Synthesis of Nanocrystalline Hydroxyapatite Nanorods via Hydrothermal Conditions

Abstract

The effect of Ca(NO 3 ) 2 ·4H 2 O and (NH 4 ) 2 HPO 4 primary solutions as the starting materials in the synthesis of a calcium phosphate phase was examined. Therefore, wet chemical reactions were investigated in solution at different temperatures by hydrothermal conditions aimed at hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , HAp) synthesis. The powders were investigated by XRD, SEM, FE-TEM, HRTEM, EDAX, SAED, and FTIR. It is found that the HAp have diameters of 25-50 nm and lengths of 120±30 nm with different morphologies. As a matter of fact, the hydrothermal method guarantees the production of HAp for different applications.

The effect of simulating body fluid on the structural properties of hydroxyapatite synthesized in the presence of citric acid

“…Therefore, many studies have been published on HAp preparation and investigation of its major properties. Namely, synthetic HAp can be successfully prepared using various experimental techniques, such as sol–gel (Sanosh et al 2009 ), spray pyrolysis (Cho et al 2016 ), solution combustion (Pratihar et al 2006 ), hydrothermal (Manafi and Rahimipour 2011 ), microwave (Ruban Kumar et al 2010 ), precipitation (Mobasherpour et al 2007 ) and extraction from natural resources (Akram et al 2014 ). Among them, sol–gel is an inexpensive method for preparing of the nano-sized HAp, having high crystallinity and purity, at low temperatures (Kalita et al 2007 ; Kaygili and Tatar 2012 ).…”

“Cleaning” the surface of hydroxyapatite nanorods by a reaction-dissolution approach

“…33 In contrast, the Raman spectrum of the treated HAP-NRs (Figure 2, spectrum b) only shows typical peaks from HAP crystals. Similarly, the FT-IR spectrum of the as-synthesized HAP-NRs (Figure S1 spectrum d) shows typical peaks from linoleic acid surfactants (1465 cm -1 , 1559 cm -1 , 2851 cm -1 , and 2923 cm -1 ) 11 while that of the treated HAP-NRs (Figure S1, spectrum a) doesn't. Peaks at the wavenumbers of 1423 cm -1 , 1462 cm -1 , and 1645 cm -1 in spectrum d are attributed to carbonate impurities in the HAP structure.…”

Urea-assisted synthesis of hydroxyapatite nanorods from naturally occurring impure apatite rocks for biomedical applications

“…Hydrothermal method has been exploited to prepare 1D nanosized HA, owing to its capability to induce 1D growth. [33][34][35][36] Therefore in the present study, we have used hydrothermal method to convert both CPP and CP into HA nanoparticles. Rod-shaped particles are elongated through [210] direction while forming needle-like HA crystals due to the high pressure and temperature during the hydrothermal treatment.…”