Preparation of high-temperature superconductors by controlled double-jet precipitation

Stávek, Jiřı́; Hanslík, T.; Zapletal, V.

doi:10.1016/0167-577x(90)90159-j

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…This is in accordance with the estimation of supersaturation levels presented in Section . As already mentioned in Section , the double-feed configuration can be of considerable interest for the controlled precipitation process of sparingly soluble compounds, such as halides, oxalates, and sulfates. ,, …”

Section: Results and Discussionmentioning

confidence: 99%

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The Role of Operating Conditions in the Precipitation of Magnesium Hydroxide Hexagonal Platelets Using NaOH Solutions

Romano,

Trespi,

Achermann

et al. 2023

Crystal Growth & Design

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Magnesium hydroxide, Mg(OH)2, is an inorganic compound extensively employed in several industrial sectors. Nowadays, it is mostly produced from magnesium-rich minerals. Nevertheless, magnesium-rich solutions, such as natural and industrial brines, could prove to be a great treasure. In this work, synthetic magnesium chloride and sodium hydroxide (NaOH) solutions were used to recover Mg(OH)2 by reactive crystallization. A detailed experimental campaign was conducted aiming at producing grown Mg(OH)2 hexagonal platelets. Experiments were carried out in a stirred tank crystallizer operated in single- and double-feed configurations. In the single-feed configuration, globular and nanoflakes primary particles were obtained, as always reported in the literature when NaOH is used as a precipitant. However, these products are not complying with flame-retardant applications that require large hexagonal Mg(OH)2 platelets. This work suggests an effective precipitation strategy to favor crystal growth while, at the same time, limiting the nucleation mechanism. The double-feed configuration allowed the synthesis of grown Mg(OH)2 hexagonal platelets. The influence of reactant flow rates, reactant concentrations, and reaction temperature was analyzed. Scanning electron microscopy (SEM) pictures were also taken to investigate the morphology of Mg(OH)2 crystals. The proposed precipitation strategy paves the road to satisfy flame-retardant market requirements.

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Section: Results and Discussionmentioning

confidence: 99%

“…As already mentioned in Section 1, the double-feed configuration can be of considerable interest for the controlled precipitation process of sparingly soluble compounds, such as halides, oxalates, and sulfates. 26,37,38 3.2.2.2. Influence of Reactant Concentrations in Double-Feed Configuration.…”

Section: Influence Of Reactant Flowmentioning

confidence: 99%

The Role of Operating Conditions in the Precipitation of Magnesium Hydroxide Hexagonal Platelets Using NaOH Solutions

Romano,

Trespi,

Achermann

et al. 2023

Crystal Growth & Design

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“…The conventional approach for the industrial production of CaCO 3 is precipitation by carbon dioxide bubbling through a calcium containing solution (gas diffusion method) [104,105]. Moreover, chemical methods include the controlled double-jet precipitation technique [106,107,108] and solvothermal growth [109].…”

Section: Calcium Carbonate Drug Carriersmentioning

confidence: 99%

Porous Inorganic Carriers Based on Silica, Calcium Carbonate and Calcium Phosphate for Controlled/Modulated Drug Delivery: Fresh Outlook and Future Perspectives

et al. 2018

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Porous inorganic nanostructured materials are widely used nowadays as drug delivery carriers due to their adventurous features: suitable architecture, large surface area and stability in the biological fluids. Among the different types of inorganic porous materials, silica, calcium carbonate, and calcium phosphate have received significant attention in the last decade. The use of porous inorganic materials as drug carriers for cancer therapy, gene delivery etc. has the potential to improve the life expectancy of the patients affected by the disease. The main goal of this review is to provide general information on the current state of the art of synthesis of the inorganic porous particles based on silica, calcium carbonate and calcium phosphate. Special focus is dedicated to the loading capacity, controllable release of drugs under internal biological stimuli (e.g., pH, redox, enzymes) and external noninvasive stimuli (e.g., light, magnetic field, and ultrasound). Moreover, the diverse compounds to deliver with silica, calcium carbonate and calcium phosphate particles, ranging from the commercial drugs to genetic materials are also discussed.

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“…24 In the double-jet method or CDJP (controlled double-jet precipitation) the cation and anion solutions are added simultaneously through separate lines to a stirred solution of a lyophilic polymer. 33 This method was used by Jiang et al 34 in the first time for polymorphism study of CaCO 3 in aqueous solution under mild conditions, without any organic additives. They showed that increasing temperature, there were different polymorphs for CaCO 3 as can be seen in Figure 2.…”

Section: Methods For Caco 3 Particles' Synthesismentioning

confidence: 99%

Precipitated Calcium Carbonate Nano-Microparticles: Applications in Drug Delivery

Costa¹,

Olyveira²,

Salomão³

2017

ATROA

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Calcium carbonate (CaCO3) precipitated particles present huge applications in drug delivery systems because their characteristics (such as size distribution, crystalline phase and specific surface area) can be precisely tailored during the synthesis. Besides this, most of the processing methods present competitive costs and produce highly biocompatible materials. This work reviewed briefly some of the many chemical and biological synthesis methods for CaCO3 nano-microparticles as well as their combination with different macromolecules (active principles, polyelectrolytes and DNA)..

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Preparation of high-temperature superconductors by controlled double-jet precipitation

Cited by 5 publications

References 7 publications

The Role of Operating Conditions in the Precipitation of Magnesium Hydroxide Hexagonal Platelets Using NaOH Solutions

The Role of Operating Conditions in the Precipitation of Magnesium Hydroxide Hexagonal Platelets Using NaOH Solutions

Porous Inorganic Carriers Based on Silica, Calcium Carbonate and Calcium Phosphate for Controlled/Modulated Drug Delivery: Fresh Outlook and Future Perspectives

Precipitated Calcium Carbonate Nano-Microparticles: Applications in Drug Delivery

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