Isothermal crystallization kinetics of the Ni63Cr18Si13B6 alloy

Millán, M.; Conde, A.

doi:10.1007/bf00549179

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The largest dimension can reach ∼10 μm, and the thickness (measured by a Profilometer) is ∼2 μm. The crystal habits are shown schematically in Figure b where faces and crystallographic directions are labeled in accordance with the literature. ,, Between the crossed polars, the crystals show white or pale-yellow first-order polarization colors.…”

Section: Resultsmentioning

confidence: 86%

Mechanism of Calcium Oxalate Monohydrate Kidney Stones Formation: Layered Spherulitic Growth

Al-Atar¹,

Bokov²,

Marshall³

et al. 2010

Chem. Mater.

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The morphology of calcium oxalate monohydrate (COM) kidney stones is studied using polarized light microscopy and X-ray diffraction. We show that polycrystalline structure of COM stones exhibits spherulitic texture where the arrangement of crystallites indicates that their fast growth direction is perpendicular to the corresponding radius of spherulite, resulting in the layered morphology. This is in contrast to “normal” spherulites, where the crystal growth process leads to the formation of a radiating array of fiber crystallites. We demonstrate that COM stones consist of spherulitic domains. The domains have the shape of comparatively narrow randomly distorted cones in which the crystallites form strong texture, so that their crystallographic axes have almost the same directions and the [100] crystallographic planes are nearly perpendicular to the radial direction of the domain. However, the order among the domains does not exist. Deviations of their radial directions from the corresponding radial directions of the whole stone are not large as a rule, while the other crystallographic directions of the domains are randomly distributed. A model of layered spherulitic growth explaining the observed morphology is proposed. The model suggests that every domain is formed by means of a continuous crystallization process periodically inhibited by precipitation of organic material so that alternating organic and polycrystalline layers appear. Fine crystalline channels remaining in organic layers connect neighboring crystalline layers and maintain, thereby, the coherence of crystal structure all over the domain. Preformed COM microcrystals occasionally adsorbed from urine on the surface of the growing organic layer serve as seeds for new spherulitic domains. The results are important for understanding the general principles of biomineralization, and spherulitic crystallization and could lead to the development of new strategies for preventing kidney stone formation.

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Section: Resultsmentioning

confidence: 86%

Mechanism of Calcium Oxalate Monohydrate Kidney Stones Formation: Layered Spherulitic Growth

Al-Atar¹,

Bokov²,

Marshall³

et al. 2010

Chem. Mater.

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“…Finally, due to addition of the amino acid the size of COM crystals diminishes by more than twice in comparison with that of the crystals grown from the solutions without the L‐asp additive. Under these conditions the shape of the crystals is also changed …”

Section: Resultsmentioning

confidence: 99%

Effect of Charge State of L‐Aspartic and L‐Arginine Amino Acids on Morphology of Calcium Oxalate Monohydrate Crystals

Taranets

Притула

Bezkrovnaya

et al. 2018

Crystal Research and Technology

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The influence of amino acids of different nature (L-aspartic acid (L-asp) and L-arginine (L-arg)) on the morphology and size of calcium oxalate monohydrate crystals (COM), one of the main components of pathogenic organomineral aggregates in the human organism, is studied. Addition of L-asp and L-arg is found to inhibit the processes of COM crystal growth, thereby decreasing the crystal size by more than twice compared to pure COM crystals. The increase in the concentration of L-asp and L-arg amino acids in the reaction mixture to 4 × 10 −3 m and higher leads to the appearance of individual COM crystal. At 20 × 10 −3 m concentration of the amino acid, individual crystals of size between 3 to 5 µm are mainly formed. L-asp and L-arg amino acids can block the growth of the {121} face due to the formation of hydrogen bonds, and the growth of the {100} and {010} faces by electrostatic interaction.

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“…The (100) surface is represented in Figure 3a. It is the most stable surface of COM 25,42 and is also present in the presence of additives. 19 The surface terminates in a flat plane containing oxalate (OX1) and calcium ions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Chondroitin 4-Sulfate on the Growth and Morphology of Calcium Oxalate Monohydrate: A Molecular Dynamics Study

Ruiz‐Hernandez

Leeuw

2015

Crystal Growth & Design

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Classical Molecular Dynamics (MD) simulations were used to study the interaction of a dimer of chondroitin 4-sulfate (Ch4S) with the (100), (010), and (121) surfaces of the mineral calcium oxalate monohydrate (COM). The Ch4S glycosaminoglycan has been implicated in the modulation of the biomineralization process of kidney stones. MD simulations of the mineral surfaces and the disaccharide in the presence of solvent water allowed us to compute the adsorption energies of the saccharides on the COM surfaces. The calculations show that Ch4S interacts with COM principally through the sulfate, the carboxylate and the carbonyl of the acetyl amine functional groups. The mode and strength of the interaction depends on the orientation of the disaccharide with respect to the surface and the ability of the Ch4S to replace the interactions of the water molecules that compete with the saccharide for adsorption sites on the COM surface. Ch4S binds more strongly to the (010) than the (100) surface, leading to a more pronounced [001]/[010] aspect ratio in the calculated crystal morphology.

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Isothermal crystallization kinetics of the Ni63Cr18Si13B6 alloy

Cited by 4 publications

References 13 publications

Mechanism of Calcium Oxalate Monohydrate Kidney Stones Formation: Layered Spherulitic Growth

Mechanism of Calcium Oxalate Monohydrate Kidney Stones Formation: Layered Spherulitic Growth

Effect of Charge State of L‐Aspartic and L‐Arginine Amino Acids on Morphology of Calcium Oxalate Monohydrate Crystals

Effect of Chondroitin 4-Sulfate on the Growth and Morphology of Calcium Oxalate Monohydrate: A Molecular Dynamics Study

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