Orientation Polarization Spectroscopy—Toward an Atomistic Understanding of Dielectric Relaxation Processes
Reads0
Chats0
TLDR
In this article , the principal limitations of the Debye approximation are discussed and the specific IR absorption of the stretching vibration υ(OH) and the asymmetric υas(CH2) are performed in dependence on the frequency and the strength of external electric fields and at varying temperature.Abstract:
The theory of orientation polarization and dielectric relaxation was developed by P. Debye more than 100 years ago. It is based on approximating a molecule by a sphere having one or more dipole moments. By that the detailed intra- and intermolecular interactions are explicitly not taken into consideration. In this article, the principal limitations of the Debye approximation are discussed. Taking advantage of the molecular specificity of the infrared (IR) spectral range, measurements of the specific IR absorption of the stretching vibration υ(OH) (at 3370 cm−1) and the asymmetric υas(CH2) (at 2862.9 cm−1) are performed in dependence on the frequency and the strength of external electric fields and at varying temperature. The observed effects are interpreted as caused by orientation polarization of the OH and the adjacent CH2 moieties.read more
Citations
More filters
Journal ArticleDOI
New Interpretation of Glass Formation in Isomeric Substances: Shifting from Melting‐Point to Melting‐Entropy
TL;DR: In this paper , an in-depth study was performed using two more isomeric systems and the results did not constantly support the reported relationship between the melting point and glass formation among isomers, instead, molecules with enhanced glass formability are featured by the properties of low melting entropy without exception.
Journal ArticleDOI
Inter and intra molecular dynamics in Poly(trimethylene 2,5-furanoate) as revealed by infrared and Broadband Dielectric Spectroscopies
Oscar Gálvez,Óscar Toledano,Francisco Javier Hermoso,Amelia Linares,Mikel Sanz,Esther Rebollar,Aurora Nogales,Mari Cruz García-Gutiérrez,Gonzalo Santoro,Izabela Irska,Sandra Paszkiewicz,Anna Szymczyk,Tiberio A. Ezquerra +12 more
TL;DR: In this paper , the authors performed IR and dielectric spectroscopy experiments on polytrimethylene 2,5-furanoate (PTF) and poly(trimmethylene terephthalate)(PTT) below their glass transition temperatures.
Journal ArticleDOI
Understanding the difference in the stretched structural relaxations probed by dielectric and enthalpic studies of glass forming substances.
TL;DR: In this paper , the authors investigated the stretched dynamics of the structural relaxation in molecular glass formers by using dielectric and thermal relaxations, and they found βTNMH is anticorrelated with the degree of freedom, a molecule addressed by the concept of beads.
Journal ArticleDOI
Glycerol Waste to Bio-Ethanol: Optimization of Fermentation Parameters by the Taguchi Method
Chaitanya Reddy Chilakamarry,A. M. Mimi Sakinah,A. Zularism,Irshad Ahamad Khilji,Sudhakar Kumarasamy +4 more
TL;DR: In this paper , the authors used glycerol residue from the biodiesel industry as an excellent opportunity to convert ethanol by bioconversion, using the taguchi model employed optimization of fermentation parameters such as mass substrate, temperature, inoculum size, and fermentation time.
Journal ArticleDOI
Glass Transition and Related Phenomena
TL;DR: Despite recent advances in the study of complex systems, which were recognized by the Nobel Prize in Physics in 2021, glass transition and the physicochemical phenomena that occur in the supercooled liquid and glassy states have remained shrouded, at least partially, in mystery for various material groups as discussed by the authors .
References
More filters
Journal ArticleDOI
Theory of dielectric relaxation
Daniel Kivelson,Paul Madden +1 more
TL;DR: In this article, a theory of dielectric relaxation is presented which relates the frequency-dependent Dielectric constant to a truly single-particle correlation function, and the correlation function is shown to have the same form as, and to be related to, a true single particle correlation function; this relationship is proved in limited form elsewhere but generalized here.
Journal ArticleDOI
Glycerol condensed phases Part I. A molecular dynamics study
TL;DR: In this article, a model potential function was used to simulate the static and dynamical properties of glycerol in the crystal, glass and liquid phases, and the molar specific heat of the liquid and of the glass was calculated by taking into account the contributions of the conformational structure energy and the vibrational energy computed using Bose-Einstein statistics.
Journal ArticleDOI
Vibrational Stark Effects of Carbonyl Probes Applied to Reinterpret IR and Raman Data for Enzyme Inhibitors in Terms of Electric Fields at the Active Site.
TL;DR: The results demonstrate that the vibrational Stark effect provides a general framework for estimating the electrostatic contribution to the catalytic rate and may provide a metric for the design or modification of enzymes.