Electrospinning of Single-Crystal Vanadium Oxide Nanorods

2006 ◽  
Vol 988 ◽  
Author(s):  
Chunmei Ban ◽  
M. Stanley Whittingham
Keyword(s):  
Vanadium Oxide ◽  
Single Crystal ◽  
Hydrothermal Treatment ◽  
Synthesis Method ◽  
Electrospinning Process ◽  
Organic Polymer ◽  
X Ray Diffraction ◽  
Layer Spacing ◽  
Oxide Nanorods ◽  
Variable Chemical

AbstractVanadium oxide nanorods intercalated with lithium cations have been successfully formed by the hydrothermal treatment of electrospun precursors. The novelty of this synthesis method is the control of the morphology of the vanadium nanorod precursor by the electrospinning process, and then to convert to the desired compound with loss of the organic polymer while maintaining the morphology through a hydrothermal treatment. Transmission llectron microcopy shows that the single nanorods formed have a square shape cross-section with a width of less than 100nm. Electron diffraction shows that each nanorod is a single crystal, and X-ray diffraction shows that the nanorods have a layered structure with a 10.5 Å layer spacing. Their characterization, magnetic and electrochemical behavior and variable chemical composition are described together with the opportunities electrospinning presents for forming novel materials.

Synthesis and Properties of Poly(Vinyl Alcohol)/Calcium Aluminate Nanocomposites

1991 ◽  
Vol 245 ◽  
Author(s):  
Phillip B. Messersmith ◽  
Samuel I. Stupp
Keyword(s):  
Calcium Aluminate ◽  
Vinyl Alcohol ◽  
Organic Polymer ◽  
Poly Vinyl Alcohol ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Layer Spacing ◽  
X Ray ◽  
New Class ◽  
Cementitious Systems

ABSTRACTThis paper describes the synthesis, structure and properties of a new layered nanocomposite which may have applications in cementitious systems. This material is one example of a new class of materials which consist of inorganic crystals containing intercalated organic polymer. The nanocomposite is synthesized by precipitating Ca2Al(OH)6[X]·nH2O (X=OH−, CO3−2) in the presence of poly(vinyl alcohol) (PVA). X-ray diffraction analysis indicates that the nanocomposite consists of calcium aluminate layers separated by interlayers containing anions, water and PVA. The intercalation of PVA can only be accomplished during crystal growth and is accompanied by an expansion in layer spacing from ˜8 Å to ˜18 Å. The nanocomposite exhibited enhanced thermal stability and when compacted into a cylinder was found to have more than twice the compressive strength than the pure calcium aluminate.

Single crystal X-ray structure determination and temperature-dependent structural studies of the smectogenic compound 7OS5

2020 ◽  
Vol 76 (6) ◽  
pp. 1128-1135
Author(s):  
Aleksandra Deptuch ◽  
Teresa Jaworska-Gołąb ◽  
Joachim Kusz ◽  
Maria Książek ◽  
Keigo Nagao ◽  
...  
Keyword(s):  
Single Crystal ◽  
Homologous Series ◽  
Liquid Crystalline ◽  
Temperature Phase ◽  
Smectic Layer ◽  
X Ray Diffraction ◽  
Crystalline Phases ◽  
Layer Spacing ◽  
X Ray ◽  
Liquid Crystalline Phases

Structural characteristics of solid and liquid crystalline phases of 7OS5 (4-n-pentylphenyl-4′-n-heptyloxythiobenzoate), the achiral smectogenic mesogen with the shortest terminal carbon chain in the nOS5 homologous series, are studied by complementary methods. Simultaneously perfomed X-ray diffraction and differential scanning calorimetry occur to be a powerful tool to study metastable phases. The single crystal structure of a high-temperature phase, supercooled from the room temperature down to −183°C [orthorhombic crystal system; space group Pca21; a = 54.285 (5) Å, b = 5.5843 (3) Å, c = 14.841 (1) Å, Z = 8] is determined. Lamellar ordering of elongated molecules is stabilized by hydrogen bonds . Temperature dependence of unit-cell parameters in two crystal phases as well as structural parameters of liquid crystalline phases (smectic layer spacing, tilt angle, average distance between the long axes of molecules and correlation lengths) are determined by X-ray diffraction. The obtained results are compared with the data available for other compounds in the nOS5 homologous series.

