Sequential Cation Exchange in Nanocrystals: Preservation of Crystal Phase and Formation of Metastable Phases

Nano Letters ◽  
2011 ◽  
Vol 11 (11) ◽  
pp. 4964-4970 ◽  
Author(s):  
Hongbo Li ◽  
Marco Zanella ◽  
Alessandro Genovese ◽  
Mauro Povia ◽  
Andrea Falqui ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Metastable Phases ◽  
Crystal Phase

scholarly journals Direct synthesis of metastable phases of 2D transition metal dichalcogenides

2020 ◽  
Vol 49 (12) ◽  
pp. 3952-3980 ◽  
Author(s):  
Maria S. Sokolikova ◽  
Cecilia Mattevi
Keyword(s):  
Transition Metal ◽  
Critical Review ◽  
Direct Synthesis ◽  
Transition Metal Dichalcogenides ◽  
Phase Control ◽  
Metastable Phases ◽  
Crystal Phase ◽  
Chemical Mechanisms ◽  
Metal Dichalcogenides

This critical review investigates the synthesis strategies designed to achieve the crystal phase control in TMDs and discusses the chemical mechanisms that can drive the synthesis of metastable phases.

AEM analysis of solidification catalysts in atomized Fe-Ni

1986 ◽  
Vol 44 ◽  
pp. 584-585
Author(s):  
Matthew R. Libera
Keyword(s):  
Powder Particle ◽  
Alloy Composition ◽  
Particle Diameter ◽  
Metastable Phases ◽  
Liquid Droplets ◽  
Nucleation Kinetics ◽  
Ni Alloys ◽  
Nonequilibrium Solidification

The liquid droplets produced by atomization processes are believed to undergo substantial supercooling during solidification, because the catalytic heterogeneities, for statistical reasons, tend to be isolated in the larger droplets. This supercooling can lead to the nucleation of metastable phases. As part of a study on the effect of liquid supercooling on nonequilibrium solidification, three binary Fe-Ni alloys have been produced by conventional argon atomization (Fe-20Ni, Fe-30Ni, and Fe-40Ni). The primary variables in these experiments are: i) the alloy composition; and ii) the powder particle diameter (inversely proportional to supercooling). Of particular interest in this system is the competitive nucleation kinetics between the stable fee and metastable bec phases. Bcc is expected to nucleate preferentially with decreasing %Ni and decreasing particle diameter.

MÖSSBAUER STUDY OF METASTABLE PHASES IN Ti-3at% Mo ALLOY

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-604-C2-607 ◽  
Author(s):  
Ch. Leibovitch ◽  
A. Rabinkin ◽  
M. Ron ◽  
E. Gartstein
Keyword(s):  
Metastable Phases ◽  
Mössbauer Study

The Effect of Calcium and Magnesium on Rabbit Blood Platelet Aggregation in Vitro

1964 ◽  
Vol 12 (01) ◽  
pp. 179-200 ◽  
Author(s):  
Torstein Hovig
Keyword(s):  
Platelet Aggregation ◽  
Cation Exchange ◽  
Calcium Concentration ◽  
Blood Platelets ◽  
Blood Platelet ◽  
Rabbit Blood ◽  
Calcium And Magnesium ◽  
Induced Aggregation ◽  
Blood Platelet Aggregation

SummaryThe effect of calcium and magnesium on the aggregation of rabbit blood platelets in vitro was studied, with the following results:1. Platelet aggregation induced by ADP or collagen could be prevented by EGTA or EDTA. The aggregating effect was restored by recalcification. The effect was also restored by addition of magnesium in EDTA-PRP, but not in EGTA-PRP unless a surplus of calcium was present.2. Calcium remained in concentrations of the order of 0.15–0.25 mM after dialysis or cation exchange of plasma. Aggregation of washed platelets resuspended in such plasma could not be produced with ADP or collagen, unless the calcium concentration was increased or that magnesium was added.3. The adhesiveness of blood platelets to collagen was reduced in EGTA-PRP and EDTA-PRP. Release of ADP from platelets influenced by collagen could not be demonstrated either in EGTA-PRP (presence of magnesium) or in EDTA-PRP.4. It is concluded that calcium is a necessary factor both for the reaction leading to release of ADP and for the the aggregation produced by ADP.5. Thrombin induced aggregation of washed platelets suspended in tris-buffered saline in the presence of calcium. No effect of magnesium could be observed unless small quantities of calcium were present.

Hydrous oxides and their cation-exchange properties

1965 ◽  
Vol 15 (10) ◽  
pp. 445-448 ◽  
Author(s):  
C. Heitner-Wirguin ◽  
A. Albu-Yaron
Keyword(s):  
Cation Exchange ◽  
Hydrous Oxides ◽  
Exchange Properties

The Temperature and Counter-ion Dependency of Cation Exchange Equilibria

1960 ◽  
Vol 25 (1_2) ◽  
pp. 81-89 ◽  
Author(s):  
O. D. Bonner ◽  
G. Dickel ◽  
H. Brümmer
Keyword(s):  
Cation Exchange ◽  
Counter Ion
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