scholarly journals Evaluation of commercial Pb-sources for the A-site cation in the production of lead-based perovskite materials.

2020 ◽  
Author(s):  
Anna Duke ◽  
Marissa Ringgold ◽  
Timothy Boyle ◽  
Douglas Read
Keyword(s):  
Perovskite Materials ◽  
A Site

scholarly journals Tuning octahedral tilts and the polar nature of A-site deficient perovskites

2019 ◽  
Vol 55 (18) ◽  
pp. 2609-2612 ◽  
Author(s):  
Dashnor Beqiri ◽  
Vanessa Cascos ◽  
Jennie Roberts-Watts ◽  
Ewan R. Clark ◽  
Eric Bousquet ◽  
...  
Keyword(s):  
Structural Chemistry ◽  
Perovskite Materials ◽  
A Site

This work explores the possibility of tuning the structural chemistry of A-site deficient perovskite materials Ln1/3NbO3, and the balance between proper and hybrid-improper mechanisms for polar behaviour in these systems.

Arranging strategies for A-site cations: impact on the stability and carrier migration of hybrid perovskite materials

2020 ◽  
Vol 7 (8) ◽  
pp. 1741-1749 ◽  
Author(s):  
Wei Jian ◽  
Ran Jia ◽  
Hong-Xing Zhang ◽  
Fu-Quan Bai
Keyword(s):  
Excited State ◽  
Engineering Process ◽  
Perovskite Materials ◽  
Hybrid Perovskite ◽  
The Stability ◽  
A Site

An essential understanding is obtained from the cation engineering process into the expected excited-state properties of hybrid perovskite materials.

Photoluminescence spectral broadening, chirality transfer and amplification of chiral perovskite materials (R-X-p-mBZA)2PbBr4 (X = H, F, Cl, Br) regulated by van der Waals and halogen atoms interactions

2020 ◽  
Vol 22 (30) ◽  
pp. 17299-17305
Author(s):  
Chenyang Zhou ◽  
Ya Chu ◽  
Linlin Ma ◽  
Yingqian Zhong ◽  
Chao Wang ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Chiral Molecules ◽  
Spectral Broadening ◽  
Chirality Transfer ◽  
Inorganic Hybrid ◽  
Halogen Atoms ◽  
Perovskite Materials ◽  
A Site

We introduced halogen-substituted chiral molecules as A-site cations to synthesize a series of novel organic–inorganic hybrid 2D chiral perovskite materials (R-X-p-mBZA)2PbBr4 (X = H, F, Cl, Br; p: para-position; mBZA = α-methylbenzylamine).

scholarly journals Surfactant-Free Synthesis of Three-Dimensional Perovskite Titania-Based Micron-Scale Motifs Used as Catalytic Supports for the Methanol Oxidation Reaction

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 909
Author(s):  
Nathaniel Hurley ◽  
Luyao Li ◽  
Christopher Koenigsmann ◽  
Stanislaus S. Wong
Keyword(s):  
Chemical Composition ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Specific Activity ◽  
Three Dimensional ◽  
Methanol Oxidation Reaction ◽  
Perovskite Materials ◽  
Synthesis Procedure ◽  
Catalytic Supports ◽  
A Site

We synthesized and subsequently rationalized the formation of a series of 3D hierarchical metal oxide spherical motifs. Specifically, we varied the chemical composition within a family of ATiO3 (wherein “A” = Ca, Sr, and Ba) perovskites, using a two-step, surfactant-free synthesis procedure to generate structures with average diameters of ~3 microns. In terms of demonstrating the practicality of these perovskite materials, we have explored their use as supports for the methanol oxidation reaction (MOR) as a function of their size, morphology, and chemical composition. The MOR activity of our target systems was found to increase with decreasing ionic radius of the “A” site cation, in order of Pt/CaTiO3 (CTO) > Pt/SrTiO3 (STO) > Pt/BaTiO3 (BTO). With respect to morphology, we observed an MOR enhancement of our 3D spherical motifs, as compared with either ultra-small or cubic control samples. Moreover, the Pt/CTO sample yielded not only improved mass and specific activity values but also a greater stability and durability, as compared with both commercial TiO2 nanoparticle standards and precursor TiO2 templates.

