Crystallinity in PPS–carbon composites: A study using diffuse reflection FT-IR spectroscopy and differential scanning calorimetry

1990 ◽  
Vol 39 (9) ◽  
pp. 1887-1902 ◽  
Author(s):  
K. C. Cole ◽  
D. Noël ◽  
J.-J. Hechler ◽  
D. Wilson
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ir Spectroscopy ◽  
Diffuse Reflection ◽  
Carbon Composites ◽  
Scanning Calorimetry ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Mechanochemical synthesis insights and solid-state characterization of quininium aspirinate, a glass-forming drug–drug salt

2021 ◽  
Vol 77 (9) ◽  
Author(s):  
Nehemiah Harris ◽  
Jubilee Benedict ◽  
Diane A. Dickie ◽  
Silvina Pagola
Keyword(s):  
Crystal Structure ◽  
Differential Scanning Calorimetry ◽  
Ir Spectroscopy ◽  
Mechanochemical Synthesis ◽  
Mechanochemical Reaction ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Quinine (an antimalarial) and aspirin (a nonsteroidal anti-inflammatory drug) were combined into a new drug–drug salt, quininium aspirinate, C20H25N2O2 +·C9H7O4 −, by liquid-assisted grinding using stoichiometric amounts of the reactants in a 1:1 molar ratio, and water, EtOH, toluene, or heptane as additives. A tetrahydrofuran (THF) solution of the mechanochemical product prepared using EtOH as additive led to a single crystal of the same material obtained by mechanochemistry, which was used for crystal structure determination at 100 K. Powder X-ray diffraction ruled out crystallographic phase transitions in the 100–295 K interval. Neat mechanical treatment (in a mortar and pestle, or in a ball mill at 20 or 30 Hz milling frequencies) gave rise to an amorphous phase, as shown by powder X-ray diffraction; however, FT–IR spectroscopy unambiguously indicates that a mechanochemical reaction has occurred. Neat milling the reactants at 10 and 15 Hz led to incomplete reactions. Thermogravimetry and differential scanning calorimetry indicate that the amorphous and crystalline mechanochemical products form glasses/supercooled liquids before melting, and do not recrystallize upon cooling. However, the amorphous material obtained by neat grinding crystallizes upon storage into the salt reported. The mechanochemical synthesis, crystal structure analysis, Hirshfeld surfaces, powder X-ray diffraction, thermogravimetry, differential scanning calorimetry, FT–IR spectroscopy, and aqueous solubility of quininium aspirinate are herein reported.

GROWTH AND STUDIES OF PROPERTIES OF COPPER SUCCINATE DIHYDRATE SINGLE CRYSTALS

2013 ◽  
Vol 27 (11) ◽  
pp. 1350073
Author(s):  
M. P. BINITHA ◽  
P. P. PRADYUMNAN
Keyword(s):  
Differential Scanning Calorimetry ◽  
Dielectric Constant ◽  
Single Crystals ◽  
Scanning Calorimetry ◽  
Force Microscopy ◽  
Atomic Force ◽  
Different Temperatures ◽  
Triclinic Structure ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Single crystals of copper succinate dihydrate (CSD) with triclinic structure were grown in silica gel medium. The functional groups in the crystal were analyzed by FT-IR Spectroscopy. Atomic Force Microscopy (AFM) revealed the striations on the surface of grown crystals, which were incorporated during its time of growth. Thermal degradation studies have been carried out by Differential Scanning Calorimetry (DSC). Dielectric constant and AC conductivity have been estimated as a function of frequency at different temperatures.

New Dilution Materials for Sensitivity Enhancement in the FT-IR Spectroscopy of Pitches as Typical Highly Scattering Samples

1989 ◽  
Vol 43 (3) ◽  
pp. 477-480 ◽  
Author(s):  
Mikio Kaihara ◽  
Hiroaki Mametsuka ◽  
Naoki Gunji ◽  
Hideo Iwata ◽  
Yohichi Gohshi
Keyword(s):  
Ir Spectroscopy ◽  
Diffuse Reflection ◽  
Sensitivity Enhancement ◽  
Chemical Components ◽  
Reflection Method ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Because they are composed of a variety of chemical components, pitches are possessed of highly scattering properties. Therefore, the spectra of pitches obtained by FT-IR have large backgrounds, and the backgrounds have a detrimental influence on the accuracy of analysis. Recently, the diffuse reflection method has been widely used for analyzing pitches, although it has been pointed out that the method has some problems; for example, diffuse reflection cannot obtain very sharp absorption peaks. In this paper, new dilution materials are developed and proposed that allow one to obtain fine spectra of pitches. With the use of our dilution materials, the shapes of absorption peaks become more sharp, the intensities of the peaks increase considerably, and the backgrounds of those spectra are reduced to a large extent. The quality of the spectra of the pitches is considerably improved. Our method may prove to be a solution for dealing with the problem posed by backgrounds, which have heretofore seriously affected accuracy in the analysis of spectra.

