scholarly journals Structure and conductive properties of C60 films and fullerene-containing materials deposited using aromatic and non-aromatic solvents

2019 ◽  
Vol 30 ◽  
pp. 08010
Author(s):  
Alim Seit-Ametovich Mazinov ◽  
Alexey Ivanovich Shevchenko ◽  
Andrey Sergeevich Tyutyunik ◽  
Vladimir Sergeevich Gurchenko
Keyword(s):  
Ir Spectra ◽  
Specific Conductivity ◽  
Aromatic Solvents ◽  
Conductive Properties ◽  
C60 Films

Films of fullerenes and fullerene-containing materials have been synthesized from their solutions of various volumes in aromatic and non-aromatic solvents. The photographs and the sizes of the resulting microstructures have been presented. The comparison of IR spectra has been given. Specific conductivity values have been considered.

IR spectra of CH4, CD4, C2H4, C2H2, CH3OH and CH3OD adsorbed on C60 films

1996 ◽  
Vol 92 (12) ◽  
pp. 2269 ◽  
Author(s):  
Aviva Lubezky ◽  
Ludmila Chechelnitsky ◽  
Mordechai Folman
Keyword(s):  
Ir Spectra ◽  
C60 Films

Study of Electrospun Poly\acrylonitrile (PAN) and PAN/CNT Composite Nanofibrous Webs

2015 ◽  
Vol 19 (1) ◽  
pp. 36-45 ◽  
Author(s):  
M. K. Sinha ◽  
B. R. Das ◽  
A. Srivastava ◽  
A. K. Saxena
Keyword(s):  
Mechanical Properties ◽  
Polymer Matrix ◽  
Specific Conductivity ◽  
Research Work ◽  
Fibre Diameter ◽  
Nonwoven Fabric ◽  
Coating Process ◽  
Carbon Nano Tube ◽  
Conductive Properties ◽  
Poly Acrylonitrile

The electrospinng of PAN and PAN/CNT composite webs is carried out with the commercially available Nanospider machine. The webs are spun under similar processes and coated on Polypropylene spun bonded nonwoven fabric. This research work reports on the influence of multi-walled carbon nano tube (MWCNT) on the morphology, tensile properties, conductivity, thermal, chemical and crystalline structure of PAN and PAN/CNT composite nanofibrous webs. The morphological developments are explained on the basis of nanofibre diameter and web density as depicted by FESEM images. An addition of CNT greatly affects the morphology of webs, increases fibre diameter, decreases web density and leads to a roughened web surface. The mechanical properties of PAN /CNT composite webs are also found to be influenced by CNT concentration. The addition of MWCNT to PAN enhances the conductive properties of webs. The specific conductivity of PAN/CNT composite webs is found to be in order of 10-6 S/cm, which falls in the semiconducting regime and follows Ohm's law of conductivity. The TGA plots confirmed that the PAN/CNT composite web is more thermally stable than the PAN web. The presence of CNT in the polymer matrix is evidenced by D and G band, indicating a successful electrospun coating process.

EXPRESS: Solvent Effect on Assembling and Interactions in Solutions of Phenol: Infrared Spectroscopic and DFT Study

2021 ◽  
pp. 000370282110523
Author(s):  
Yukihiro Ozaki ◽  
MirosÅ‚aw Antoni Czarnecki ◽  
Yusuke Morisawa ◽  
Swapnil Singh ◽  
Mateusz Majer
Keyword(s):  
Ir Spectra ◽  
Vibrational Spectra ◽  
Strong Interactions ◽  
Phenol Content ◽  
Oh Groups ◽  
Aromatic Solvents ◽  
The Third ◽  
Polar Groups ◽  
Low Concentrations ◽  
Insight Into

This work provides new insight into assembling and competition between different kinds of interactions for phenol in various solvents. To examine both weak and strong interactions, we selected a series of non-aromatic and aromatic solvents. IR spectra were measured at low (0.05 M) and high (2 M) phenol concentrations. In addition, we calculated (DFT) the structures and harmonic vibrational spectra of 1:1 complexes of phenol with the solvents and the associates of phenol from dimer to tetramer. Based on these results, we divided the solvents into three groups. The first group consists of non-aromatic solvents weakly interacting with phenol. Depending on the concentration, molecules of phenol in these solvents remain non-bonded or self-associated. In diluted solutions of phenol in chlorinated non-aromatic solvents do not appear free OH groups, since they are involved in a weak OH···Cl interaction. The second group consists of aromatic solvents with methyl or chlorine substituents. At low concentrations molecules of phenol are involved in the phenol-solvent OH···π interaction and the strength of these interactions depends on the solvent. At a higher phenol content exists an equilibrium between the phenol-solvent OH···π and phenol-phenol OH···OH interactions. It is of note that in diluted solutions of phenol in tetramethylethylene both the non-bonded and bonded OH coexists. Finally, the third group includes both the aromatic and non-aromatic solvents having highly polar groups like CN. In this case, regardless of the concentration all molecules of phenol are involved in the solute-solvent OH···NC interaction. Comparison of the experimental and theoretical band parameters reveals that molecules of phenol in non-aromatic solvents prefer to create the cyclic associates, while in the aromatic solvents they tend to form the linear associates.

