Synthesis of Calcium Fluoride Nanoparticles in a Microreactor with Intensely Swirling Flows

Абиев, Р. Ш.; Здравков, А. В.; Kudryashova, Yu. S.; Alexandrov, A. A.; Kuznetsov, S. V.; Федоров, П. П.

doi:10.1134/s0036023621070020

Cited by 19 publications

(10 citation statements)

References 45 publications

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“…Note that Equation (10) qualitatively coincides with Equation (11). Similarly to Equation (11), for turbulent flow following relation could be found:…”

Section: Experimental Study Of Micromixing In Two-step (Multistage) M...supporting

confidence: 67%

“…According to the classical point of view, large-scale eddies, as a result of the excess of inertia forces over the viscous forces, break up into medium-scale eddies, then into smaller and smaller ones until the minimum scale of turbulence according to A.N. Kol-a-Microreactor with free impinging jets [7]; b-Microreactor with pulsating flow type apparatus (micro-PFA) [8]; c-Microreactor with swirled flows (micro-vortex jet apparatus, micro-VJA) [9]; d-Microreactor with impinging swirled flows (counter-current axial velocities) (micro-VJA-ISF-CC) [10]; e-Two-step (multistage) microreactor with swirled flows (two-step/multistage micro-VJA) [11]; f-Microreactor with impinging swirled flows (codirectional axial velocities) (micro-VJA-ISF-CD) [12].…”

Section: Macro- Meso-and Micromixing Scalesmentioning

confidence: 99%

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Micromixing and Co-Precipitation in Continuous Microreactors with Swirled Flows and Microreactors with Impinging Swirled Flows

et al. 2023

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One of the promising methods for process intensification for micromixing, co-precipitation, and crystallization in continuous reactors is the use of vigorous vortices. A combination of the high intensity of the kinetic energy input with the small volume of the micromixing volume allows to concentrate the energy dissipation rate up to 104 W/kg and more. As the embodiment of such an idea, four new types of microreactors with intensively swirled flows were created and studied as a tool for continuous co-precipitation and crystallization. A correlation between residence time and segregation index was found: the smaller residence time, the higher energy dissipation rate and better quality of micromixing. A method for the synthesis of oxides of a number of transition metals in microreactors with intensively swirled flows with subsequent thermal treatment of co-precipitation products has been developed. This method was used to obtain ensembles of nanosized particles of zirconium oxides, as well as calcium and strontium fluorides. In comparison with the currently widely used hydro- and solvothermal methods, the proposed method has high productivity (around 10 m3/day for lab scale device), can significantly reduce the duration of the process, provides low energy consumption, does not require a large number of labor-intensive operations, is technologically advanced and easily scalable.

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“…Note that Equation (10) qualitatively coincides with Equation (11). Similarly to Equation (11), for turbulent flow following relation could be found:…”

Section: Experimental Study Of Micromixing In Two-step (Multistage) M...supporting

confidence: 67%

Section: Macro- Meso-and Micromixing Scalesmentioning

confidence: 99%

Micromixing and Co-Precipitation in Continuous Microreactors with Swirled Flows and Microreactors with Impinging Swirled Flows

et al. 2023

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“…The synthesis methods developed are scalable 51 and can be used to obtain nanoparticles in industrial volumes. The nanoparticles obtained can be used to increase the efficiency of solar panels, 35,52–56 in anticounterfeiting, 57 in the production of thin optical films for anti-reflective protective coatings on glass, 58 in 2D/3D monitors, 59 in bioimaging, 33 pressure and temperature sensors, 60 and in plastic sorting.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of SrF₂:Yb:Er ceramic precursor powder by co-precipitation from aqueous solution with different fluorinating media: NaF, KF and NH₄F

et al. 2022

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“…phases that exist within some temperature range are NaLaF 4 [47] and KCaF 3 . [48,49] The R 3+ ionic radius decreases along the lanthanide series (lanthanide contraction), [50] which is responsible for the stability bounds of the LiRF 4 crystal structure. The crystal structures of LiRF 4 compounds comprise irregular eight-vertex {RF 8 } polyhedra connected by edges and {LiF 4 } tetrahedra.…”

Section: Discussionmentioning

confidence: 99%

“…Examples of such phases that exist within some temperature range are NaLaF 4 [ 47 ] and KCaF 3 . [ 48,49 ]…”

Section: Discussionmentioning

confidence: 99%

Thermal Stability of LiRF₄ (R = Gd, Tb) Compounds

Федоров

Alexandrov

Кораблева

et al. 2023

Cryst. Res. Technol.

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LiGdF4 and LiTbF4 single crystals are grown by the Bridgman–Stockbarger method from the nonstoichiometric melt comprising 32 mol% RF3 (R = Gd, Tb) and 68 mol% LiF, respectively. Incongruent melting of the single crystals LiGdF4 and LiTbF4 is confirmed by differential scanning calorimetry. For the first time, the crystal structures of LiGdF4 and LiTbF4 are determined by Rietveld method. Also, rare‐earth lithium fluoride syntheses from lithium nitrate melts at 400 °С are performed for LiTbF4, LiGdF4, LiYF4, and LiDyF4 compounds. For terbium, the product is a mixture of LiTbF4 and TbF3; and for gadolinium, GdF3 is thus produced. With reference to the related literature, it is concluded that LiGdF4 and LiTbF4 are the thermodynamically stable phases in the ranges from 750 ± 5 to 425 ± 15 °С, and from 782 ± 5 to 400 ± 15 °С, respectively. The metastability of LiGdF4 and LiTbF4, however, does not prevent the use of their single crystals as photonic materials.

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Synthesis of Calcium Fluoride Nanoparticles in a Microreactor with Intensely Swirling Flows

Cited by 19 publications

References 45 publications

Micromixing and Co-Precipitation in Continuous Microreactors with Swirled Flows and Microreactors with Impinging Swirled Flows

Micromixing and Co-Precipitation in Continuous Microreactors with Swirled Flows and Microreactors with Impinging Swirled Flows

Synthesis of SrF₂:Yb:Er ceramic precursor powder by co-precipitation from aqueous solution with different fluorinating media: NaF, KF and NH₄F

Thermal Stability of LiRF₄ (R = Gd, Tb) Compounds

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Synthesis of Calcium Fluoride Nanoparticles in a Microreactor with Intensely Swirling Flows

Cited by 19 publications

References 45 publications

Micromixing and Co-Precipitation in Continuous Microreactors with Swirled Flows and Microreactors with Impinging Swirled Flows

Micromixing and Co-Precipitation in Continuous Microreactors with Swirled Flows and Microreactors with Impinging Swirled Flows

Synthesis of SrF2:Yb:Er ceramic precursor powder by co-precipitation from aqueous solution with different fluorinating media: NaF, KF and NH4F

Thermal Stability of LiRF4 (R = Gd, Tb) Compounds

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Synthesis of SrF₂:Yb:Er ceramic precursor powder by co-precipitation from aqueous solution with different fluorinating media: NaF, KF and NH₄F

Thermal Stability of LiRF₄ (R = Gd, Tb) Compounds