scholarly journals Spectroscopic and thermal degradation studies of novel hybrid polymer based on sodium polyphosphate - polystyrene

2018 ◽  
Vol 7 (5) ◽  
pp. 337-345 ◽  
Author(s):  
Rair Driss ◽  
El Aadad Halima ◽  
Jermoumi Touria ◽  
Chahine Abdelkrim
Keyword(s):  
Raman Spectroscopy ◽  
Resonance Raman Spectroscopy ◽  
Hydrophobic Effect ◽  
Thermal Characterization ◽  
Hybrid Polymer ◽  
X Ray Diffraction ◽  
Sodium Polyphosphate ◽  
Hydrolysis Of ◽  
Phosphate Groups

We have synthesized by the hydrophobic effect a new hybrid polymer material (HP) composed of segments of different solubility: polystyrene (hydrophobic) and sodium metaphosphate (hydrophilic). The structure and thermal stability of these hybrid materials were investigated and compared to the starting materials using X-ray diffraction (XRD), 31P Nuclear Magnetic Resonance, Raman spectroscopy and thermogravimetric analysis (TGA).The structure of the hybrid material consists of a mixture of phosphate compounds resulting from the hydrolysis of NaPO3. The phosphate groups have probably formed hydrogen bonds with aromatic CH. Furthermore, the delocalization of the electrons in the aromatic group generates negative poles that can interact with the positively charged Na ion, forming a cation-Ï€ interaction.The thermal characterization of these hybrids shows a clear improvement of the thermal property. TGA results show that phosphates increase HP residues yields at 600°C. Thus, Raman spectroscopy results provide evidence for the formation of residues having an aromatic phosphocarbon and an aromatic graphitic structure.

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 Synthesis, Spectral, Structural and Thermal Characterization of Inorganic Crystal: Phenyl Trimethylammonium Tetrachlorocobaltate

2019 ◽  
Vol 31 (8) ◽  
pp. 1779-1784
Author(s):  
V. Mohanraj ◽  
R. Pavithra ◽  
M. Thenmozhi ◽  
R. Umarani
Keyword(s):  
Three Dimensional ◽  
Thermal Characterization ◽  
Dimensional Structure ◽  
X Ray Diffraction ◽  
Monoclinic Crystal ◽  
Evaporation Technique ◽  
Ft Ir ◽  
Thermal Stability Of ◽  
Ft Ir Spectroscopy

Phenyl trimethylammonium tetrachlorocobaltate, crystals were grown by slow evaporation technique. The crystal was bright, transparent. The three dimensional structure of the phenyl trimethylammonium tetrachlorocobaltate was obtained from single crystal X-ray diffraction studies. The molecule belongs to monoclinic crystal system with C2/c space group. The presence of functional groups and modes of vibrations were identified by FT-IR spectroscopy. 1H NMR spectroscopy was also used to characterise the compound and the thermal stability of the crystal was established by TGA/DT analysis. This work undergoes phase transition which makes the study interesting.

Pre-Resonance Raman Characterization of Metal-Organic Films from Titanium Alkoxide Carboxylate Complexes

1990 ◽  
Vol 180 ◽  
Author(s):  
Charles D. Gagliardi ◽  
Dilum Dunuwila ◽  
Kris A. Berglund
Keyword(s):  
Carboxylic Acid ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Titanium Isopropoxide ◽  
Organic Films ◽  
Ambient Temperatures ◽  
Metal Organic ◽  
Hydrolysis Of ◽  
Raman Characterization

ABSTRACTMetal-organic films were produced at ambient temperatures and pressures by the controlled hydrolysis of carboxylic acid and titanium isopropoxide mixtures. Pre-resonance Raman spectroscopy was used to study the effect of the organic acid chain length upon the nature of the resulting film. Propionic, butyric, valeric, hexanoic, and octanoic acids were studied, resulting in a proposed correlation between film quality and certain spectroscopic features of the alkoxide carboxylates. The choice of the carboxylic acid and the presence of an appropriate amount of water were shown to be critical in the development of a good film.

Thermal Silicidation of Ni/SiGe and Characterization of Resulting Silicide Films Using Raman Spectroscopy and X-ray Diffraction

2020 ◽  
Vol 98 (5) ◽  
pp. 457-464
Author(s):  
Woo Sik Yoo ◽  
Kitaek Kang ◽  
Toshikazu Ishigaki ◽  
Jung Gon Kim ◽  
Noriyuki Hasuike ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray

Room temperature characterization of the dioxygen intermediates of cytochrome c oxidase by resonance Raman spectroscopy

Biochemistry ◽  
1990 ◽  
Vol 29 (43) ◽  
pp. 10135-10140 ◽  
Author(s):  
Randy W. Larsen ◽  
Wei Li ◽  
Robert A. Copeland ◽  
Stephan N. Witt ◽  
Bih Show Lou ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Cytochrome C ◽  
Cytochrome C Oxidase ◽  
Room Temperature ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman
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