Structural characterisation of organometallic intercalates of SnSe2 and ZrS2 by neutron and X-ray diffraction

1993 ◽  
pp. 1589 ◽  
Author(s):  
Heng-Vee Wong ◽  
John S. O. Evans ◽  
Stephen Barlow ◽  
Dermot O'Hare
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Structural Characterisation

Applications of High-Resolution Powder X-Ray Diffraction

2007 ◽  
Vol 130 ◽  
pp. 7-14 ◽  
Author(s):  
Andrew N. Fitch
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Powder Diffraction ◽  
X Rays ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray ◽  
Structural Characterisation ◽  
Pdf Analysis

The highly-collimated, intense X-rays produced by a synchrotron radiation source can be harnessed to build high-resolution powder diffraction instruments with a wide variety of applications. The general advantages of using synchrotron radiation for powder diffraction are discussed and illustrated with reference to the structural characterisation of crystalline materials, atomic PDF analysis, in-situ and high-throughput studies where the structure is evolving between successive scans, and the measurement of residual strain in engineering components.

Isomers of B20H26: structural characterisation by X-ray diffraction of 2,2′-Bi(nido-decaboranyl)

1979 ◽  
pp. 17-18 ◽  
Author(s):  
Norman N. Greenwood ◽  
John D. Kennedy ◽  
Walter S. McDonald ◽  
John Staves ◽  
Derek Taylorson
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Structural Characterisation

scholarly journals Structural Characterisation and Mechanical FE Analysis of Conventional and M-Wire Ni-Ti Alloys Used in Endodontic Rotary Instruments

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Diogo Montalvão ◽  
Francisca Sena Alçada ◽  
Francisco Manuel Braz Fernandes ◽  
Sancho de Vilaverde-Correia
Keyword(s):  
Body Temperature ◽  
Mechanical Response ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Austenitic Phase ◽  
X Ray ◽  
Structural Characterisation ◽  
Working Temperature ◽  
Ti Alloys ◽  
Rotary Instruments

The purpose of this study is to understand how the M-Wire alloy conditions the mechanical flexibility of endodontic rotary files at body temperature.Two different rotary instruments, a Profile GT 20/.06 and a Profile GT Series X 20/.06, were selected due to their geometrical similarity and their different constituent alloy. GT series X files are made from M-Wire, a Ni-Ti alloy allegedly having higher flexibility at body temperature. Both files were analysed by X-Ray Diffraction and Differential Scanning Calorimetry to investigate phase transformations and the effects of working temperature on these different alloys. Mechanical behaviour was assessed by means of static bending and torsional Finite Element simulations, taking into account the nonlinear superelastic behaviour of Ni-Ti materials. It was found that GT files present austenitic phase at body temperature, whereas GT series X present R-phase at temperatures under 40°C with a potential for larger flexibility. For the same load conditions, simulations showed that the slight geometrical differences between the two files do not introduce great disagreement in the instruments’ mechanical response. It was confirmed that M-Wire increases the instrument’s flexibility, mainly due to the presence of R-phase at body temperature.

Synthesis and Structural Characterisation of a Hexanuclear TiIV Compound Ti6(μ2-O)2(μ3-O)2(μ2-OC4H9)2(OC4H9)6(OOCCHCl2)8

2010 ◽  
Vol 65 (2) ◽  
pp. 147-151 ◽  
Author(s):  
Ashutosh Pandey ◽  
Anjana Pandey ◽  
Sadhana Singh ◽  
Peter Mayer ◽  
Wolfgang J. Parakd
Keyword(s):  
Ambient Temperature ◽  
Toluene Solution ◽  
Dichloroacetic Acid ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Characterisation ◽  
Hexanuclear Complex

Titanium tetra-butoxide was reacted with dichloroacetic acid in 1 : 1 and 1 : 2 molar ratio in toluene at ambient temperature to give, respectively, the mono- and bis-substituted products Ti(OBun)3(OOCCHCl2) and Ti(OBun)2(OOCCHCl2)2 (1) in quantitative yields. However, when a toluene solution of compound 1 was kept at −20 ◦C for crystallisation, colourless crystals of a hexanuclear complex Ti6(μ2-O)2(μ3-O)2(μ2-OC4H9)2(OC4H9)6(OOCCHCl2)8 (2) were obtained. The basic skeletal arrangement of compound 2, as revealed by X-ray diffraction, can be described as corner-removed, inversion-related [Ti-O]4 cubes with face-linked oxide bridges.

Structural Characterisation of Cellulose and Nanocellulose Extracted from Mengkuang Leaves

2012 ◽  
Vol 545 ◽  
pp. 119-123 ◽  
Author(s):  
Rasha M.El. Sheltami ◽  
Ibrahim Abdullah ◽  
Ishak Ahmad
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Structural Analysis ◽  
Transmission Electron Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Characterisation ◽  
Transmission Electron ◽  
Pandanus Tectorius

Nanocellulose was isolated from mengkuang leaves (Pandanus tectorius) by using concentrated sulphuric acid. The structural analysis of the leaves at different stages of treatments was performed by fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Transmission electron microscope (TEM) was used to investigate the dimensions of the isolated nanocellulose. The FTIR and XRD results indicated that the hemicelluloses and lignin were removed extensively in the extracted cellulose and nanocellulose, and the crystallinity were increased after removing these components. The TEM image showed that the diameter of isolated nanocellulose between 5-25 nm. The isolated nanocellulose may have applications in the fields of nanocomposites.

