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 Orientational order in the splay nematic ground state

2019 ◽  
Vol 21 (34) ◽  
pp. 18769-18772 ◽  
Author(s):  
Richard J. Mandle ◽  
Alenka Mertelj
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Ground State ◽  
Nematic Phase ◽  
Orientational Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

We measure the degree of orientational order in the recently discovered splay-nematic liquid crystal (NS) phase by X-ray scattering techniques. We find the NS phase to be more ordered than the classical nematic phase, although still nematic-like.

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.

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.

scholarly journals Optical and X-ray scattering studies of the electric field-induced orientational order in colloidal suspensions of pigment nanorods

2018 ◽  
Vol 267 ◽  
pp. 286-296 ◽  
Author(s):  
Oleksandr Buluy ◽  
Natalie Aryasova ◽  
Oleksandr Tereshchenko ◽  
Yuriy Kurioz ◽  
Vassili Nazarenko ◽  
...  
Keyword(s):  
Electric Field ◽  
Orientational Order ◽  
Colloidal Suspensions ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering
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