Hydrothermal Syntheses and Crystal Structures of Two New Mixed-valence Vanadium Oxides [Ni(en)2(H2O)2][Ni(en)3]2[V16O38Cl] · 3(H2O) and (H3O)2V3O8

2010 ◽  
Vol 65 (12) ◽  
pp. 1451-1456 ◽  
Author(s):  
Xing Liu ◽  
Xian-Hong Yin ◽  
Feng Zhang
Keyword(s):  
Vanadium Oxide ◽  
Single Crystal ◽  
Interlayer Space ◽  
Mixed Valence ◽  
Vanadium Oxides ◽  
Cluster Anions ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Molar Ratios

Two vanadium oxides [Ni(en)2(H2O)2][Ni(en)3]2[V16O38Cl] ・3(H2O) (1) (en = ethylenediamine) and (H3O)2 V3O8 (2) were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. 1 consists of [Ni(en)2(H2O)2]2+ and [Ni(en)3]2+ cations, discrete [V16O38Cl]6− cluster anions and H2O molecules, while 2 consists of anionic mixed-valent V5+/V4+ vanadium oxide layers constructed from pairs of corner-sharing VVO4 tetrahedra and VIVO5 square pyramids, with H3O+ cations occupying the interlayer space. Both 1 and 2 were synthesized under the same reaction conditions but with different V/Ni molar ratios, which shows that the reactant stoichiometry of the system plays a key role in the formation of different structures in the products.

Investigation of Single Crystal Zircon, (Zr,Pu)SiO4, Doped with 238Pu

2002 ◽  
Vol 757 ◽  
Author(s):  
John M. Hanchar ◽  
Boris E. Burakov ◽  
Evgeniy B. Anderson ◽  
Maria V. Zamoryanskaya
Keyword(s):  
Single Crystal ◽  
Radiation Damage ◽  
Synthesis Method ◽  
X Ray Diffraction ◽  
Α Decay ◽  
Cell Parameters ◽  
Flux Synthesis ◽  
Short Period ◽  
A Cell ◽  
First Time

ABSTRACTSingle crystals of 238Pu doped zircon (from 0.3 to 3.5 mm in size) were successfully grown for the first time ever using a Li-Mo flux synthesis method. The incorporation of Pu ranged from 1.9 to 4.7 wt. % el. (with approximately 81 wt.% of 238Pu isotope). The crystals obtained were pink-brown, and then over a period of five months changed to a brown color, and glow in the dark. The intensity of the CL emission in the Pu doped crystals is correlated with the Pu content, and the CL emission showed no change 141 days after the initial CL measurements were made. Single crystal X-ray diffraction results obtained 141 days after synthesis indicate unit cell parameters (in angstroms): a = 6.6267(15), c = 5.9992(10) and a cell volume of 263.41(10). Radiation damage calculations indicate that after only a short period of time, six months (∼3.3 ×1014 α-decay events per milligram), these zircon crystals have already accumulated significant α-induced radiation damage.

scholarly journals Hydro-treating and Hydro-isomerisation of Sunflower Oil using Pt/SAPO-11: Influence of Templates in Ultrasonic Assisted with Hydrothermal Synthesis

2021 ◽  
Vol 16 (1) ◽  
pp. 120-135
Author(s):  
Shanmugam Palanisamy ◽  
Durona Palanisamy ◽  
Mugaishudeen Gul ◽  
Kannan Kandasamy ◽  
Borje Sten Gevert
Keyword(s):  
Hydrothermal Treatment ◽  
Sunflower Oil ◽  
Synthesis Method ◽  
Fixed Bed ◽  
Space Velocity ◽  
Major Effect ◽  
Fixed Bed Reactor ◽  
X Ray Diffraction ◽  
Structure Directing Agent ◽  
Ultrasonic Assisted

Pt/SAPO-11 mesopores type materials has successfully synthesized using different templates, such as: diethylamine (DEA), dimethylamine (DMA), and n-propylamine (n-PA), under ultrasonication coupled with hydrothermal treatment or independently with hydrothermal treatment. The influences of structure directing agent (SDA) and synthesis method are investigated by different characterization techniques and the role of the material as catalyst in hydrotreating of sunflower oil has examined. The synthesized materials have been characterized by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Fourier Transform Infra Red (FT-IR) techniques. It is found that SAPO-11 material which has synthesized with n-PA as a template has the characteristics of high silicon incorporation. Hydrotreating of sunflower oil is carried out in a fixed bed reactor with Pt impregnated SAPO-11 catalyst and a detailed study on the isomerization is performed by varying the operating parameters like temperature and space velocity. The high selectivity of Pt/SAPO-11 catalyst is achieved by uniform pore size and acidity. Also the pore opening of the catalyst has a major effect in the selectivity of the catalyst. Further, it represents a higher ratio of isomers compared to other synthesized catalysts on hydro-treating of sunflower oil.  Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

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