Effect of a chelating agent at different pH on the spectroscopic and structural properties of microwave derived hydroxyapatite nanoparticles: a bone mimetic material

Abstract

Asparagusroot-like and scattered needle-like formation of hydroxyapatite nanoparticles under microwave irradiation.

Enzyme immobilisation on poly-l-lysine-containing calcium phosphate particles for highly sensitive glucose detection

“…The diffraction patterns of pLys-HAp composites are shown in Fig. 2(A) [43][44][45] The FT-IR spectra of a-pLys, a-pLys-HAp (20, 30 and 40 mg), 3-pLys and 3-pLys-HAp (20, 30 and 40 mg) are shown in Fig. 2(B).…”

Experimental studies on caffeine mediated synthesis of hydroxyapatite nanorods and their characterization

“…Besides, the weak peaks observed at 1419 and 1326 cm −1 attributed to the absorption bands of -CO , 3 2 signifying the existence of carbonate ions due to atmospheric CO 2 [31,32] . A weak band noticed at 2140 cm −1 in all the samples was assigned to (ѵ 3 ) asymmetric stretching of carbonate -CO , 3 2 ion impurity [5]. The small peaks located at 1025, 827 and 714 cm −1 attributed to the -PO .…”

“…In similar manner, effect of citric acid and EDTA on the morphology of HA nanoparticle have been proved. They also prevented agglomeration of nanoparticles as stabilizing agent [5]. As an organic modifier, caffeine acted produces new surfaces by breaking the bond between the neighboring atoms which lead to the development of smaller particles by controlling the driving force between the nanoparticles [33].…”

“…Effect of pH, temperature and organic modifiers influenced the morphology of HAp NPs [4]. The morphology parameter of hydroxyapatite very much influenced by chemical substances as surfactants such carboxymethyl cellulose (CMC) and ethylenediammine tetraacetic acid (EDTA) [5,6]. Previous reports have shown that the CTAB, Sodium dodecyl sulfate (SDS) and mixtures of surfactant CTAB are used as surfactants [7][8][9].…”

Synthesis and catalytic activity of Cu–Cr–O–TiO2 composites for the thermal decomposition of ammonium per-chlorate: enhanced decomposition rate of fuel for solid rocket motors

“…The crystallization temperature of Cu-Cr-O is 700 C, below which the compositions are in an amorphous state showing similar IR almost patterns for 300 C. No spectroscopic changes are observed due to the varying concentrations of TiO 2 on calcination either at 300 C or at 1050 C. One of the strong shoulders observed at wavenumber 1628 cm À1 is due to the n 2 bending mode of H-O-H in H 2 O. 28,29 The position of this band may vary by AE10 cm À1 depending on the host molecule to which H 2 O is attached. The absorption band appearing at 1414 cm À1 may be attributed to symmetric vibrations of surface hydroxyl groups.…”