Microwave dielectric spectra and molecular interaction in a binary mixture of ethanolamine with diethanolamine

Patil, A.V.; Pawar, V.P.

doi:10.1016/j.molliq.2013.09.007

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…The isothermal dielectric loss spectra ε″( f ) acquired upon heating from the metastable crystal phase are shown in Figure a, where we have merged the low-frequency loss data (a different representation of the data shown in Figure a, see Section ) with the high frequency data measured in an independent experiment. The high-frequency spectra at high temperature are measured on liquid EAM and display a relaxation peak in the microwave frequency region (between 10 8 and 10 9 Hz), commonly referred to as “structural relaxation”, whose position is in rough agreement with previous studies. , This relaxation could be well described by a Cole–Cole function (eq ) with an exponent c only slightly lower than unity.…”

Section: Results and Discussionsupporting

confidence: 83%

“…In many hydrogen-bonded liquids and supercooled liquids, such as water, monoalcohols, amines, and peptides, − but also liquid EAM, the most intense dielectric loss feature has a symmetric and relatively narrow frequency profile, usually modeled with a Debye or Cole–Cole function (eq ) and termed “Debye-like” relaxation, which is assigned to a cooperative dynamics of the hydrogen-bond network dynamics accompanied by the reorientation of the constituent molecules. The isothermal dielectric loss spectra ε″( f ) acquired upon heating from the metastable crystal phase are shown in Figure a, where we have merged the low-frequency loss data (a different representation of the data shown in Figure a, see Section ) with the high frequency data measured in an independent experiment.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This makes it unlikely that the charge transport in solid EAM involves the Grotthus proton shuttling typical of water and hydrated samples; 13,14,44,45 the ionic conductivity of EAM should be rather ascribed to diffusion of ionic species. In many H-bonded liquids and supercooled liquids, such as water, monoalcohols, amines and peptides, [46][47][48][49][50][51][52][53][54] but also liquid EAM, 55 the most intense dielectric loss feature has a symmetric and relatively narrow frequency profile, usually modeled with a Debye or Cole-Cole function (Eq. 1) and termed "Debye-like" relaxation, which is assigned to a cooperative dynamics of the H-bond network dynamics accompanied by the reorientation of the constituent molecules.…”

Section: Phase Transitions In Eam and Analysis Of The Metastable And mentioning

confidence: 99%

“…The high-frequency spectra at high temperature are measured on liquid EAM, and display a relaxation peak in the microwave frequency region (between 10 8 and 10 9 Hz), commonly referred to as "structural relaxation", whose position is in rough agreement with previous studies. 55,56 This relaxation could be well described by a Cole-Cole function (Eq. 1) with an exponent c only slightly lower than unity.…”

Section: Phase Transitions In Eam and Analysis Of The Metastable And mentioning

confidence: 99%

See 3 more Smart Citations

Polymorphism with Conformational Isomerism and Incomplete Crystallization in Solid Ethanolamine

Romanini

Négrier

Tripathi

et al. 2019

Crystal Growth & Design

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We employ calorimetry, Rietveld refinement of X-ray powder diffraction, broadband dielectric spectroscopy and molecular dynamics simulations, to investigate the phase behavior, crystal structure, dc conductivity and dielectric response of the condensed phases of ethanolamine (EAM), an ethane derivative with two distinct hydrogen-bonding groups. EAM is found to exhibit, besides its stable crystal phase, a metastable crystalline phase obtained from the supercooled liquid phase. The metastable phase can only be maintained at low temperature; upon heating an irreversible exothermic transformation to the stable crystal structure takes place at 210 K, with a low transition enthalpy of ca. 2.4 J/g. The observed polymorphism is accompanied by differences in the molecular conformation and degree of structural order. Each EAM molecule participates in six H-bonds in both crystalline phases. While the stable phase is fully ordered, the metastable phase appears to be characterized by a statistical disorder in the position of the hydrogen atoms and thus of the intramolecular conformation and intermolecular hydrogen bonding. Our molecular dynamics simulations suggest that such disorder is dynamic in character, and allow analyzing the dynamic H-bonding motif of the metastable phase in terms of composition, length and energy of the H-bonds, and molecular conformations involved. Charge conduction is mainly ionic in both crystalline phases and exhibits the typical temperature dependence of disordered solid electrolytes, rather than crystalline ones. Dielectric characterization indicates that, upon crystallization of liquid EAM, a small fraction of the sample (approximately 5%) remains amorphous, a situation similar to that reported for other H-bonded systems such as glycerol and nbutanol.

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Section: Results and Discussionsupporting

confidence: 83%

Section: Results and Discussionmentioning

confidence: 99%

Section: Phase Transitions In Eam and Analysis Of The Metastable And mentioning

confidence: 99%

Section: Phase Transitions In Eam and Analysis Of The Metastable And mentioning

confidence: 99%

See 2 more Smart Citations

Polymorphism with Conformational Isomerism and Incomplete Crystallization in Solid Ethanolamine

Romanini

Négrier

Tripathi

et al. 2019

Crystal Growth & Design

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“…The study of dielectric properties gives information about solute-solvent interaction and also formation of monomers and multimers. [1][2][3] Interaction of the electromagnetic radiation with the dielectric material gives a complex quantity, the real part of which represents the dielectric dispersion (" 0 ) or static dielectric and the imaginary part indicates the dielectric loss (" 00 ).…”

Section: Introductionmentioning

confidence: 99%

Complex permittivity spectra of binary polar liquids using time domain reflectometry

Tabassum¹,

Pawar²

2018

J. Adv. Dielect.

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The study of complex properties in a binary mixture of polar liquids has been carried out in the frequency range of 10[Formula: see text]MHz to 30 GHz at 293[Formula: see text]K and 298[Formula: see text]K temperatures using time domain reflectometry. The complex properties of polar liquids in binary mixture give information about the frequency dispersion in the dielectric permittivity ([Formula: see text]) and dielectric loss ([Formula: see text]). The information regarding the orientation of electric dipoles in a polar liquid mixture is given by Kirkwood parameters. The Bruggeman parameters are used as the indicator of liquid1 and liquid2 interaction. Molar entropy ([Formula: see text]) and molar enthalpy ([Formula: see text]) are also discussed at the end of the paper.

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Static dielectric constant of 2-aminoethanol

Wohlfarth¹

2015

Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures

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Microwave dielectric spectra and molecular interaction in a binary mixture of ethanolamine with diethanolamine

Cited by 15 publications

References 21 publications

Polymorphism with Conformational Isomerism and Incomplete Crystallization in Solid Ethanolamine

Polymorphism with Conformational Isomerism and Incomplete Crystallization in Solid Ethanolamine

Complex permittivity spectra of binary polar liquids using time domain reflectometry

Static dielectric constant of 2-aminoethanol

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