Dielectric Relaxation Studies of N-(p-Methoxybenzylidene)-p-Butylaniline and N-(p-Ethoxybenzylidene)-p-Butylaniline in Benzene at Microwave Frequencies

Arora, V. P.; Agarwal, V.K.

doi:10.1143/jpsj.42.908

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Due to the applied electric field, the dipole moment (black and green) at 293 and 315 K were delayed by around 32.5 and 18 ps, respectively. The values are close to the experimentally measured dielectric relaxation time of MBBA at 28 and 23.7 ps at 20 and 50°C, respectively [60]. In contrast, there is no oscillation of the dipole moment without the electric field at 293 K or 315 K, which indicates that the applied electric field affected the polar groups of the MBBA molecules.…”

Section: Figure 8(c)supporting

confidence: 85%

Microwave Heating of Liquid Crystals and Ethanol-Hexane Mixed Solution and Its Features (Review)

Naito¹,

Tasei²,

Mijiddorj³

et al. 2021

Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects

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Microwave heating is widely used to accelerate organic reactions in the chemistry field. However, the effect of microwaves on chemical reaction has not yet been well characterized at the molecular level. In this review chapter, microwave heating processes of liquid crystals and an ethanol-hexane mixed solution under microwave irradiation were experimentally and theoretically investigated using in situ microwave irradiation nuclear magnetic resonance (NMR) spectroscopy and molecular dynamics (MD) simulation, respectively. The temperature of the solution under microwave irradiation was estimated from a chemical shift calibrated temperature (CSC-temperature) which was determined from the temperature dependence of the 1H chemical shift. The CSC-temperatures of CH2 and CH3 non-polar protons of ethanol reflect the bulk temperature of a solution by the thermal microwave effect. The lower CSC-temperature of the OH polar protons in ethanol and much higher CSC-temperature of H-C=N (7′) and CH3-O (α’) protons of N-(4-methoxybenzyliden)-4-butylaniline with respect to the bulk temperature are attributed to the non-thermal microwave effects. According to the MD simulation under microwave irradiation, the number of hydrogen bonds increased in the ethanol-hexane mixed solution as a result of a non-thermal microwave effect. It is concluded that a coherently ordered low entropy state of polar molecules is induced by a non-thermal microwave effect. The ordered state induces molecular interaction, which may accelerate the chemical reaction rate between molecules with polar groups.

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Section: Figure 8(c)supporting

confidence: 85%

Microwave Heating of Liquid Crystals and Ethanol-Hexane Mixed Solution and Its Features (Review)

Naito¹,

Tasei²,

Mijiddorj³

et al. 2021

Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects

View full text Add to dashboard Cite

show abstract

“…Using the diffusion coefficients in Table 2 and the literature values of the second virial coefficients [6-81 for these systems Lennard-Jones potential functions were determined by a method which has been described in detail previously [9]. The collision integrals necessary for the calculations were completed by means of the program Collis [lo].…”

Section: Binary Diffusionmentioning

confidence: 99%

Diffusion coefficients and thermal diffusion factors for the systems He‐CF₄ and Ne‐CF₄

Dunlop

Robjohns

Bignell

1987

Ber Bunsenges Phys Chem

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ConclusionsNew experimental measurements of the thermal conductivity of liquid methane were obtained using a transient hot wire instrument, having an estimated accuracy better than 0.5%. It was found that the excess thermal conductivity is a function of density alone, within the limited range of thermodynamic states covered.Comparison with data of high accuracy obtained by previous authors showed an agreement well inside the mutual uncertainty.An empirical modification of the dense hard sphere theory, already used with success for liquid argon, is shown to form a reliable correlation scheme for accurate interpolation and extrapolation. Values of hard core volumes obtained from the self diffusion data by Easteal et al.[17] were slightly adjusted in the present work. We suggest that the adjusted values are to be preferred due to the higher quality of experimental data used in their determination. The corrected hard sphere theory is able to represent the data with a standard deviation better than f 0.5% and a maximum deviation of 1 YO.The model was used to predict the thermal conductivity of liquid methane along the saturation line and an equation for its variation with temperature was found to reproduce the extrapolated data to within f 0.3%. The accuracy of the proposed correlation is believed to be better than 1 YO.

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Dielectric Studies in Solid Phase EBBA

Agarwal

Arora

Mansingh

1978

Molecular Crystals and Liquid Crystals

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Dielectric measurements have been made in the stable and metastable solid phases of EBBA in the frequency range 0.1 KHz to 100 KHz and in the temperature range -170 to -10°C.The dielectric dispersion was absent in the stable phase while in the metastable phase, obtained by rapid cooling, a clear dielectric dispersion was seen. In addition to the primary dispersion extending above about -125°C there also appears a clear secondary dispersion region below -125°C. The strength of the second dispersion is lower by one order of magnitude than the primary dispersion. The primary dispersion is of the Debye type with a symmetric distribution of relaxation times. The Cole-Cole distribution parameter varies with temperature and shows a maximum at about -64°C. The results in the primary dispersion region can be qualitatively explained by assuming the free rotation of dipoles above -64°C and a restricted rotation of dipoles at low temperatures.

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Dielectric Relaxation Studies of N-(p-Methoxybenzylidene)-p-Butylaniline and N-(p-Ethoxybenzylidene)-p-Butylaniline in Benzene at Microwave Frequencies

Cited by 3 publications

References 7 publications

Microwave Heating of Liquid Crystals and Ethanol-Hexane Mixed Solution and Its Features (Review)

Microwave Heating of Liquid Crystals and Ethanol-Hexane Mixed Solution and Its Features (Review)

Diffusion coefficients and thermal diffusion factors for the systems He‐CF₄ and Ne‐CF₄

Dielectric Studies in Solid Phase EBBA

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Dielectric Relaxation Studies of N-(p-Methoxybenzylidene)-p-Butylaniline and N-(p-Ethoxybenzylidene)-p-Butylaniline in Benzene at Microwave Frequencies

Cited by 3 publications

References 7 publications

Microwave Heating of Liquid Crystals and Ethanol-Hexane Mixed Solution and Its Features (Review)

Microwave Heating of Liquid Crystals and Ethanol-Hexane Mixed Solution and Its Features (Review)

Diffusion coefficients and thermal diffusion factors for the systems He‐CF4 and Ne‐CF4

Dielectric Studies in Solid Phase EBBA

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Product

Resources

About

Diffusion coefficients and thermal diffusion factors for the systems He‐CF₄ and Ne‐CF₄