X-Ray Diffraction in Ethyl Ether near the Critical Point

1932 ◽  
Vol 42 (3) ◽  
pp. 336-339 ◽  
Author(s):  
F. H. Waldemar Noll
Keyword(s):  
Critical Point ◽  
Ethyl Ether ◽  
X Ray Diffraction ◽  
X Ray

Orientations of Recrystallization Nuclei Studied by 3DXRD

2005 ◽  
Vol 495-497 ◽  
pp. 1285-1290 ◽  
Author(s):  
Dorte Juul Jensen ◽  
A.W. Larsen
Keyword(s):  
Critical Point ◽  
Boundary Migration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deformation Microstructure ◽  
3 Dimensional ◽  
Nucleation Mechanisms ◽  
Crystallographic Orientations

A critical point in the understanding of recrystallization textures is the development of crystallographic orientations of the nuclei. Here an issue, which has been debated much recently [eg. 1], is if nuclei have orientations identical to those of the deformation microstructures from which they originate or not. Traditional nucleation mechanisms like strain induced boundary migration [2] and particle stimulated nucleation [3] operate with nuclei orientations identical to the “parent”deformation microstructure. This is also what is commonly incorporated in recrystallization modeling. However, a number of studies have found recrystallization nuclei in orientations that were not expected from measurements on deformed structures. Some of these results are reviewed and discussed in this paper, and new in-situ results obtained by the 3 dimensional X-ray diffraction (3DXR) method are presented.

The Synthesis and X-Ray Crystal Structure of t-Butyldimethylsilyl 2-[4-{4-(Hex-5-enyloxy)-phenylazo} phenyl]ethyl Ether

1998 ◽  
Vol 51 (11) ◽  
pp. 1053 ◽  
Author(s):  
Daniel E. Lynch ◽  
Michael G. Forkan ◽  
L. Sid Miller ◽  
Simon Parsons
Keyword(s):  
Crystal Structure ◽  
Ethyl Ether ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Pendent Groups

t-Butyldimethylsilyl 2-[4-{4-(hex-5-enyloxy)phenylazo}phenyl]ethyl ether (1) was synthesized on route to a polysiloxane system with azobenzene pendent groups. Compound (1) produced clear, orange-coloured crystals (space group P -1 with aa6·346(2), b 7·602(2),c 28·706(8) Å, α 89·84(2), β 85·17(2), γ 72· 29(2)°, Z 2) which allowed the structure to be determined by X-ray diffraction.

scholarly journals Possible quantum fluctuations in the vicinity of the quantum critical point of (Sr,Ca)3Ir4Sn13 revealed by high-energy x-ray diffraction

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
L. S. I. Veiga ◽  
J. R. L. Mardegan ◽  
M. v. Zimmermann ◽  
D. T. Maimone ◽  
F. B. Carneiro ◽  
...  
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Fluctuations ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Quantum Critical

scholarly journals [Oxybis(ethane-1,2-diyl)]bis(dimethylammonium) octamolybdate dihydrate

IUCrData ◽  
2019 ◽  
Vol 4 (11) ◽  
Author(s):  
David M. Ermert ◽  
Milan Gembicky ◽  
Arnold L. Rheingold
Keyword(s):  
Hydrogen Bonds ◽  
Ethyl Ether ◽  
Three Dimensional ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compound C ◽  
Dimensional Network ◽  
Anionic Cluster ◽  
Solvothermal Conditions

The title compound, (C8H22N2O)2[Mo8O26]·H2O, (cis-H2 L)2[β-Mo8O26]·H2O, where L = (bis[2-N,N-dimethylamino)ethyl] ether), was synthesized from bis[2-(dimethylamino)ethyl] ether and MoO3 under solvothermal conditions and characterized by multinuclear NMR and single-crystal X-ray diffraction techniques. The structure displays two [oxybis(ethane-1,2-diyl)]bis(dimethylammonium), or [cis-H2 L]2+, cations, a central [β-Mo8O26]4− anionic cluster consisting of eight distorted MoO6 octahedra, and two water molecules in their deuterated form. The central anion lies across an inversion center. The [cis-H2 L]2+ cations are hydrogen bonded to the central [β-Mo8O26]4− cluster via bridging water molecules. In the crystal, O—H...O hydrogen bonds link the components into chains along [010]. Weak C—H...O hydrogen bonds link these chains into a three-dimensional network.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Ribosome Structural Organization

1974 ◽  
Vol 32 ◽  
pp. 332-333
Author(s):  
James A. Lake
Keyword(s):  
Ribosomal Proteins ◽  
Structural Organization ◽  
Three Dimensional ◽  
Small Subunit ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
Specific Antibodies ◽  
X Ray ◽  
E Coli ◽  
Complete Sequences

The understanding of ribosome structure has advanced considerably in the last several years. Biochemists have characterized the constituent proteins and rRNA's of ribosomes. Complete sequences have been determined for some ribosomal proteins and specific antibodies have been prepared against all E. coli small subunit proteins. In addition, a number of naturally occuring systems of three dimensional ribosome crystals which are suitable for structural studies have been observed in eukaryotes. Although the crystals are, in general, too small for X-ray diffraction, their size is ideal for electron microscopy.

Electron Microscopy of Human Gallstones

1971 ◽  
Vol 29 ◽  
pp. 296-297
Author(s):  
C. Wolpers ◽  
R. Blaschke
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bile Pigment ◽  
X Ray Diffraction ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Follow Up Study ◽  
Infra Red ◽  
Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

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