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 of Chitosan Films

2013 ◽  
Vol 685 ◽  
pp. 336-339 ◽  
Author(s):  
E.I. Bobritskaya ◽  
R.A. Castro ◽  
Yu.A. Gorokhovatsky ◽  
D.E. Temnov
Keyword(s):  
Acetic Acid ◽  
Dielectric Relaxation ◽  
Bound Water ◽  
Relaxation Processes ◽  
Dielectric Spectra ◽  
Chitosan Films ◽  
Second Peak

Dielectric spectra of pure chitosan films and chitosan films with different fillers were obtained. Two relaxation processes in 200 – 500 K temperature intervals were observed: wide β - peak in the region of 290 K and  - peak in the region of 390 K. The first peak due to the presence of the polymer-bound water and/or acetic acid and disappears when filler injected into the polymer. The second peak may be associated with the activation of the nonohmic conductivity.

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.

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