Optical and Magnetic Properties of a Heteroligand Complex of Gadolinium Stearate with Acetyl Acetone

Ivanin, S. N.; Buz’ko, V. Yu.; Goryachko, А. I.; Panyushkin, V. T.

doi:10.1134/s0036024421020114

Cited by 3 publications

(1 citation statement)

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“…The process of the thermal decomposition of hydroxyapatite samples obtained without additives and preliminarily dried at 100 • C can be divided into stages. The first is the removal of sorbed water [57,58] and carbon dioxide (1.25% 111 • C; 0.54% 162 • C), and the second is the decomposition of ammonium nitrate and hydroxyapatite carbonate with the elimination of CO 2 (16.19% at 353 • C). The peak on the DTG (Figure 4) curve at 248 • C is associated with the decomposition of ammonium nitrate.…”

Section: Discussionmentioning

confidence: 99%

Obtaining Polyvinylpyrrolidone Fibers Using the Electroforming Method with the Inclusion of Microcrystalline High-Temperature Phosphates

Papezhuk,

Ivanin,

Yakupov

et al. 2024

IJMS

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The results of the synthesis of microcrystalline calcium phosphates such as hydroxoapatite, pyrophosphate, and tricalcium phosphate are presented herein. The influence of the addition of polyvinylpyrrolidone (PVP) on the phase characteristics of the resulting high-temperature ceramic sample is considered. The X-ray results show that hydroxyapatite (HAp) consists of a Ca5(PO4)3(OH) phase, while the sample with the addition of polyvinylpyrrolidone contains β-Ca3(PO4)2 (65.5%) and β-Ca2P2O7 (34.5%) phases calcium phosphates (CPs). IR spectroscopy was used to characterize the compositions of the samples. An important characteristic of the obtained samples is the elemental Ca/P ratio, which was determined via energy-dispersive analysis. The data obtained are consistent with the composition of dental enamel apatites, namely, in the CPs (1.27) and HAp (1.40). SEM was used to study the morphology of the surfaces of hydroxyapatite particles. Polyvinylpyrrolidone polymer fibers were obtained using the electroforming method with the inclusion of CPs in the composition. The fibers were oriented randomly, and nanoscale hydroxyapatite particles were incorporated into the fiber structure. Solubility data of the HAp, CPs, and Fibers in a physiological solution at room temperature and human body temperature were obtained. The solubility of the resulting HAp turned out to be higher than the solubility of the CPs. In turn, the concentration of Ca2+ in a physiological solution of PVP composite fibers with the inclusion of CPs was lower than that in powdered CPs.

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Section: Discussionmentioning

confidence: 99%