The clathrate hydrate of 2-methylpropanal: dielectric evidence

1978 ◽  
Vol 56 (15) ◽  
pp. 2025-2028 ◽  
Author(s):  
S. R. Gough
Keyword(s):  
Activation Energy ◽  
Dielectric Relaxation ◽  
Clathrate Hydrate ◽  
Host Interactions ◽  
Guest Species ◽  
Structure Ii Clathrate Hydrate

Dielectric relaxation evidence is presented of the encageability of 2-methylpropanal in the structure II clathrate hydrate lattice. The hydrate composition is inferred to be (CH3)2CHCHO 17H2O and, for the 2-methylpropanal/THF mixed hydrate studied in detail, the activation energy for aldehyde reorientation is shown to be 2.0 kcal/mol. The results suggest that the guest–host interactions may be somewhat different for the two guest species.

Dielectric evidence for the formation of a clathrate hydrate by sulfuryl chloride

1983 ◽  
Vol 61 (9) ◽  
pp. 2053-2054 ◽  
Author(s):  
S. R. Gough ◽  
J. A. Ripmeester ◽  
D. W. Davidson
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Clathrate Hydrate ◽  
Sulfuryl Chloride ◽  
Dielectric Absorption ◽  
Structure Ii Clathrate Hydrate

A hydrate formed by SO2Cl2 at −20 °C is shown by its low temperature dielectric absorption to be a structure II clathrate hydrate. The activation energy for reorientation of encaged SO2Cl2 molecules is 1.1 kcal mol−1 between 19 and 41 K.

Dielectric Relaxation Studies of Silver Nanoparticles dispersed Liquid Crystal

2015 ◽  
Vol 8 (3) ◽  
pp. 2176-2188 ◽  
Author(s):  
Keisham Nanao Singh
Keyword(s):  
Activation Energy ◽  
Silver Nanoparticles ◽  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Process ◽  
Relaxation Times ◽  
Low Frequency ◽  
Bulk Liquid ◽  
Molecular Rearrangement ◽  
Relaxation Studies

This article reports on the Dielectric Relaxation Studies of two Liquid Crystalline compounds - 7O.4 and 7O.6 - doped with dodecanethiol capped Silver Nanoparticles. The liquid crystal molecules are aligned homeotropically using CTAB. The low frequency relaxation process occurring above 1 MHz is fitted to Cole-Cole formula using the software Dielectric Spectra fit. The effect of the Silver Nanoparticles on the molecular dipole dynamics are discussed in terms of the fitted relaxation times, Cole-Cole distribution parameter and activation energy. The study indicate a local molecular rearrangement of the liquid crystal molecules without affecting the order of the bulk liquid crystal molecules but these local molecules surrounding the Silver Nanoparticles do not contribute to the relaxation process in the studied frequency range. The observed effect on activation energy suggests a change in interaction between the nanoparticles/liquid crystal molecules.

Ultrasonic wave velocities in the structure II clathrate hydrate THF�17H2O

1984 ◽  
Vol 3 (10) ◽  
pp. 904-906 ◽  
Author(s):  
M. Bathe ◽  
S. Vagle ◽  
G. A. Saunders ◽  
E. F. Lambson
Keyword(s):  
Ultrasonic Wave ◽  
Clathrate Hydrate ◽  
Wave Velocities ◽  
Structure Ii Clathrate Hydrate

scholarly journals Dielectric and Conduction Processes and Behaviours in Ni0.3Zn0.7Fe2O4

2016 ◽  
Vol 846 ◽  
pp. 311-317
Author(s):  
Mohd Noor Mat ◽  
M.K. Halimah ◽  
Wan Mohd Daud Wan Yusoff ◽  
H. Mansor ◽  
H. Nizam ◽  
...  
Keyword(s):  
Activation Energy ◽  
Zinc Oxide ◽  
Iron Oxide ◽  
Dielectric Properties ◽  
Dielectric Relaxation ◽  
Relaxation Process ◽  
Peak Frequency ◽  
Frequency Range ◽  
Dielectric Relaxation Process ◽  
Frequency Relaxation

Dielectric relaxation and conductivity of Ni0.3Zn0.7Fe2O4 (NZF) were studied in the frequency range between 0.01 Hz to 3 MHz and temperature range within 313 K to 473 K. The sample was prepared by mixing Zinc Oxide, Nickel Oxide and Iron Oxide and sintered at 1573 K for 10 hours long. Dielectric properties were studied using Novo Control Dielectric Spectrometer. Dielectric relaxation and conductivity phenomena were discussed using an empirical model to key out the dielectric relaxation process. Analyze peak frequency relaxation process consist of four slopes to explain the dielectric relaxation process. The conductivity of the sample indicates an activated process and activation energy of dc conductivity is 0.44 ± 0.01 eV.

Dielectric and nuclear magnetic resonance properties of a clathrate hydrate of cyclopropane

1969 ◽  
Vol 47 (24) ◽  
pp. 4697-4699 ◽  
Author(s):  
Y. A. Majid ◽  
S. K. Garg ◽  
D. W. Davidson
Keyword(s):  
Phase Diagram ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Dielectric Relaxation ◽  
Proton Magnetic Resonance ◽  
Clathrate Hydrate ◽  
Vapor Pressures ◽  
Relaxation Data ◽  
Resonance Properties ◽  
Recent Phase

Dielectric relaxation data and proton magnetic resonance spectra are given for the structure I clathrate hydrate of cyclopropane. Vapor pressures have been measured along the structure I – structure II – gas equilibrium line missing from the recent phase diagram of Hafemann and Miller.

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