X-ray diffraction and 1h and 51V NMR study of the structure of a TiVH alloy in relation to preparation conditions

1986 ◽  
Vol 123 (1-2) ◽  
pp. 75-84 ◽  
Author(s):  
Bogdan Nowak ◽  
Shigenobu Hayashi ◽  
Kikuko Hayamizu ◽  
Osamu Yamamoto
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
51V Nmr ◽  
Preparation Conditions ◽  
Nmr Study

X-ray diffraction and 1H and 51V NMR study of the TiVH system

1990 ◽  
Vol 161 (1) ◽  
pp. 61-75 ◽  
Author(s):  
Shigenobu Hayashi ◽  
Kikuko Hayamizu
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
51V Nmr ◽  
Nmr Study

The 3-Dimensional Molecular Structure of the Actin Filament Revisited

1985 ◽  
Vol 43 ◽  
pp. 480-481
Author(s):  
U. Aebi ◽  
R. Millonig ◽  
H. Salvo
Keyword(s):  
Actin Filament ◽  
Supramolecular Assembly ◽  
Specimen Preparation ◽  
X Ray Diffraction ◽  
Single Filament ◽  
X Ray ◽  
3 Dimensional ◽  
Filament Diameter ◽  
Preparation Conditions ◽  
Apparent Diameter

To date, most 3-D reconstructions of undecorated actin filaments have been obtained from actin filament paracrystal data (for refs, see 1,2). However, due to the fact that (a) the paracrystals may be several filament layers thick, and (b) adjacent filaments may sustantially interdigitate, these reconstructions may be subject to significant artifacts. None of these reconstructions has permitted unambiguous tracing or orientation of the actin subunits within the filament. Furthermore, measured values for the maximal filament diameter both determined by EM and by X-ray diffraction analysis, vary between 6 and 10 nm. Obviously, the apparent diameter of the actin filament revealed in the EM will critically depend on specimen preparation, since it is a rather flexible supramolecular assembly which can easily be bent or distorted. To resolve some of these ambiguities, we have explored specimen preparation conditions which may preserve single filaments sufficiently straight and helically ordered to be suitable for single filament 3-D reconstructions, possibly revealing molecular detail.

scholarly journals Tautomerisation in 1-(4-Methylphenylazo)naphthalen-2-ol and 2-(4-Methylphenylazo)-4-methylphenol: A Crystallographic and 13C{1H}NMR Study

1999 ◽  
Vol 23 (3) ◽  
pp. 178-179
Author(s):  
Wendy I. Cross ◽  
Kevin R. Flower ◽  
Robin G. Pritchard
Keyword(s):  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Resonant Frequency ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Nmr Study ◽  
Acetic Acid Esters ◽  
Acid Esters ◽  
Equivalent Carbon

The acetic acid esters of 1-(4-methylphenylazo)naphthalen-2-ol 1 and 2-(4-methylphenylazo)-4-methylphenol 3 are prepared and characterised by single crystal X-ray diffraction studies and 13C{1H}NMR spectroscopy; the position of the C(2)13C resonance for the ester is used to predict the position of resonant frequency of the equivalent carbon in the parent alcohols and hence, calculate the position of the azo-hydrazone equilibrium in these compounds.

X-ray diffraction and NMR study on the structure of Co/Cu superlattices with artificially modified interfaces

1994 ◽  
Vol 50 (24) ◽  
pp. 18580-18585 ◽  
Author(s):  
Motofumi Suzuki ◽  
Yasunori Taga ◽  
Atsushi Goto ◽  
Hiroshi Yasuoka
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Nmr Study

Gold nanoclusters reductively deposited on porous silicon: morphology and electronic structures

1998 ◽  
Vol 76 (11) ◽  
pp. 1707-1716 ◽  
Author(s):  
I Coulthard ◽  
S Degen ◽  
Y -J Zhu ◽  
T K Sham
Keyword(s):  
Gold Nanoparticles ◽  
Porous Silicon ◽  
Photoelectron Spectroscopy ◽  
Gold Nanoclusters ◽  
Gold Complex ◽  
X Ray Diffraction ◽  
Complex Ions ◽  
X Ray ◽  
Preparation Conditions ◽  
P Type

