scholarly journals Small-angle X-ray (SAXS) and Raman spectroscopy studies of biot-CMG(2)-DOPE quasicrystalline phases

2021 ◽  
Vol 2058 (1) ◽  
pp. 012018
Author(s):  
A M Maslennikov ◽  
A V Zalygin ◽  
E V Shtykova ◽  
N V Bovin ◽  
V A Oleinikov
Keyword(s):  
Raman Spectroscopy ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Structural Data ◽  
Quasicrystalline Phase ◽  
Saxs Data ◽  
X Ray ◽  
Structured System ◽  
High Concentrations ◽  
Spectroscopy Studies

Abstract Neoglycolipids due to their amphiphilic properties exhibit self-assembly in aqueous phases. In high concentrations the liquid crystalline or gel phases may form. So-called soft-material are a subject of interest of many scientists especially as biosensors and wound healing materials. In this study we examine the structure of a quasicrystalline phase of biot-CMG(2)-DOPE obtained at the concentration of 150 mg/ml (13wt.%) in PBS. The structural data such as interplanar spacing, order parameter and long-range order were obtained by SAXS, while the changes in chemical structure were studied by Raman spectroscopy. It was also in our interest to examine a correlation between the ionic strength and the self-assembly, so we also studied a similar quasicrystalline phase of the same compound but in a buffer containing CaCl2 at the concentration of 4wt.%. According to SAXS data, FSL-biotin construct formed a complex ordered phase consisting of overlapping latices of different kind. The addition of CaCl2 into PBS resulted in obtaining a more structured system demonstrating cubic-like crystal lattice. Change in peak intensities on Raman spectrums of -C-H- and -C-C- bonds vibrations explained the change in phase properties.

Deposition of TRISO Particles With Superhard SiC Coatings and the Characterization of Anisotropy by Raman Spectroscopy

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
E. López-Honorato ◽  
P. J. Meadows ◽  
J. Tan ◽  
Y. Xiang ◽  
P. Xiao
Keyword(s):  
Solid Solution ◽  
Raman Spectroscopy ◽  
Pyrolytic Carbon ◽  
X Ray Diffraction ◽  
X Ray ◽  
Flat Substrate ◽  
High Concentrations ◽  
Triso Particles ◽  
Sic Coatings

In this work we have deposited silicon carbide (SiC) at 1300°C with the addition of small amounts of propylene. The use of propylene and high concentrations of methyltrichlorosilane (9 vol %) allowed the deposition of superhard SiC coatings (42 GPa). The superhard SiC could result from the presence of a SiC–C solid solution, undetectable by X-ray diffraction but visible by Raman spectroscopy. Another sample obtained by the use of 50 vol % Argon, also showed the formation of SiC with good properties. The use of a flat substrate together with the particles showed the importance of carrying out the analysis on actual particles rather than in flat substrates. We show that it is possible to characterize the anisotropy of pyrolytic carbon by Raman spectroscopy.

scholarly journals Improving the reactivity of phenylacetylene macrocycles toward topochemical polymerization by side chains modification

2014 ◽  
Vol 10 ◽  
pp. 1613-1619 ◽  
Author(s):  
Simon Rondeau-Gagné ◽  
Jules Roméo Néabo ◽  
Maxime Daigle ◽  
Katy Cantin ◽  
Jean-François Morin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Self Assembly ◽  
Significant Enhancement ◽  
Side Chains ◽  
X Ray Diffraction ◽  
X Ray ◽  
Topochemical Polymerization ◽  
Scanning Electron

The synthesis and self-assembly of two new phenylacetylene macrocycle (PAM) organogelators were performed. Polar 2-hydroxyethoxy side chains were incorporated in the inner part of the macrocycles to modify the assembly mode in the gel state. With this modification, it was possible to increase the reactivity of the macrocycles in the xerogel state to form polydiacetylenes (PDAs), leading to a significant enhancement of the polymerization yields. The organogels and the PDAs were characterized using Raman spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM).

ChemInform Abstract: On the Symmetry of Ba3Al2O6- X-Ray Diffraction and Raman Spectroscopy Studies.

ChemInform ◽  
2009 ◽  
Vol 40 (14) ◽  
Author(s):  
B. Lazic ◽  
V. Kahlenberg ◽  
R. Kaindl ◽  
A. Kremenovic
Keyword(s):  
Raman Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectroscopy Studies

scholarly journals X-ray diffraction and Raman spectroscopy studies of high-pressure polymorphs ofL- andDL-serine

2006 ◽  
Vol 62 (a1) ◽  
pp. s255-s255
Author(s):  
E. Boldyreva ◽  
T. Drebushchak ◽  
H. Sowa ◽  
S. Goryainov ◽  
V. Chernyshev ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectroscopy Studies

Real Time X-Ray Rheology of Polymers

1994 ◽  
Vol 38 ◽  
pp. 531-537 ◽  
Author(s):  
J. A. Pople ◽  
G. R. Mitchell ◽  
C. K. Chai
Keyword(s):  
Liquid Crystalline ◽  
Structural Data ◽  
Liquid Crystalline Polymers ◽  
Polymer Processing ◽  
X Ray ◽  
Crystalline Polymers ◽  
Mechanical Measurements ◽  
Rigid Rods ◽  
Insight Into ◽  
Technological Interest

The ability to prcbe the structure of a polymer during deformation is of considerable technological interest as it lends an insight into the mechanisms involved in polymer processing. The behaviour of Liquid Crystalline Polymers (LCP's) during shear flow has generated much experimental interest by virtue of their unusual behaviour compared to that of simpler polymeric melts. The theory developed by Doi attempts to explain the observed phenomena in terms of considering interactions of rigid-rods Exact solutions to the Doi theory have been compared to experimental procedures using lyotropic LCP systems. Although much of the available data relates to mechanical measurements, the comparisons with quantitative structural data can provide useful insight.

X-ray Diffraction, Dielectric, and Raman Spectroscopy Studies of SrTiO3-Based Microwave Ceramics

2015 ◽  
Vol 45 (1) ◽  
pp. 715-721 ◽  
Author(s):  
Jingjing Qu ◽  
Fei Liu ◽  
Xing Wei ◽  
Changlai Yuan ◽  
Xinyu Liu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
X Ray Diffraction ◽  
Microwave Ceramics ◽  
X Ray ◽  
Spectroscopy Studies
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