Synthesis and Characterization of Triethanolamine Borate

2013 ◽  
Vol 709 ◽  
pp. 28-31
Author(s):  
Cheng Xue Wang ◽  
Tian Tian Liang ◽  
Chun Qiao Wei
Keyword(s):  
Mass Spectrometry ◽  
Differential Scanning Calorimetry ◽  
Synthesis And Characterization ◽  
Spectroscopy Analysis ◽  
Scanning Calorimetry ◽  
Reaction Conditions ◽  
Different Types ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Starting with boric acid and triethanolamine , the effect of the different types of the water-carrying agent on the yield was invested, and influences of dosage of water-carrying agent ,the mole ratio of reactants, reaction time on yield were discussed, the optimized reaction conditions were confirmed. The structure of the product was described by Fourier transform-infrared (FT-IR) spectroscopy, NMR Spectroscopy analysis, mass spectrometry (MS) and thermodynamic properties was analyzed by differential scanning calorimetry (DSC) and thermogravimetry (TG).

scholarly journals Swelling Behaviour of Starch-g-Acrylic Acid Hydrogel and its Potential Application in Removal of Rhodamine B and Alkali Blue Dyes

2021 ◽  
Vol 18 (2) ◽  
pp. 98-104
Author(s):  
S. Yahaya ◽  
Z.I.S.G. Adiya ◽  
S. S. Adamu ◽  
H.B. Bature ◽  
I.B. Ibrahim
Keyword(s):  
Ir Spectroscopy ◽  
Acrylic Acid ◽  
Rhodamine B ◽  
Dye Adsorption ◽  
Batch Adsorption ◽  
Scanning Calorimetry ◽  
Adsorption Method ◽  
Ft Ir ◽  
Percentage Removal ◽  
Ft Ir Spectroscopy

Starch-g-acrylic acid hydrogel was prepared by free radical polymerization technique adopting potassium persulphate (KPS) as an initiator and N’N-methylenebisacrylamide (MBA) as a linking agent. The aim of the research is to inspect the potentials of starch-based hydrogel in remediating wastewater. Fourier Transform Infrared (FT-IR) spectroscopy was used to find the formation of hydrogel while Differential Scanning Calorimetry (DSC) and Scanning Electron Microscopy (SEM) were used for the characterization of the hydrogel. The FT-IR spectroscopy confirmed hydrogel formation. The DSC results showed that the generated hydrogel is thermally stable, and the SEM depicts a good porous site for dye adsorption. Batch adsorption for Rhodamine B (RDB) and Alkali blue (AB) dyes under the variation of contact time was 105 minutes for both dyes with percentage removal of 89.80 and 60.32%, adsorbent dose was 0.4 and 0.8 g with percentage removal of 86.42 and 57.95%, concentration was 50 and 30 ppm with percentage removal of 67.01 and 77.18% and pH was 8 for both dyes with percentage removal of 77.43 and 79.13% as the optimum. The results indicates that acrylic acid monomer was efficiently grafted on the starch, and the adsorption method correlated with Freundlich isotherm equation. It was concluded that the starch-based hydrogel is an appropriate adsorbent and can be explored for industrial wastewater treatment.

scholarly journals Star-Shaped Polydimethylsiloxanes with Organocyclotetrasilsesquioxane Branching-Out Centers: Synthesis and Properties

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 285
Author(s):  
Yulia S. Dyuzhikova ◽  
Anton A. Anisimov ◽  
Alexander S. Peregudov ◽  
Mikhail I. Buzin ◽  
Galina G. Nikiforova ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Gel Permeation Chromatography ◽  
Physicochemical Analysis ◽  
Langmuir Trough ◽  
Scanning Calorimetry ◽  
Gel Permeation ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

New non-crystallizable low-dispersity star-shaped polydimethylsiloxanes (PDMS) containing stereoregular cis-tetra(organo)(dimethylsiloxy)cyclotetrasiloxanes containing methyl-, tolyl- and phenyl-substituents at silicon atoms and the mixture of four stereoisomers of tetra[phenyl(dimethylsiloxy)]cyclotetrasiloxane as the cores were synthesized. Their thermal and viscous properties were studied. All synthesized compounds were characterized by a complex of physicochemical analysis methods: nuclear magnetic resonance (NMR), FT-IR spectroscopy, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), viscometry in solution, rheometry, and Langmuir trough study.

scholarly journals Induced Smectic Phases from Supramolecular H-Bonded Complexes Based on Non-Mesomorphic Components

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 940
Author(s):  
Fowzia S. Alamro ◽  
Hoda A. Ahmed ◽  
Magdi M. Naoum ◽  
Ayman M. Mostafa ◽  
Asmaa A. Alserehi
Keyword(s):  
Fatty Acids ◽  
Differential Scanning Calorimetry ◽  
Scanning Calorimetry ◽  
Acid Component ◽  
Smectic Phases ◽  
Ft Ir ◽  
The Stability ◽  
Oleic And Linoleic Acids ◽  
Ft Ir Spectroscopy ◽  
Induced Smectic Phases

New non-symmetrical 1:1 supramolecular H-bonded (SMHB) interactions, Ix/II, were designed between the non-mesomorphic fatty acids (palmitic, oleic and linoleic acids) and 4-tetradecyloxyphenylazo pyridine. Mesophase behaviors of the formed complexes were examined via differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). In order to confirm the H-bond interaction formations within the prepared SMHB complexes, FT-IR spectroscopy was established whereby Fermi bands confirm these interactions. Mesomorphic investigations for all complexes indicated that, independent of the terminal alkenyl chains of the natural acids, induced dimorphic smectic phases were observed. The stability of formed mesophases was found to depend on the degree of un-saturation of the terminal alkenyl group of acid component.

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