doped HA powders synthesized through dry mechanochemical method and the effect of M~~~ to the synthesized powder properties of HA.…”