Complex permittivity measurements of acetone in the frequency region 50–310 GHz

Vij, J. K.; Grochulski, T.; Kocot, A.; Hufnagel, F.

doi:10.1080/00268979100100281

Cited by 20 publications

(13 citation statements)

References 18 publications

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“…Earlier works on the reorientational dynamics of acetone have been performed by NMR, [7][8][9] infrared absorption, 10 DRS, 11 and terahertz spectroscopy. 12 Among these methods, NMR and infrared spectroscopy provide information on single-molecule reorientation, while the other techniques probe the collective reorientational motion. Rotational relaxation of the liquid acetone has been studied by MD simulations, 13 which confirmed previous findings of NMR experiments.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics of liquid acetone determined by depolarized Rayleigh and low-frequency Raman scattering spectroscopy

Palombo

Paolantoni

Sassi

et al. 2011

Phys. Chem. Chem. Phys.

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Slow to ultrafast dynamics of liquid acetone at variable temperature was investigated by depolarized Rayleigh and low-frequency Raman scattering spectroscopy, in the region 0-200 cm(-1). A detailed analysis was performed on the spectra and corresponding time responses, and a consistent view of the molecular dynamics of this dipolar solvent was obtained. The effects of temperature on the spectra were interpreted, and distinct dynamical processes identified. At very low frequencies, or long time scales, acetone dynamics is characterized by a slow diffusive reorientation obeying the Stokes-Einstein-Debye hydrodynamic theory only in the limit of subslip boundary conditions. An alternative model based on the microviscosity concept proved to be able to reproduce this correlation time and its temperature dependence. A comparative analysis of collective and single-molecule reorientational times, these latter estimated from intramolecular Raman spectra, led to an orientational correlation parameter g(2) of unity, which denotes a statistical disorder of molecular polarizability tensors. A fast local restructuring process is putatively responsible for an additional contribution at subpicosecond time scales often referred to as intermediate response in other molecular liquids. The high frequency portion of the dynamical susceptibility showed the signature of librational intermolecular motions, giving rise to an ultrafast decay of the time correlation function of polarizability anisotropy. The overall approach, which provided valuable information on dynamics, structure and molecular interactions of neat acetone, will be applied to acetone electrolytic solutions.

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics of liquid acetone determined by depolarized Rayleigh and low-frequency Raman scattering spectroscopy

Palombo

Paolantoni

Sassi

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

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“…Several other liquids, such as formamide [ 75 , 84 , 134 , 137 ], DI water [ 94 , 124 , 132 ], dimethyl sulphoxide (DMSO) [ 94 , 132 , 139 ], and acetone [ 94 , 132 , 140 ], have been used as reference liquids.…”

Section: Validation and Measurement Uncertaintymentioning

confidence: 99%

“…Acetone is a polar organic solvent that has intermediate permittivity values, which have been modelled only in the upper microwave frequency range [ 140 ]. Acetone requires special handling because it has a boiling point of 56 °C and has the potential to soften some plastics [ 94 , 132 ].…”

Section: Validation and Measurement Uncertaintymentioning

confidence: 99%

Open-Ended Coaxial Probe Technique for Dielectric Measurement of Biological Tissues: Challenges and Common Practices

et al. 2018

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Electromagnetic (EM) medical technologies are rapidly expanding worldwide for both diagnostics and therapeutics. As these technologies are low-cost and minimally invasive, they have been the focus of significant research efforts in recent years. Such technologies are often based on the assumption that there is a contrast in the dielectric properties of different tissue types or that the properties of particular tissues fall within a defined range. Thus, accurate knowledge of the dielectric properties of biological tissues is fundamental to EM medical technologies. Over the past decades, numerous studies were conducted to expand the dielectric repository of biological tissues. However, dielectric data is not yet available for every tissue type and at every temperature and frequency. For this reason, dielectric measurements may be performed by researchers who are not specialists in the acquisition of tissue dielectric properties. To this end, this paper reviews the tissue dielectric measurement process performed with an open-ended coaxial probe. Given the high number of factors, including equipment- and tissue-related confounders, that can increase the measurement uncertainty or introduce errors into the tissue dielectric data, this work discusses each step of the coaxial probe measurement procedure, highlighting common practices, challenges, and techniques for controlling and compensating for confounders.

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“…4,14 Therefore, the dielectric spectra in Figure 1(a) are reliable dielectric data for benzene mono-derivatives that include frequencies up to 3 THz. Vij et al [15][16][17] systematically discussed DHO resonance modes in detail for small dipolar ketone homologues and solutions dissolved in cyclohexane.…”

Section: A Dielectric Behaviors Of No 2 -Bz/ccl 4 and No 2 -Bz/bzmentioning

confidence: 99%

“…4 Here, we propose a model to describe the c dependence of g K values based on a simple chemical reaction between two monomeric NO 2 -Bz molecules and an anti-parallel (NO 2 -Bz) 2 dimer, which is governed by an equilibrium constant (K d ), as schematically depicted in Figure 5. 4,15 The equilibrium constant (K d ), which is given by the ratio of a forward reaction rate (R f ) to a backward reaction rate (R b ), is calculated as given by eq. (5) …”

mentioning

confidence: 99%

Nitrobenzene anti-parallel dimer formation in non-polar solvents

2014

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We investigated the dielectric and depolarized Rayleigh scattering behaviors of nitrobenzene (NO2-Bz), which is a benzene mono-substituted with a planar molecular frame bearing the large electric dipole moment 4.0 D, in non-polar solvents solutions, such as tetrachloromethane and benzene, at up to 3 THz for the dielectric measurements and 8 THz for the scattering experiments at 20 °C. The dielectric relaxation strength of the system was substantially smaller than the proportionality to the concentration in a concentrated regime and showed a Kirkwood correlation factor markedly lower than unity; gK ∼ 0.65. This observation revealed that NO2-Bz has a tendency to form dimers, (NO2-Bz)2, in anti-parallel configurations for the dipole moment with increasing concentration of the two solvents. Both the dielectric and scattering data exhibited fast and slow Debye-type relaxation modes with the characteristic time constants ∼7 and ∼50 ps in a concentrated regime (∼15 and ∼30 ps in a dilute regime), respectively. The fast mode was simply attributed to the rotational motion of the (monomeric) NO2-Bz. However, the magnitude of the slow mode was proportional to the square of the concentration in the dilute regime; thus, the mode was assigned to the anti-parallel dimer, (NO2-Bz)2, dissociation process, and the slow relaxation time was attributed to the anti-parallel dimer lifetime. The concentration dependencies of both the dielectric and scattering data show that the NO2-Bz molecular processes are controlled through a chemical equilibrium between monomers and anti-parallel dimers, 2NO2-Bz ↔ (NO2-Bz)2, due to a strong dipole-dipole interaction between nitro groups.

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Complex permittivity measurements of acetone in the frequency region 50–310 GHz

Cited by 20 publications

References 18 publications

Molecular dynamics of liquid acetone determined by depolarized Rayleigh and low-frequency Raman scattering spectroscopy

Molecular dynamics of liquid acetone determined by depolarized Rayleigh and low-frequency Raman scattering spectroscopy

Open-Ended Coaxial Probe Technique for Dielectric Measurement of Biological Tissues: Challenges and Common Practices

Nitrobenzene anti-parallel dimer formation in non-polar solvents

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