On the Formation of Hydroxyapatite Nano Crystals Prepared Using Cationic Surfactant

Abstract

Being a major constituent of hard tissues found in humans, synthetic hydroxyapatite (HA) as a substitute to natural bone and teeth is gaining importance. In particular, nano hydroxyapatite is expected to impart considerably superior properties. The current research focuses on identification of mechanism of the formation of HA nano-crystals during its preparation when surfactant nano reactors are used for their nucleation and growth. In addition to having a rod-shaped morphology, high resolution electron microscopy has revealed the presence of 2-5 nm crystals within individual particles of HA. The HA particles were not completely hollow, rather nano sized spherical pores of about 5 nm size, have been observed in TEM. These pores are suggested to have formed due to evolution of gases during processing.

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

“…The analysis shows round bright patches (holes) distributed randomly in all the particles (Figure b) mostly of size between 11 and 41 nm (Figure 9e), explaining the large surface area obtained from BET analysis. However, even though many studies have reported the presence of sphere‐like nanopores in synthetic apatite, in our case the nanopores are studied in a natural apatite as well as for lamellar aspect. The metal deposition on the particle surface was in a well‐defined nanosphere shape (Figure c) and the Pd nanoparticles were distributed with a mean size of 11.81 nm, as shown in Figure f.…”

Characterization of Sol-Gel Derived Calcium Hydroxyapatite Coatings Fabricated on Patterned Rough Stainless Steel Surface

“…The characteristic calcium hydroxyapatite absorption bands in the range of 1100-950 cm −1 were clearly visible [32]. Strong bands located at 1035 and 1090 cm −1 resulted from the ν 1 symmetric P-O stretching vibrations in PO 4 3− [32,33]. The broad band visible in the range of 3600-3300 cm −1 is associated with O-H stretch vibrations and attributed to adsorbed water [29,32,34].…”

Synthesis and characterization of hydroxyapatite/alumina ceramic nanocomposites for biomedical applications

“…The FTIR spectra of pure HAp and HAp−Al 2 O 3 composite are shown in figure 3. The IR band peaks around 3745 and 633 cm −1 correspond to asymmetric OH stretching vibrations [19]. The peaks at 3564 and 3572 cm −1 related to the stretching modes of surface hydroxyl group and absorbed water, respectively [20].…”