scholarly journals Impact of synthesis conditions on the morphology and crystal structure of tungsten nitride nanomaterials

RSC Advances ◽  
2021 ◽  
Vol 11 (45) ◽  
pp. 28198-28210
Author(s):  
Olivia Wenzel ◽  
Viktor Rein ◽  
Milena Hugenschmidt ◽  
Frank Schilling ◽  
Claus Feldmann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Tungsten Nitride ◽  
Synthesis Conditions ◽  
Synthesis Strategy ◽  
Potential Applications

Nanocrystalline tungsten nitride (WNx) aggregates and nanosheets are synthesized with a new alkylamine-based synthesis strategy for potential applications in nanoelectronics and catalysis.

Preparation, Performances and Reaction Process of NiZrNb2O8 Microwave Dielectric Ceramics

2018 ◽  
Vol 281 ◽  
pp. 591-597
Author(s):  
Meng Juan Wu ◽  
Ying Chun Zhang ◽  
Jun Dan Chen ◽  
Yun Zhang
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Raw Materials ◽  
Sem Analysis ◽  
Reaction Process ◽  
Microwave Dielectric Ceramics ◽  
Microwave Dielectric ◽  
Potential Applications ◽  
Dielectric Ceramics

Microwave dielectric ceramics have great potential applications in the fields of modern communication technology. However, the effects of processing of solid reaction on the crystal structure and properties of NiZrNb2O8 has not been reported. In this paper, the NiZrNb2O8 ceramic was prepared using different raw materials. The solid state reaction process, crystal structure, and dielectric properties of the NiZrNb2O8 ceramics were investigated. The X-ray diffractometer (XRD) results showed that the solid state reaction of NiZrNb2O8 could be divided into two steps using NiO, ZrO2 and Nb2O6 as raw materials. Scanning electron microscope (SEM) analysis results showed that the surface of NiZrNb2O8 prepared from NiNb2O6 and ZrO2 was more compact. The optimal density of the samples reached 99.28% of the theoretical value. And the dielectric constant (εr), quality factor (Q×f), temperature coefficient of resonant (τf) reached 23.6, 37237 GHz, -7.796 ppm/°C, respectively.

scholarly journals Crystal Structure of the Human Astrovirus Capsid Protein

2016 ◽  
Vol 90 (20) ◽  
pp. 9008-9017 ◽  
Author(s):  
Yukimatsu Toh ◽  
Justin Harper ◽  
Kelly A. Dryden ◽  
Mark Yeager ◽  
Carlos F. Arias ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Capsid Protein ◽  
Proteolytic Processing ◽  
Terminal Domain ◽  
Capsid Shell ◽  
Potential Applications ◽  
Nonenveloped Virus ◽  
Human Astrovirus ◽  
Icosahedral Capsid ◽  
Infants And Young Children

ABSTRACTHuman astrovirus (HAstV) is a leading cause of viral diarrhea in infants and young children worldwide. HAstV is a nonenveloped virus with a T=3 capsid and a positive-sense RNA genome. The capsid protein (CP) of HAstV is synthesized as a 90-kDa precursor (VP90) that can be divided into three linear domains: a conserved N-terminal domain, a hypervariable domain, and an acidic C-terminal domain. Maturation of HAstV requires proteolytic processing of the astrovirus CP both inside and outside the host cell, resulting in the removal of the C-terminal domain and the breakdown of the rest of the CP into three predominant protein species with molecular masses of ∼34, 27/29, and 25/26 kDa, respectively. We have now solved the crystal structure of VP9071–415(amino acids [aa] 71 to 415 of VP90) of human astrovirus serotype 8 at a 2.15-Å resolution. VP9071–415encompasses the conserved N-terminal domain of VP90 but lacks the hypervariable domain, which forms the capsid surface spikes. The structure of VP9071–415is comprised of two domains: an S domain, which adopts the typical jelly-roll β-barrel fold, and a P1 domain, which forms a squashed β-barrel consisting of six antiparallel β-strands similar to what was observed in the hepatitis E virus (HEV) capsid structure. Fitting of the VP9071–415structure into the cryo-electron microscopy (EM) maps of HAstV produced an atomic model for a continuous, T=3 icosahedral capsid shell. Our pseudoatomic model of the human HAstV capsid shell provides valuable insights into intermolecular interactions required for capsid assembly and trypsin-mediated proteolytic maturation needed for virus infectivity. Such information has potential applications in the development of a virus-like particle (VLP) vaccine as well as small-molecule drugs targeting astrovirus assembly/maturation.IMPORTANCEHuman astrovirus (HAstV) is a leading cause of viral diarrhea in infants and young children worldwide. As a nonenveloped virus, HAstV exhibits an intriguing feature in that its maturation requires extensive proteolytic processing of the astrovirus capsid protein (CP) both inside and outside the host cell. Mature HAstV contains three predominant protein species, but the mechanism for acquired infectivity upon maturation is unclear. We have solved the crystal structure of VP9071–415of human astrovirus serotype 8. VP9071–415encompasses the conserved N-terminal domain of the viral CP. Fitting of the VP9071–415structure into the cryo-EM maps of HAstV produced an atomic model for the T=3 icosahedral capsid. Our model of the HAstV capsid provides valuable insights into intermolecular interactions required for capsid assembly and trypsin-mediated proteolytic maturation. Such information has potential applications in the development of a VLP vaccine as well as small-molecule drugs targeting astrovirus assembly/maturation.