scholarly journals SYNTHESIS, INVESTIGATION AND CONDUCTIVE PROPERTIES OF ALLUAUDITE-RELATED PHASES

2020 ◽  
pp. 6-9
Author(s):  
N. Strutynska ◽  
А. Spivak ◽  
R. Kuzmin ◽  
M. Slobodyanik
Keyword(s):  
Specific Conductivity ◽  
Complex Oxide ◽  
Structural Type ◽  
Partial Substitution ◽  
X Ray Diffraction ◽  
Monoclinic System ◽  
X Ray ◽  
Sodium Cations ◽  
Temperature Ranges ◽  
Conductive Properties

Complex oxide phosphates Na1.5Co1.5Fe1.5(PO4)3, Na1.75Co1.75Fe1.25(PO4)3, Na2Co2Fe(PO4)3 and Li0.25Na1.75Co2Fe(PO4)3, belonging to the alluaudite structural type (monoclinic system, space group C2/c) were synthesized by the melting method with further annealing of the homogenous glasses at a temperature 600°C. According to powder X-ray diffraction data the partial substitution of sodium cations by lithium cations in the initial phosphate matrix Na2Co2Fe(PO4)3 led to decreasing of lattice parameters for Li0.25Na1.75Co2Fe(PO4)3 (a = 11.7572(3) Å, b = 12.4528(4) Å, c = 6.4416(2) Å and β = 113.911(1)°). The FTIR-spectroscopy results confirmed the presence of PO4-tetrahedra in the composition of prepared phases. Modes in the regions of 400–600 cm-1 and 900–1000 cm–1 were assigned to symmetric and asymmetric stretching vibrations of phosphate tetrahedron in the alluaudite-type structure, respectively. The effect of partial substitution of sodium cations by lithium cations in the phosphate matrix Na2Co2Fe(PO4)3 as well as the decrease of sodium cations amounts in the alluauditerelated structure for the phases of Na1.5Co1.5Fe1.5(PO4)3 and Na1.75Co1.75Fe1.25(PO4)3 on the conductive properties of compounds were analyzed. It was found that increasing of sodium cations amount in the channels of the alluaudite-related structure leads to an increase of the specific conductivity from 0.011 Om-1m-1 for Na1.75Co1.75Fe1.25(PO4)3 to 0.15 Om–1m–1 for Na2Co2Fe(PO4)3 at a temperature of 550 °C. It was also found that partial substitution of sodium cations by lithium cations in the initial phosphate matrix Na2Co2Fe(PO4)3 no significant influence on conductivity of phase Li0.25Na1.75Co2Fe(PO4)3 (σ = 0.095 Оm–1m–1 at a temperature of 550 °C). In the case of phosphates Na1.75Co1.75Fe1.25(PO4)3 and Li0.25Na1.75Co2Fe(PO4)3 decreasing of conductive properties in the temperature ranges 190–250 °С and 550–590 °С, respectively are caused by contribution of different components in general conductivity. The synthesized phases can be used in the development of materials with conductive properties.

Visualization of ultrasonic cavitation in visible and IR spectra

2010 ◽  
Author(s):  
A. Osterman ◽  
O. Coutier-Delgosha ◽  
M. Hocevar ◽  
B. Sirok
Keyword(s):  
Ir Spectra ◽  
Ultrasonic Cavitation

Light- or Dark-Colored, L-DOPA-Based Melanins

2018 ◽  
Author(s):  
Koen Vercruysse ◽  
Margaret M. Whalen
Keyword(s):  
Human Physiology ◽  
Ir Spectra ◽  
Immune Cells ◽  
Chemical Properties ◽  
Chemical Signature ◽  
Ft Ir

<p>This report is a continuation of previous research on the H<sub>2</sub>O<sub>2</sub>-mediated synthesis of melanin-like pigments. We synthesized and characterized L-DOPA-based pigments using air- or H<sub>2</sub>O<sub>2</sub>-mediated<sub> </sub>oxidation. We compared their physic-chemical properties and evaluated their capacity to affect the interleukin release from immune cells. The use of higher concentrations of H<sub>2</sub>O<sub>2</sub> resulted in melanin-like materials with a distinct chemical signature in their FT-IR spectra and a lighter color. All pigments enhanced the interleukin release from immune cells. The possibility that lighter-colored melanins can be generated is discussed in the context of the importance of melanin-based pigmentation in human physiology.</p>

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