Industrial Crystallization

Kim, Kwang‐Joo

doi:10.1002/ceat.201690038

Cited by 6 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possible that the silicate phase was removed during the clean-up procedure of the samples after the 200 h treatment and before the further treatment up to 1000 h. The presence of silicate phases on the coating surface requires some explanation. Since silicates are quite soluble in molten carbonates, 18 liquid extraction of silicon from the steel matrix is possible, which could explain the presence of silicate phases on the coating surface. In this sense, the presence of silicates on the surface of molten carbonate conversion layers was already observed in our previous studies.…”

Section: Resultsmentioning

confidence: 99%

Composite Cu-LaFeO₃Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Frangini

Masi

Seta

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

In our previous study copper oxide additions were used to accelerate the formation of perovskite LaFeO 3 conversion coatings on stainless steels from molten carbonate baths. Incorporation of copper particles into the growing coating was an additional effect resulting in the formation of a composite Cu-LaFeO 3 structure. In continuation to our previous study, the aim of this work is to report the effect of copper additions on long-term stability and performance of perovskite conversion coatings under IT-SOFC interconnect conditions. To this end, a Cu-LaFeO 3 coated K41 18Cr ferritic stainless steel was examined in air at 700 • C up to 1000 h. In order to simulate properly the situation of a real IT-SOFC cell, Area Specific Resistance (ASR) and Cr-barrier properties of the coated steel were evaluated simultaneously with a special coating characterization setup. Studies were conducted by comparison with single-phase LaFeO 3 coatings obtained in a molten carbonate bath similar to that used for the formation of the composite Cu-LaFeO 3 coatings but without the addition of copper oxide. Copper addition did not change the general morphology of the perovskite coating, which remains a multi-layer coating, being composed of an outer LaFeO 3 crystalline layer, a middle Fe-rich oxide and two inner Fe-Cr rich oxide layers. However, copper was beneficial in promoting a thinner and more stable coating structure along with finer perovskite grain size. These structural improvements were further confirmed by the results obtained with electrical measurements that showed a better ASR behavior of the Cu-LaFeO 3 coatings. On the other hand, no relevant copper effects could be detected on the coating oxidation stability and on the Cr-barrier properties of the perovskite conversion coatings. Both LaFeO 3 and Cu-LaFeO 3 coatings showed similarly high coating stability and excellent Cr-barrier capability in experiments conducted at 700 • C up to 1000 h. In definitive, dual-phase Cu-LaFeO 3 seem more promising systems for IT-SOFC interconnects than single-phase LaFeO 3 conversion coatings, although further improvements in ASR electrical properties are needed. Conventional 18Cr ferritic stainless steels are promising candidates for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) interconnects as they provide an optimal combination of cost, structural and chemical composition properties.1-3 However, the use of 18Cr ferritic stainless steels is not without its cost. Issues are related to formation of insulating chromia layers with high tendency to evaporate during their exposure to the IT-SOFC operating conditions. Hence, coating with a ceramic layer made of electro-conductive and corrosion-resistant spinel 4 or perovskite 5 oxides is usually considered a necessary addition for ensuring a stable and low Area Specific Resistance (ASR), which is a common way to express interfacial ohmic resistance in electrochemical devices. In particular, (Co-Mn) or (CuMn)-based spinel oxides as well as (La-Cr), (La-Co) or (La-Mn) perovskite oxides h...

show abstract

Section: Resultsmentioning

confidence: 99%

Composite Cu-LaFeO₃Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Frangini

Masi

Seta

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Crystallization is an important process in the chemical and pharmaceutical industries . In solution crystallization, the compounds with low purity will be dissolved in the solution, and the difference in solubility allows the compounds with high purity to be crystallized. − Crystal shape and size are important characteristics affecting the physical and chemical properties of products, and they also play a decisive role in the final performance of the product, including flowability and dissolution rate . Crystal shape is related to the relative growth rate of each crystal face.…”

Section: Introductionmentioning

confidence: 99%

Effect of Additives on the Morphology of γ-Aminobutyric Acid Crystals

Pan,

Cao,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

The effect of surfactant, polymer, and tailor-made additives on the crystallization of γ-aminobutyric acid (GABA) was studied in this work. Cooling crystallization of GABA in water yielded plate-like crystals. In the presence of sodium stearate, polyhedral block-like crystals of GABA were obtained. Hydroxyethyl cellulose (HEC) led to rod-like crystals, in which the morphology was associated with additive concentrations. Six kinds of amino acids were used as tailor-made additives, and they exhibit different influences on crystal shape and size. The induction time of GABA was determined in the absence and presence of additives. The results showed that sodium stearate promoted nucleation, while HEC, L-Lysine, L-histidine, and L-tyrosine inhibited nucleation. Crystal face indexing, Hirshfeld surface analysis, and molecular dynamics (MD) simulation in aqueous solution−crystal systems were carried out to investigate the affecting factors of different crystal faces. The polymer additive was selected as an example during MD simulation to calculate intermolecular interactions between the crystal face and solvent or additive. The effect of the additive on the mobility of the solute in solution was also evaluated by mean-square displacement. The additive offers an effective approach for changing crystal morphology and particle size and adapting it to different production requirements.

show abstract

Experimental cocrystal screening and solution based scale-up cocrystallization methods

Malamatari

Ross

Douroumis

et al. 2017

Advanced Drug Delivery Reviews

105

View full text Add to dashboard Cite

Industrial Crystallization

Abstract: Binding at the interface: We tested the inhibitory activity of a set of peptide sequences derived from an α‐helix of the dimeric trypanothione reductase from Leishmania infantum. Replacement of a glutamic acid residue with a lysine promoted monomer dissociation and enzyme inhibition.

Cited by 6 publications

References 22 publications

Composite Cu-LaFeO₃Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Composite Cu-LaFeO₃Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Effect of Additives on the Morphology of γ-Aminobutyric Acid Crystals

Experimental cocrystal screening and solution based scale-up cocrystallization methods

Contact Info

Product

Resources

About

Industrial Crystallization

Abstract: Binding at the interface: We tested the inhibitory activity of a set of peptide sequences derived from an α‐helix of the dimeric trypanothione reductase from Leishmania infantum. Replacement of a glutamic acid residue with a lysine promoted monomer dissociation and enzyme inhibition.

Cited by 6 publications

References 22 publications

Composite Cu-LaFeO3Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Composite Cu-LaFeO3Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Effect of Additives on the Morphology of γ-Aminobutyric Acid Crystals

Experimental cocrystal screening and solution based scale-up cocrystallization methods

Contact Info

Product

Resources

About

Composite Cu-LaFeO₃Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties

Composite Cu-LaFeO₃Conversion Coatings on a 18Cr Ferritic Stainless Steel for IT-SOFC Interconnects: Effect of Long-Term Air Exposure at 700°C on Cr Diffusion Barrier and Electrical Properties