Utilizing porous silicon as a reducing agent and a substrate, gold complex ions [AuCl4]- were reduced from aqueous solution to produce nanoparticles of gold upon the surface of porous silicon. Scanning electron microscopy (SEM) was utilized to study the morphology of the porous silicon layers and the deposits of gold nanoparticles. It is found that preparation conditions have a profound effect on the morphology of the deposits, especially on porous silicon prepared from a p-type wafer. The gold nanoparticles, varying from micrometric aggregates of clusters of the order of 10 nm, to a distribution of nearly spherical clusters of the order of 10 nm, to strings of ~10 nm were observed and compared to bulk gold metal using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS). These techniques confirm and complement the SEM findings. The potential for this reductive deposition technique is noted.Key words: gold nanostructures, reductive deposition, porous silicon, morphology, X-ray spectroscopy.

The Effects of Preparation Conditions And Chemical Composition On CMAS Glass Ceramics With One Step Process

2021 ◽  
Author(s):  
Yuliang Guo ◽  
Huixin Jin ◽  
Yuandan Xiao ◽  
Huahao Song ◽  
Shangjiefu Wang
Keyword(s):  
Solid Waste ◽  
Theoretical Basis ◽  
Chromium Content ◽  
Glass Ceramics ◽  
X Ray Diffraction ◽  
Crystallization Activation Energy ◽  
X Ray ◽  
Preparation Conditions ◽  
Treatment Conditions ◽  
One Step

Abstract Based on the composition of Cr-doped solid waste, other oxides were added to adjust the composition to prepare glass-ceramics with on step composition, and the effect of heat treatment system (including temperature and holding time), chromium content, MnO and Fe2O3 doped on the crystallization and physical properties of glass-ceramics was studied. The samples were characterized by X-ray diffraction, differential thermal analysis and scanning electron microscopy. The results show that the best treatment conditions are 1090 ℃ for 4h, and the amount of dissolved chromium reaches 5%. The main crystallization phase is diopside and anorthite. The hardness and chemical stability of the material were measured. The doping of MnO and Fe2O3 increases the crystallization activation energy of glass ceramics, and makes the crystal phase more uniform as the SEM results. This experiment provides a theoretical basis for the preparation of CMAS glass ceramics from chromium containing solid waste.

Combined X-ray Diffraction and15N CPMAS NMR Study of Molecular Structure and Proton Order/Disorder Phenomena in CyclicN,N‘-Bisarylformamidine Dimers

1997 ◽  
Vol 119 (50) ◽  
pp. 12223-12230 ◽  
Author(s):  
Romana Anulewicz ◽  
Iwona Wawer ◽  
Tadeusz Marek Krygowski ◽  
Ferdinand Männle ◽  
Hans-Heinrich Limbach
Keyword(s):  
Molecular Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nmr Study

The Structure of a Zn(II) Metaphosphate Glass. I. The Cation Coordination by a Combination of X-Ray and Neutron Diffraction, EXAFS and X-Ray Anomalous Scattering

1996 ◽  
Vol 51 (12) ◽  
pp. 1209-1215 ◽  
Author(s):  
M. Bionducci ◽  
G. Licheri ◽  
A. Musinu ◽  
G. Navarra ◽  
G. Piccaluga ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Anomalous Scattering ◽  
Extended Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preparation Conditions ◽  
Zinc Coordination ◽  
Cation Coordination ◽  
X Ray Absorption ◽  
Zn Ions

Abstract In order to clarify the reason of some discrepancies existing in literature, the zinc coordination in a Zn metaphosphate glass has been investigated by the complementary use of X-Ray Diffraction, Neutron Diffraction, Extended X-ray Absorption Fine Structure Spectroscopy and X-Ray Anoma-lous Scattering. All the techniques indicate a tetrahedral coordination of O atoms around Zn :+ ions, the Zn-O distance being 1.94 ± 0.01 Å. The simultaneous modelling of all the experimental data by Reverse Monte Carlo technique demonstrated that this coordination is consistent with an extended model in which metal ions are interposed between phosphate chains. The importance of describing the preparation conditions of the glasses is stressed when structural results have to be compared.

Structure of Ti1−yVyHx alloys studied by X-ray diffraction and by 1H and 51V NMR

1983 ◽  
Vol 46 (3) ◽  
pp. 306-312 ◽  
Author(s):  
Shigenobu Hayashi ◽  
Kikuko Hayamizu ◽  
Osamu Yamamoto
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
51V Nmr
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