FTIR, powder XRD, TEM and dielectric studies of pure and zinc doped nano‐hydroxyapatite

Abstract

Hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 or HAP, is an important bio-material, which is having application in bone implants and dentistry. In the present study, zinc doped nano-hydroxyapatite (Zn-HAP) was synthesized via chemical precipitation route using surfactant mediated approach. The doping of zinc was confirmed by EDAX. The powder X-ray diffraction (XRD) pattern revealed the typical hydroxyapatite pattern with broadening and extra peaks were observed for higher concentration. The average crystallite size was calculated by applying the Scherrer's formula to powder XRD pattern and was found in the range of 16 to 33 nm. The morphology of synthesized nano-particles was also confirmed using TEM. FTIR spectroscopy was used to confirm the presence of various bonds. The dielectric study was carried out at room temperature within the frequency range from 10 2 Hz to 10 7 Hz and the variations of dielectric constant with frequency of applied field as well as with the concentration of zinc were studied. It was found that as the concentration of zinc increased the dielectric constant increased. The variations of dielectric loss and a.c. conductivity with frequency of applied field were studied.

Structural and Biological Assessment of Zinc Doped Hydroxyapatite Nanoparticles

“…Furthermore, the band from around 1036 cm −1 is associated with the ] 3 bending mode [21,26]. There is also another band attributed to the HPO 4 2− found in the spectral range 870-880 cm −1 [21,24]. However, this one is almost impossible to distinguish due to the fact that it overlaps another vibrational band attributed to the CO 3 2− group [26].…”

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

“…This effect was also found for the Zn-doped hydroxyapatite coatings [30]. Tank et al [30] explained this effect as one in which stable interstitial protons form due to the attachment of oxygen of O-H or PO 4 3− groups, leading to the formation of water or HPO 4 2− . Han et al reported that the OH − groups found between 3600 and 3300 cm −1 can be a sign of the presence of the HAP phase [31].…”

“…In the case of doped coatings, it will be a competition between Mg 2+ and Ca 2+ to bond with anions, leading to a deficiency of Ca and a presence of water, and HPO4 2− is predicted. This effect was also found for the Zn-doped hydroxyapatite coatings [30]. Tank et al [30] explained this effect as one in which stable interstitial protons form due to the attachment of oxygen of O-H or PO4 3− groups, leading to the formation of water or HPO4 2− .…”

Structural evolution of Eu-doped hydroxyapatite nanorods monitored by photoluminescence emission

“…Hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 , (HA) is a bioceramic material, which constitutes 65% of the human bone mineral component [1]. The trivalent europium ion has been used as a luminescent probe in the investigation of crystallographic structure of activator centers, as well as a tool to probe the local symmetry and occupancy of cationic sites in apatite structures [2].…”