Eels Under Standing Wave Conditions

1982 ◽  
Vol 40 ◽  
pp. 492-495
Author(s):  
O.L. Krivanek ◽  
J. TaftØ
Keyword(s):  
Standing Wave ◽  
Wave Conditions ◽  
Set Up ◽  
A Site ◽  
Complex Crystal

It is well known that a standing electron wavefield can be set up in a crystal such that its intensity peaks at the atomic sites or between the sites or in the case of more complex crystal, at one or another type of a site. The effect is usually referred to as channelling but this term is not entirely appropriate; by analogy with the more established particle channelling, electrons would have to be described as channelling either through the channels or through the channel walls, depending on the diffraction conditions.

Head Size and DNA Content in Bacteriophage T4

1972 ◽  
Vol 30 ◽  
pp. 200-201
Author(s):  
Fred Eiserling ◽  
A. H. Doermann ◽  
Linde Boehner
Keyword(s):  
Electron Microscopy ◽  
Dna Content ◽  
Bacteriophage T4 ◽  
Head Size ◽  
Virus Particles ◽  
Altered Protein ◽  
A Cell ◽  
Bacterial Viruses ◽  
A Site ◽  
Protein Shell

The control of form or shape inheritance can be approached by studying the morphogenesis of bacterial viruses. Shape variants of bacteriophage T4 with altered protein shell (capsid) size and nucleic acid (DNA) content have been found by electron microscopy, and a mutant (E920g in gene 66) controlling head size has been described. This mutant produces short-headed particles which contain 2/3 the normal DNA content and which are non-viable when only one particle infects a cell (Fig. 1).We report here the isolation of a new mutant (191c) which also appears to be in gene 66 but at a site distinct from E920g. The most striking phenotype of the mutant is the production of about 10% of the phage yield as “giant” virus particles, from 3 to 8 times longer than normal phage (Fig. 2).

Exploration-Stage Implementation Variation

2014 ◽  
Vol 222 (1) ◽  
pp. 37-48 ◽  
Author(s):  
Stephanie Romney ◽  
Nathaniel Israel ◽  
Danijela Zlatevski
Keyword(s):  
Parent Training ◽  
Average Cost ◽  
Cost Savings ◽  
Training Group ◽  
Group Differences ◽  
Triple P ◽  
Community Based ◽  
Parent Training Program ◽  
A Site ◽  
The Cost

The present study examines the effect of agency-level implementation variation on the cost-effectiveness of an evidence-based parent training program (Positive Parenting Program: “Triple P”). Staff from six community-based agencies participated in a five-day training to prepare them to deliver a 12-week Triple P parent training group to caregivers. Prior to the training, administrators and staff from four of the agencies completed a site readiness process intended to prepare them for the implementation demands of successfully delivering the group, while the other two agencies did not complete the process. Following the delivery of each agency’s first Triple P group, the graduation rate and average cost per class graduate were calculated. The average cost-per-graduate was over seven times higher for the two agencies that had not completed the readiness process than for the four completing agencies ($7,811 vs. $1,052). The contrast in costs was due to high participant attrition in the Triple P groups delivered by the two agencies that did not complete the readiness process. The odds of Triple P participants graduating were 12.2 times greater for those in groups run by sites that had completed the readiness process. This differential attrition was not accounted for by between-group differences in participant characteristics at pretest. While the natural design of this study limits the ability to empirically test all alternative explanations, these findings indicate a striking cost savings for sites completing the readiness process and support the thoughtful application of readiness procedures in the early stages of an implementation initiative.

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