Untersuchung der kristallinen Strukturen in Depotfetten von Tieren mittels Röntgenbeugungsmethoden / Investigation of Crystalline Structures in Fats of Animals by X-Ray Scattering

1978 ◽  
Vol 33 (1-2) ◽  
pp. 28-38
Author(s):  
H. Wawra
Keyword(s):  
Density Distribution ◽  
Temperature Region ◽  
Intensity Distribution ◽  
Small Angle ◽  
Electron Density Distribution ◽  
Fat Crystals ◽  
X Ray ◽  
X Ray Scattering ◽  
Small Angle Region ◽  
Ray Scattering

Abstract Fat-praeparates of cow and pork have been investigated by small-angle X-ray scattering methods. Dependent on the temperature these fats show distinct X-ray interference patterns in the small-angle region. Hence complete phasediagrams of the fats in the temperature region between -20 °C and 55 °C could be estimated. Using the intensity distribution of the X-ray scattering the electron-density distribution along one direction of the ground-cells of the fat crystals were calculated.

Interpretation of small-angle x-ray scattering intensity distribution from fluctuating lamellae in a ternary system: sodium octyl sulfate-water-decanol

Langmuir ◽  
1991 ◽  
Vol 7 (9) ◽  
pp. 1895-1899
Author(s):  
Eric Y. Sheu ◽  
Sow Hsin. Chen ◽  
Bruce L. Carvalho ◽  
J. S. Lin ◽  
Malcolm. Capel
Keyword(s):  
Ternary System ◽  
Intensity Distribution ◽  
Small Angle ◽  
Scattering Intensity ◽  
X Ray ◽  
X Ray Scattering ◽  
System Sodium ◽  
Ray Scattering

scholarly journals Structure of nanoscale-pitch helical phases: blue phase and twist-bend nematic phase resolved by resonant soft X-ray scattering

Soft Matter ◽  
2017 ◽  
Vol 13 (38) ◽  
pp. 6694-6699 ◽  
Author(s):  
Mirosław Salamończyk ◽  
Nataša Vaupotič ◽  
Damian Pociecha ◽  
Cheng Wang ◽  
Chenhui Zhu ◽  
...  
Keyword(s):  
Density Distribution ◽  
Nematic Phase ◽  
Electron Density Distribution ◽  
Periodic Structures ◽  
Orientational Order ◽  
Cholesteric Phase ◽  
X Ray ◽  
X Ray Scattering ◽  
Blue Phase ◽  
Ray Scattering

Periodic structures of phases with orientational order of molecules but homogenous electron density distribution: short pitch cholesteric phase, blue phase and twist-bend nematic phase, were probed by resonant soft X-ray scattering (RSoXS) at the carbon K-edge.

scholarly journals X-Ray scattering at the periphery : forbidden bragg reflections and silicon nanowire arrays

2018 ◽  
Author(s):  
◽  
Jesse Wade Kremenak
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Crystal Surface ◽  
Structural Information ◽  
Covalent Bond ◽  
Nanowire Arrays ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

In this work, we developed two separate unconventional X-ray scattering techniques that enable us to extract novel information from distinct systems at disparate length scales. We examine the formation of Si nanowire (SiNW) arrays during Ag metal-assisted chemical etching (MACE). The exceptionally rough surface of these nanowire arrays result in very low optical reflectivity, which also makes it extremely challenging to measure the X-ray specular reflection can be measured and utilized to obtain unique structural information about the composition profile of both Ag and Si during the formation of the SiNWs. Secondly, we have discovered a novel interference effect between the crystal surface and the bulk forbidden Bragg reflection that allows - for the first time - both the amplitude and phase of the forbidden reflection to be resolved. The newly attained amplitude and phase information permits one to extract the structure of the non-spherical electron density distribution from diamond crystal structures. We employed X-ray specular reflectivity, a technique conventionally used to study interfaces and surfaces, to examine the non-spherical electron density distribution of bulk Si. We have discovered and demonstrated that the structure of the covalent bond can be ascertained from the weak scattering between the Bragg reflections along the crystal truncation rod. This discovery significantly expands the experimental capability of examining the structure of electron densities, and especially the valence electrons in crystals. Using these novel and unconventional X-ray scattering techniques, we were able to extract valuable information about each system from exceptionally faint signals.

Structural studies on fluid Hg and fluid Se at high temperatures and high pressures by means of X-ray diffraction and small angle X-ray scattering

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Masanori Inui ◽  
Yukio Kajihara ◽  
Kozaburo Tamura
Keyword(s):  
Small Angle ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Saxs Intensity ◽  
Dense Vapor ◽  
Vapor Region ◽  
Small Angle Region ◽  
Ray Scattering

AbstractX-ray diffraction (XRD) and small angle X-ray scattering (SAXS) measurements for fluid Hg and fluid Se up to the supercritical region have been carried out using synchrotron radiation at SPring-8. We obtained the structure factor, $S\left(Q\right)$, including a small angle region, and the pair distribution function, $g\left(r\right)$, for both fluids from the liquid to the dense vapor region. Change of the local structure and medium-range correlations at the metal-insulator transition in fluid Hg were revealed. On the other, the average coordination number of two was preserved at the semiconductor-metal transition in fluid Se. From a SAXS experiment of fluid Se in 2012, SAXS spectra near the semiconductor-metal transition region show the Ornstein–Zernike profile and the SAXS intensity is reduced with increasing pressure. These results indicate difficulties of separating fluctuations intrinsic to the semiconductor-metal transition from those arising from the liquid-vapor critical point in fluid Se, although fluctuations intrinsic to the electronic transitions are largely expected in both fluids.

scholarly journals Small Angle X-ray Scattering Study for Structure Analysis of Fat Crystals in Solid Fat for Foods

1995 ◽  
Vol 44 (5) ◽  
pp. 361-365
Author(s):  
Satoru UENO ◽  
Megumi WADA ◽  
Naoko YAGISAWA ◽  
Akiyoshi MINATO ◽  
Junko YANO ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Small Angle ◽  
Fat Crystals ◽  
Solid Fat ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

A Revised O2 Reduction Model in Li-O2 Batteries as Revealed by in Situ Small Angle X-Ray Scattering

2019 ◽  
Author(s):  
Christian Prehal ◽  
Aleksej Samojlov ◽  
Manfred Nachtnebel ◽  
Manfred Kriechbaum ◽  
Heinz Amenitsch ◽  
...  
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
Reduction Mechanism ◽  
Reduction Model ◽  
X Ray ◽  
X Ray Scattering ◽  
O2 Reduction ◽  
Ray Scattering

<b>Here we use in situ small and wide angle X-ray scattering to elucidate unexpected mechanistic insights of the O2 reduction mechanism in Li-O2 batteries.<br></b>

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