Relationship between the primary and secondary dielectric relaxation processes in propylene glycol and its oligomers

1999 ◽  
Vol 110 (23) ◽  
pp. 11585-11591 ◽  
Author(s):  
C. León ◽  
K. L. Ngai ◽  
C. M. Roland
Keyword(s):  
Dielectric Relaxation ◽  
Propylene Glycol ◽  
Relaxation Processes

Relaxation processes of some simple aliphatic molecules in dilute solutions

1977 ◽  
Vol 55 (4) ◽  
pp. 297-301 ◽  
Author(s):  
M. P. Madan
Keyword(s):  
Carbon Tetrachloride ◽  
Dielectric Relaxation ◽  
Thermodynamic Parameters ◽  
Relaxation Times ◽  
Relaxation Processes ◽  
Dilute Solutions ◽  
Microwave Region ◽  
Nonpolar Solvents ◽  
Dielectric Data ◽  
Intramolecular Rotation

The dielectric relaxation processes of acetone, cyclohexanone, 4-methyl-2-pentanone, and 4-heptanone in dilute nonpolar solvents, n-heptane, cyclohexane, benzene, and carbon tetrachloride have been studied in the microwave region over a temperature range 10 to 60 °C. The relaxation times and the thermodynamic parameters for the activated states have been determined using the measured dielectric data. The results have been discussed in terms of dipole reorientation by molecular and intramolecular rotation and compared, wherever possible, with other similar studies on aliphatic molecules.

scholarly journals Segmental- and normal-mode dielectric relaxation of poly(propylene glycol) under pressure

2003 ◽  
Vol 41 (23) ◽  
pp. 3047-3052 ◽  
Author(s):  
C. M. Roland ◽  
T. Psurek ◽  
S. Pawlus ◽  
M. Paluch
Keyword(s):  
Dielectric Relaxation ◽  
Propylene Glycol ◽  
Normal Mode ◽  
Poly Propylene

EFFECT OF CELL THICKNESS ON THE DIELECTRIC RELAXATION PROCESSES IN FERROELECTRIC LIQUID CRYSTALS

2008 ◽  
Vol 22 (14) ◽  
pp. 2263-2273 ◽  
Author(s):  
RAJBIR SINGH ◽  
K. K. RAINA
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Dielectric Strength ◽  
Relaxation Processes ◽  
Goldstone Mode ◽  
Ferroelectric Liquid Crystal ◽  
Dielectric Relaxation Spectroscopy ◽  
Dielectric Parameters ◽  
Liquid Crystal Material ◽  
Cell Thickness

Dielectric relaxation spectroscopy in the frequency range 50 Hz to 1 MHz has been carried out in a room temperature ferroelectric liquid crystal mixture in the SmC*, SmA and N* phases in cells of different thickness. The relaxation frequency fr, distribution parameter α and dielectric strength δ∊ have been evaluated. Goldstone mode, domain mode and soft mode have been observed. It is found that the cell thickness has a significant effect on the dielectric parameters of the ferroelectric liquid crystal material. The results have been discussed.

On the temperature and pressure dependence of dielectric relaxation processes in ionic liquids

2021 ◽  
Author(s):  
Florian Pabst ◽  
Zaneta Wojnarowska ◽  
Marian Paluch ◽  
Thomas Blochowicz
Keyword(s):  
Ionic Liquids ◽  
Dielectric Relaxation ◽  
Pressure Dependence ◽  
Dynamic Processes ◽  
Relaxation Processes ◽  
Dielectric Spectra ◽  
Temperature And Pressure ◽  
Microscopic Origin

The temperature and pressure dependence of two dynamic processes in the dielectric spectra of five supercooled ionic liquids equipped with octyl-chains are reported. The microscopic origin of these processes is discussed.

Dielectric Relaxation in Glycerol, Propylene Glycol, andn‐Propanol

1951 ◽  
Vol 19 (12) ◽  
pp. 1484-1490 ◽  
Author(s):  
D. W. Davidson ◽  
R. H. Cole
Keyword(s):  
Dielectric Relaxation ◽  
Propylene Glycol

Modeling of Dielectric Relaxation Processes in Moist Sand Rocks

2017 ◽  
Vol 60 (4) ◽  
pp. 711-716 ◽  
Author(s):  
P. P. Bobrov ◽  
V. N. Krasnoukhova ◽  
E. S. Kroshka ◽  
A. S. Lapina
Keyword(s):  
Dielectric Relaxation ◽  
Relaxation Processes ◽  
Moist Sand
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