Synthesis and characterization of the lead borate Pb6B12O21(OH)6

2016 ◽  
Vol 71 (8) ◽  
pp. 925-933 ◽  
Author(s):  
Sandra Schönegger ◽  
Teresa S. Ortner ◽  
Klaus Wurst ◽  
Gunter Heymann ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Potassium Nitrate ◽  
Lattice Parameters ◽  
Synthesis And Characterization ◽  
Lead Borate ◽  
Hydrothermal Conditions ◽  
Organic Reagents ◽  
Synthesis Conditions

AbstractA lead borate with the composition Pb6B12O21(OH)6 was synthesized through a hydrothermal synthesis, using lead metaborate in combination with sodium nitrate and potassium nitrate. The compound crystallizes in the trigonal, non-centrosymmetric space group P32 (no. 145) with the lattice parameters a = 1176.0(4), c = 1333.0(4) pm, and V = 0.1596(2) nm3. Interestingly, the data of Pb6B12O21(OH)6 correct the structure of a literature known lead borate with the composition “Pb6B11O18(OH)9”. For the latter compound, nearly identical lattice parameters of a = 1176.91(7) and c = 1333.62(12) pm were reported, possessing a crystal structure, in which the localization and refinement of one boron atom was obviously overlooked. The structure of Pb6B12O21(OH)6 is built up from trigonal planar BO3 and tetrahedral BO4 groups forming complex chains. The Pb2+ cations are located between neighboring polyborate chains. The here reported compound Pb6B12O21(OH)6 and “Pb6B11O18(OH)9” were, however, produced under different synthesis conditions. While “Pb6B11O18(OH)9” was synthesized via a hydrothermal synthesis including ethylenediamine and acetic acid, the here reported lead borate Pb6B12O21(OH)6 could be obtained under moderate hydrothermal conditions (240°C) without the addition of organic reagents.

Effect of synthesis conditions on the morphology and crystal structure of biferroic Bi5Ti3FeO15

2014 ◽  
Vol 40 (5) ◽  
pp. 7459-7465 ◽  
Author(s):  
M. García-Guaderrama ◽  
Gregorio Guadalupe Carbajal Arizaga ◽  
A. Durán
Keyword(s):  
Crystal Structure ◽  
Synthesis Conditions

Study on Synthesis and Properties of the Hafnium Tungstate by CO2 Laser

2010 ◽  
Vol 154-155 ◽  
pp. 467-470
Author(s):  
Jun Ping Wang ◽  
Qing Dong Chen ◽  
Er Jun Liang
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Raman Spectra ◽  
Co2 Laser ◽  
Wide Temperature Range ◽  
Negative Thermal Expansion ◽  
Cubic Phase ◽  
Unusual Property ◽  
Potential Applications ◽  
Nano Rods

The crystal structure of hafnium tungstate displays unusual property of isotropic negative thermal expansion in a wide temperature range which brings about a number of important potential applications. In this work, densely packed hafnium tungstate blocks are rapid synthesized by CO2 laser. The result of XRD and Raman spectra show that the samples contain single cubic phase of α-HfW2O8 with space group P213. The SEM observations show that the sample is composed of nano-rods which grow horizontally on the surface and in the interior. The nano-threads in the interior are composed of densely packed nano-crystallites.

