Crystallization Kinetics of Lead Halide Perovskite Film Monitored by In Situ Terahertz Spectroscopy

2017 ◽  
Vol 8 (2) ◽  
pp. 401-406 ◽  
Author(s):  
S. J. Park ◽  
A. R. Kim ◽  
J. T. Hong ◽  
J. Y. Park ◽  
S. Lee ◽  
...  
Keyword(s):  
Crystallization Kinetics ◽  
Terahertz Spectroscopy ◽  
Halide Perovskite ◽  
Kinetics Of ◽  
Lead Halide

Reordering and Crystallization of Silicon Carbide Amorphized by Neutron Irradiation

2000 ◽  
Vol 650 ◽  
Author(s):  
Lance L. Snead ◽  
Martin Balden
Keyword(s):  
Thin Film ◽  
Silicon Carbide ◽  
Crystallization Kinetics ◽  
Neutron Irradiation ◽  
Onset Temperature ◽  
Kinetics Of Crystallization ◽  
Crystallization Onset Temperature ◽  
Crystallization Onset ◽  
Kinetics Of

ABSTRACTDensification and crystallization kinetics of bulk SiC amorphized by neutron irradiation is studied. The temperature of crystallization onset of this highly pure, fully amorphous bulk SiC was found to be between 875-885°C and crystallization is nearly complete by 950°C. In-situ TEM imaging confirms the onset of crystallization, though thin-film effects apparently alter the kinetics of crystallization above this temperature. It requires >1125°C for complete crystallization of the TEM foil. Annealing at temperatures between the irradiation and crystallization onset temperature is seen to cause significant densification attributed to a relaxation, or reordering, of the as-amorphized structure.

scholarly journals Morphology and crystallization kinetics of Rubber-modified Nylon 6 Prepared by Anionic In-situ Polymerization

2020 ◽  
Vol 27 (1) ◽  
pp. 204-215
Author(s):  
Hongkai Zhao ◽  
Dengchao Zhang ◽  
Yingshuang Li
Keyword(s):  
Crystallization Kinetics ◽  
In Situ Polymerization ◽  
Good Description ◽  
Nylon 6 ◽  
Avrami Equation ◽  
Infrared Analysis ◽  
Chain Segment ◽  
The Impact ◽  
Kinetics Of

AbstractIn this work, we modified nylon 6 with liquid rubber by in-situ polymerization. The infrared analysis suggested that HDI urea diketone is successfully blocked by caprolactam after grafting on hydroxyl of HTPB, and the rubber-modified nylon copolymer is generated by the anionic polymerization. The impact section analysis indicated the rubber-modified nylon 6 resin exhibited an alpha crystal form.With an increase in the rubber content, nylon 6 was more likely to generate stable α crystal. Avrami equation was a good description of the non-isothermal crystallization kinetics of nylon-6 and rubber-modified nylon-6 resin. Moreover, it is found that the initial crystallization temperature of nylon-6 chain segment decreased due to the flexible rubber chain segment. n value of rubber-modified nylon-6 indicated that its growth was the coexistence of two-dimensional discoid and three-dimensional spherulite growth. Finally, the addition of the rubber accelerated the crystallization rate of nylon 6.

scholarly journals Nanoscale Size Effects on Crystallization Kinetics of Metallic Glass Nanorods by In Situ TEM

2016 ◽  
Vol 22 (S3) ◽  
pp. 768-769 ◽  
Author(s):  
S. W. Sohn ◽  
Y. Jung ◽  
Y. Xie ◽  
C. Osuji ◽  
J. Schroers ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Crystallization Kinetics ◽  
Size Effects ◽  
In Situ Tem ◽  
Kinetics Of

Characterization and Crystallization Kinetics of in situ Prepared Poly(propylene terephthalate)/SiO2 Nanocomposites

2009 ◽  
Vol 211 (1) ◽  
pp. 66-79 ◽  
Author(s):  
Dimitris S. Achilias ◽  
Dimitrios N. Bikiaris ◽  
Efthimios Papastergiadis ◽  
Dimitris Giliopoulos ◽  
George Z. Papageorgiou
Keyword(s):  
Crystallization Kinetics ◽  
Sio2 Nanocomposites ◽  
Poly Propylene ◽  
Kinetics Of

Combined in Situ Photoluminescence and X-ray Scattering Reveals Defect Formation in Lead-Halide Perovskite Films

2021 ◽  
pp. 10156-10162
Author(s):  
Nada Mrkyvkova ◽  
Vladimír Held ◽  
Peter Nádaždy ◽  
Riyas Subair ◽  
Eva Majkova ◽  
...  
Keyword(s):  
Defect Formation ◽  
X Ray ◽  
X Ray Scattering ◽  
Halide Perovskite ◽  
Lead Halide ◽  
Ray Scattering

scholarly journals Nanocrystals perovskites photocatalyzed singlet oxygen generation for light-driven organic reactions

2021 ◽  
Author(s):  
Marco Corti ◽  
Rossella Chiara ◽  
Lidia Romani ◽  
Barbara Mannucci ◽  
Lorenzo Malavasi ◽  
...  
Keyword(s):  
Diels Alder ◽  
Organic Reactions ◽  
Hydroxy Ketone ◽  
Oxidation Reactions ◽  
Perovskite Nanocrystals ◽  
Oxygen Generation ◽  
Unsaturated Ketones ◽  
Halide Perovskite ◽  
Lead Halide

AbstractLead halide perovskite nanocrystals were prepared and used as photocatalysts for the in situ 1O2 generation to perform hetero Diels–Alder, ene and oxidation reactions with suitable dienes and alkenes. The methodology has been reasonably standardized and made applicable to a variety of olefinic substrates. The scope of the method is finely illustrated by the results in all the tested reactions, which allowed to obtain desymmetrized hydroxy-ketone derivatives, unsaturated ketones and epoxides. Some limitations were also observed especially in the case of the alkene oxidations as well as poor chemoselectivity was somewhere observed. Graphic abstract 1O2 generated by lead halide perovskite nanocrystals as photocatalyst in organic reactions.

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