Mo-W-O thin films for CO sensing

2000 ◽  
Vol 638 ◽  
Author(s):  
Elisabetta Comini ◽  
Matteo Ferroni ◽  
Vincenzo Guidi ◽  
Giuliano Martinelli ◽  
Michele Sacerdoti ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Weight Ratio ◽  
X Ray Diffraction ◽  
Composite Target ◽  
X Ray ◽  
Structural Characterisation ◽  
Gas Sensing Properties ◽  
Recovery Times ◽  
Response And Recovery

AbstractThe Mo-W-O thin films were deposited by RF reactive sputtering from composite target of W and Mo (20:80 weight ratio). Structural characterisation was carried out by X-ray diffraction spectroscopy and the composition of the film was obtained by Rutherford backscattering analysis. The layers were investigated by volt-amperometric technique for electrical and gas-sensing properties. The films were capable of sensing CO. No effect of poisoning of the surface was recorded and recovery of the resistance was complete. A concentration of CO as low as 15 ppm produced a relative variation in the conductance of 390% with response and recovery times of about 2 minutes at a working temperature of 200°C.

scholarly journals Structural Characterisation and Mechanical Stability of Titanium Substituted Mesoporous Materials

2010 ◽  
Vol 636-637 ◽  
pp. 136-141
Author(s):  
Cristina Galacho ◽  
Manuela M.L. Ribeiro Carrott ◽  
Joana Valerio ◽  
Peter J.M. Carrott ◽  
J.M. Valente Nabais
Keyword(s):  
Mesoporous Materials ◽  
Mechanical Stability ◽  
Nitrogen Adsorption ◽  
Mesoporous Structure ◽  
External Pressure ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Structural Characterisation

Mesoporous silica and titanium SBA-15 samples with different Si/Ti molar ratio were prepared by direct one-step synthesis under strongly acidic hydrothermal conditions. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77K. The Si/Ti values of the final calcined materials were determined by ICP analysis. It was found that all samples presented 2-D hexagonal structures with high degree of ordering. However, the metal content incorporated in all titanium mesoporous materials was very low, i.e., the Si/Ti molar ratio values of the final calcined samples are significantly different from the initial Si/Ti molar ratio in the synthesis gel. A study of mechanical stability in air was performed by exposing the calcined samples to a unidirectional external pressure in the range 74-814MPa. X-ray diffraction and nitrogen adsorption at 77K, on selected compacted samples, were used in order to evaluate the changes in mesoporous structure. It was found that, for all freshly calcined pure silica and titanium containing samples tested, the high quality SBA-15 structure is still observed after the application 148-370MPa of a unidirectional external pressure and the collapse of the pore structure occurs at around 814MPa.

scholarly journals Efficient synthesis of Triazolo[4,5-d]pyrimidine-7-carbonitriles and Imidazole-4,5-dicarbonitriles using Triethylorthoalkylates and their structural characterisation by Single-crystal x-ray diffraction

2021 ◽  
Vol 48 (2) ◽  
Author(s):  
Amal Al-Azmi ◽  
◽  
Mickey Vinodh ◽  
Keyword(s):  
Single Crystal ◽  
Intermolecular Interactions ◽  
Diffraction Method ◽  
Structural Features ◽  
Quantitative Information ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Characterisation ◽  
13C Nuclear Magnetic Resonance ◽  
Comprehensive Study

Cyclisation of 5-amino-1-(4-nitrophenyl)-1H-1,2,3-triazole-4-carbimidoyl cyanide and 3-amino-3-((Z)-2-cyano-2-phenylvinylamino)maleonitrile using either triethyl orthoformate or triethyl orthopropionate in dimethylformamide (DMF):1,4-dioxane (1:1 v/v) mixture under reflux conditions afforded 5-alkyl-3-(4-nitrophenyl)-3H-[1,2,3]triazolo[4,5-d]pyrimidine-7-carbonitriles and (Z)-1-(2-cyano-2-phenylvinyl)-2-alkyl-1H-imidazole-4,5-dicarbonitriles, respectively, in moderate to good yields. The structures of these novel compounds were confirmed with 1H/13C nuclear magnetic resonance (NMR), infrared spectroscopy (IR), and high-resolution mass spectroscopic methods. Two representative compounds from these molecules, namely 5-ethyl-3-(4-nitrophenyl)-3H-[1,2,3]triazolo[4,5-d]pyrimidine-7-carbonitrile and (Z)-1-(2-cyano-2-phenylvinyl)-1H-imidazole-4,5-dicarbonitrile, were further analysed by the single-crystal X-ray diffraction method. A comprehensive study of structural features and intermolecular interactions present among these heterocyclic compounds was carried out. The crystal data were further examined by a Hirshfeld surface analysis, which provided qualitative and quantitative information on various intermolecular interactions experienced within the crystal network.

scholarly journals The structural characterisation of HWCVD-deposited nanocrystalline silicon films

2009 ◽  
Vol 105 (1/2) ◽  
Author(s):  
Bibhu P. Swain
Keyword(s):  
Vapour Deposition ◽  
Chemical Vapour ◽  
Nanocrystalline Silicon ◽  
X Ray Diffraction ◽  
Crystalline Fraction ◽  
X Ray ◽  
Structural Characterisation ◽  
X Ray Scattering ◽  
Si Films ◽  
Guinier Plot

Nanocrystalline silicon (nc-Si) films were deposited by hot-wire chemical vapour deposition (HWCVD) in the presence of varying H2 concentrations and their structural and interfacial character investigated by X-ray diffraction, small-angle X-ray scattering (SAXS) and Raman spectroscopy. The crystalline fraction was around 30–50% and the nc-Si crystallite size was in the range 20–35 nm. The SAXS results were analysed by Guinier plot, scaling factor, and correlation distance. The nc-Si grains displayed a mass fractal appearance, and the interfacial inhomogeneity distance was ~2 nm.

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