Role of Hydroxide Precipitation Conditions in the Formation of Nanocrystalline BiFeO3

In this work, the physicochemical properties and biological activity of nanoemulsions prepared from paraffin oil and stabilized by nonionic surfactants as carriers of curcumin and cerium dioxide nanoparticles were studied. An analysis of the results showed that curcumin was incorporated into the oil droplets while cerium dioxide nanoparticles were adsorbed on the surface of oil droplets. The nanoemulsion droplet size did not exceed 100 nm. The absence of toxicity to mouse embryonic fibroblasts in vitro and after a single intraperitoneal injection to mice in vivo makes the nanoemulsions promising drug carriers for advanced biomedical applications.KEYWORDS nanoemulsions, drug delivery, curcumin, cerium dioxide nanoparticles. ACKNOWLEDGEMENTS This research has been supported by the Russian Science Foundation (project 22-63-00082).

Section: Resultsmentioning

confidence: 99%

Bioavailability of nanoemulsions modified with curcumin and cerium dioxide nanoparticles

Shirokikh¹,

Anikina²,

Zamyatina³

et al. 2023

“…The Y 0.95 Bi 0.05 FeO 3 composition was selected for the study. The crystallization temperature of pure bismuth orthoferrite is much lower than that of pure yttrium orthoferrite (∼490 • C [31] compared to ∼800 • C [32]). An increase in the amount of bismuth in a sample leads to a decrease in the crystallization temperature, and the crystalline phase in samples with a larger amount of bismuth will be observed already at lower temperatures, whereas the samples with a smaller amount of bismuth will still remain X-ray amorphous.…”

Section: Samplementioning

confidence: 89%

Photocatalytic properties of composites based on Y1-xBixFeO3 (0<x<0.15) nanocrystalline solid solutions with a hexagonal structure

Sokolova¹,

Проскурина²,

Данилович³

et al. 2022

Nanopowders of Y 1−x Bi x FeO 3 (x = 0, 0.05, 0.10, 0.15) solid solutions were obtained by coprecipitation of hydroxides with simultaneous sonication and subsequent thermal treatment of the precipitate in air at 800 • C for 1 min. in the annealing-quenching mode. The results of X-ray phase analysis showed the formation of nanocrystalline solid solutions with a structure of hexagonal yttrium orthoferrite. The average crystallite size increases from 4 to 10 nm with the increasing bismuth content in the solid solution. The influence of Y 3+ substitution for Bi 3+ in yttrium orthoferrite on the photocatalytic activity of Y 1−x Bi x FeO 3 nanopowders during the Fenton-like degradation of methyl violet under the visible light irradiation has been studied. The maximum reaction rate constant of 0.0197 min −1 was shown by the YFeO 3 nanopowder, which has the smallest crystallite size of ∼4 nm. KEYWORDS coprecipitation, yttrium orthoferrite, heat treatment, nanoparticles, photocatalyst, Fenton-like reactions ACKNOWLEDGEMENTS X-ray diffraction studies and elemental analyses of samples were performed employing the equipment of the Engineering Center of the

Section: Introductionmentioning

confidence: 99%

“…When a free impinging-jets microreactor is used to obtain precursors for the following synthesis of bismuth orthoferrite, as shown in [51][52][53], the formation of by-products that differ in composition from the stoichiometry of the target phase is almost completely excluded. Comparison of various apparatuses for coprecipitation of precursors were considered in [51], in particular, a microreactor with submerged jets. By use of different types of microreactors, the authors of [51] obtained predominantly single-crystal BiFeO 3 nanoparticles with a narrow size distribution and small average sizes of crystallites and particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of using different types of microreactors on the formation of nanocrystalline BiFeO3

Проскурина¹,

Абиев²,

Неведомский³

2023

The influence of the coprecipitation of bismuth and iron hydroxides in microreactors of various types on the formation of nanocrystalline bismuth orthoferrite during the heat treatment of the deposit was described. Free impinging-jets microreactor, microreactor with submerged jets, microreactor with intensively swirling flows were used. It was revealed that nanocrystalline bismuth orthoferrite with the smallest weighted average crystallite size of 12 nm is formed when a microreactor with tangentially swirling flows of reagent solutions is used for coprecipitation of hydroxides. The minimum size of BiFeO 3 crystallites according to transmission electron microscopy data is determined as 3-4 nm. KEYWORDS free impinging-jets microreactor, microreactor with submerged jets, microreactor with intensively swirling flows, nanocrystals, bismuth ferrite.