Dielectric relaxation and proton field-cycling NMR relaxometry study of dimethyl sulfoxide/glycerol mixtures down to glass-forming temperatures

Flämig, M.; Gabrielyan, Lilit; Minikejew, Rafael; Markarian, Shiraz A.; Rössler, E. A.

doi:10.1039/d0cp00501k

Cited by 9 publications

(3 citation statements)

References 67 publications

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“…However, ε′ slightly decreases with increasing temperature. This behavior with temperature is expected from Curie's law [67]. The abrupt increase of ε′ at lower frequencies could be due to a superposition of electrode effect and the charge carriers' transport.…”

Section: Dielectric Properties Of Pyrrole (Py) and (3ht) Monomerssupporting

confidence: 65%

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

Mohamed,

Rehim,

Hameed

et al. 2023

Phys. Scr.

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In the present work polypyrrole (PPy) and poly (3-hexylthiophene) (P3HT) are prepared via oxidation polymerization, their optical and dielectric properties in comparison with their originating monomers are investigated. The chemical structure of both polymers is confirmed by FTIR spectroscopy. Investigation of optical properties of the prepared polymers showed that the band gap of PPY is 1.25 eV, whereas that of P3HT is 1.79 eV. In addition, P3HT showed a refractive index of high values in the visible region compared to PPy. Dielectric relaxation of both monomers and polymers was studied in the frequency range of 10-1  /Hz <107 for comparison. Furthermore, temperature dependencies of their electrical properties are investigated. The DC conductivity values of PPy and P3HT are found to be 2× 10-7 S/cm and 2× 10-4 S/cm, at T = 313 K, respectively, which is the ranges of semiconductors and conductors reflecting the remarkable enhancement of conductivity according to polymerization process. The temperature dependence of the DC conductivity for the monomers and polymers follows Vogel−Fulcher−Tammann (VFT) equation. The parameters of the frequency-dependent provide basic information for adjustment of the structural properties of the conjugated polymers and finding the theoretical limits controlling the charge transport

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Section: Dielectric Properties Of Pyrrole (Py) and (3ht) Monomerssupporting

confidence: 65%

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

Mohamed,

Rehim,

Hameed

et al. 2023

Phys. Scr.

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“…In the rare case that both components show the same diffusion ( D 1 ≅ D 2 ), one gets D 12 = 2 D 1 = 2 D 2 , or for the case D 2 < < D 1 , one probes D 1 only. The situation D 1 ≅ D 2 may indeed be observed in associating liquids such as glycerol mixed with dimethyl sulfoxide, for example, or in some ionic liquids …”

Section: Applicationsmentioning

confidence: 92%

Application of proton field‐cyclingNMRrelaxometry for studying translational diffusion in simple liquids and polymer melts

Flämig

Hofmann

Lichtinger

et al. 2019

Magnetic Reson in Chemistry

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“…The inset shows D T τ R values for o -terphenyl, EG, and glycerol. Our simulation results are compared with experimental data from our FC study on EG-h 4 and from the literature for o -terphenyl and glycerol-h 5 …”

mentioning

confidence: 99%

A Relation between the Formation of a Hydrogen-Bond Network and a Time-Scale Separation of Translation and Rotation in Molecular Liquids

Becher

Horstmann

Kloth

et al. 2022

J. Phys. Chem. Lett.

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We study the relation between the translational and rotational motions of liquids, which is anticipated in the framework of the Stokes−Einstein−Debye (SED) treatment. For this purpose, we exploit the fact that 1 H field-cycling nuclear magnetic resonance relaxometry and molecular dynamics simulations provide access to both modes of motion. The experimental and computational findings are fully consistent and show that the time-scale separation between translation and rotation increases from the van der Waals liquid o-terphenyl over ethylene glycol to the hydrogen-bonded liquid glycerol, indicating an increasing degree of breakdown of the SED relation. Furthermore, the simulation results for two ethylene glycol models with different molecular conformations indicate that the translation is more retarded than the rotation when the density of intermolecular hydrogen bonds increases. We conclude that an increasing connectivity of a hydrogen-bond network leads to an increasing time-scale separation and, thus, to a stronger SED violation.

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Dielectric relaxation and proton field-cycling NMR relaxometry study of dimethyl sulfoxide/glycerol mixtures down to glass-forming temperatures

Abstract: Mixtures of glycerol and dimethyl sulfoxide (DMSO) are studied by dielectric spectroscopy (DS) and by 1H field-cycling (FC) NMR relaxometry in the entire concentration range and down to glass-forming temperatures (170–323 K).

Cited by 9 publications

References 67 publications

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

Optical properties and dielectric relaxation of polypyrrole and poly (3-hexylthiophene)

Application of proton field‐cyclingNMRrelaxometry for studying translational diffusion in simple liquids and polymer melts

A Relation between the Formation of a Hydrogen-Bond Network and a Time-Scale Separation of Translation and Rotation in Molecular Liquids

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