NH3-assisted synthesis of microporous silicon oxycarbonitride ceramics from preceramic polymers: a combined N2 and CO2 adsorption and small angle X-ray scattering study

2015 ◽  
Vol 3 (2) ◽  
pp. 805-818 ◽  
Author(s):  
Cristina Schitco ◽  
Mahdi Seifollahi Bazarjani ◽  
Ralf Riedel ◽  
Aleksander Gurlo
Keyword(s):  
Small Angle ◽  
Gas Adsorption ◽  
Co2 Adsorption ◽  
X Ray ◽  
Preceramic Polymers ◽  
X Ray Scattering ◽  
Synthesis Strategy ◽  
Potential Applications ◽  
Scattering Study ◽  
Silicon Oxycarbonitride

The NH3-assisted synthesis strategy from preceramic polymers provides tools to engineer the porosity of microporous SiCNO ceramics for potential applications in the fields of catalysis, gas adsorption and gas separation.

scholarly journals SYNTHESIS OF ZINC SULFIDE RADIOLUMINESCENT PHOSPHORS WITH USE OF ELECTRONIC BEAM MODIFICATION AND INVESTIGATION OF THEIR PROPERTIES

2021 ◽  
Vol 58 ◽  
pp. 46-50
Author(s):  
Mikhail A. Shvindin ◽  
◽  
Vadim V. Bakhmetyev ◽  
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Electron Beam ◽  
Solid State ◽  
Zinc Sulfide ◽  
Spectral Characteristics ◽  
Light Sources ◽  
Synthesis Conditions ◽  
Radioluminescent Light Sources ◽  
First Time

Synthesized recombination-type zinc sulfide phosphors used in solid-state radioluminescent light sources (SSRLS) are the object of the research. In the course of the study, experimental data were obtained for the first time on the effect of the amount of the incorporated activator on the brightness-spectral characteristics of radioluminescence upon excitation by β-radiation of tritium. Data were obtained on the changes in the radioluminescence parameters under various synthesis conditions, phase composition and electron-beam modification of the crystal structure of the initial phosphors. The results of the work make it possible to find the best light compositions for the use in solid-state radioluminescent light sources

scholarly journals Interplay Between Synthesis Conditions, Crystal Structure, Morphology and OER Activity of AgFeO2 Delafossite Materials

2021 ◽  
Author(s):  
Doğan ÇİRMİ ◽  
Özkan GÖRMEZ ◽  
Barış SAÇLI ◽  
Uğur ÇAĞLAYAN ◽  
Muharrem KUNDURACI
Keyword(s):  
Crystal Structure ◽  
Synthesis Conditions ◽  
Structure Morphology

scholarly journals Photochromism in Anils - A Review

2015 ◽  
Vol 2 (1) ◽  
pp. 7-19 ◽  
Author(s):  
M.S.M. Rawat ◽  
Sudagar Mal ◽  
Pramod Singh
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Historical Perspective ◽  
Hydrogen Transfer ◽  
Photochromic Property ◽  
Keto Form ◽  
Imine Nitrogen ◽  
Phenolic Oxygen ◽  
Potential Applications

This review describes in brief the historical perspective of photochromism and photochromic behaviour of ‘Anils’. This phenomenon among ‘Anils’ is exhibited due to the tautomerism between enol and keto form via six membered hydrogen transfer between the phenolic hydrogen and imine nitrogen and show the phenomenon of solid-state photochromism and thermochromism and photochromism in rigid glassy solutions as well. Photochromic property in ‘Anils’ is a characteristic of the molecule, but their chromo behaviour is not only influenced by the crystal structure of anils but also by the substituents in the salicylidene-aniline molecules by affecting the acidity of phenolic oxygen as well as the basicity of imine nitrogen that affects the enolic-character of anils. The growing interest in photochromic anils is due to the potential applications, more specifically due to the existence of anils in enolic- and keto- forms.

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