Effect of temperature on morphology of triethanolamine-assisted synthesized hydroxyapatite nanoparticles

Abstract

Hydroxyapatite (HA) nanoparticles have been synthesized using ortho-phosphoric acid as the source of PO 4 3-ions, and calcium chloride, suitably complexed with triethanolamine, as the calcium source. The effect of temperature on the morphology of the product has been investigated. The chemical compositions of the samples have been established through Fourier transform infrared spectroscopy. This study reveals that A-type and B-type carbonate substitution are present in HA samples and the concentration of carbonate ions decrease with rise in temperature. Morphological analyses by TEM studies suggest that the average lengths and widths of the needle-shaped particles size increases with temperature up to 50°C, while a morphological change of the particles from needle to spherical shape is observed on raising the temperature above 50°C. This change in morphology has been assigned to the apparent solubility of HA at these temperatures, which has been studied by the determination of thermochemical properties of the reaction system by endpoint conductivity and electrophoretic mobility measurements.

Tailoring the morphological features of sol–gel synthesized mesoporous hydroxyapatite using fatty acids as an organic modifier

“…38 Some of the organic modiers such as citric acid, ethylenediamine tetraacetic acid, and trisodium citrates, Tween 20, and polyethylene glycol MW 600, cetyltrimethylammonium bromide (CTAB) were shown to control the size, shape, morphology and pores of the HAP particles during their synthesis. [39][40][41] Though many water-soluble organic compounds and aqueous extract of many plants have been used as a green chelating agent to modify the surface of the hydroxyapatite nanoparticles, such nanoparticles are also produced in various fascinating shapes and evaluated for various applications. For the rst time, we have used SA, a water-insoluble compound, to produce MPHA nanorods.…”

Composition-Tailoring of ZnO-Hydroxyapatite Nanocomposite as Bioactive and Antibacterial Coating

“…TEOA forms a strong complex with Zn 2+ and therefore can increase the stability of ZnO by increasing the ζ-potential . Specifically, TEOA as a strong organic base can induce the ionization of alcohols to form alkoxide ions and positively charged ammonium, which can be adsorbed on the surface of NPs and increase the ζ-potential Table summarizes the dispersions parameters of ZnO and HAp as a function of TEOA addition.…”

Biomaterials Obtained by Gelation

“…Typical precursors of HA sols involve a reaction of Ca(NO 3 ) 2 .4H 2 O with (NH 4 ) 2 HPO 4 , or H 3 PO 4 with Ca(OH) 2 or CaCl 2 .2H 2 O. Nano-HA particles obtained with CaCl 2 in the presence of triethanolamine as a complexing agent are illustrated in Fig. 1 from Puvvada et al (2013). Clearly, the morphology of these nanoparticles depends on the precipitation temperature.…”