Anisotropic self-diffusion in the nematic phase of a thermotropic liquid crystal by 1H-spin-echo nuclear magnetic resonance

2001 ◽  
Vol 115 (4) ◽  
pp. 1946-1950 ◽  
Author(s):  
S. V. Dvinskikh ◽  
I. Furó
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Liquid Crystal ◽  
Magnetic Resonance ◽  
Nematic Phase ◽  
Spin Echo ◽  
Self Diffusion ◽  
Thermotropic Liquid Crystal ◽  
Nuclear Magnetic

129Xe and 2H nuclear magnetic resonance (NMR) of xenon and deuterated-chloroform solutes in a thermotropic biaxial nematic liquid crystal

2011 ◽  
Vol 89 (9) ◽  
pp. 1143-1149 ◽  
Author(s):  
P. Tallavaara ◽  
A.M. Kantola ◽  
J. Jokisaari ◽  
T. Meyer ◽  
D.A. Wilson ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Liquid Crystal ◽  
Magnetic Resonance ◽  
Nematic Liquid Crystal ◽  
Nematic Phase ◽  
Deuterated Chloroform ◽  
H Nmr ◽  
Clear Change ◽  
Biaxial Nematic ◽  
Nuclear Magnetic

Properties of a thermotropic nematic liquid crystal (LC) TM35 (organosiloxane tetrapode) were investigated by means of nuclear magnetic resonance (NMR) spectroscopy of probe atoms and molecules. 129Xe isotope enriched xenon gas and 2H isotope enriched chloroform were used as probes. Both 129Xe and 2H NMR measurements were carried out over a wide temperature range, covering isotropic, nematic, and glass phases. A clear change in the behavior of the LC is observed within the nematic phase at 289 K by changing the temperature from low to high and inspecting the spectral line width. The derivative curve of the 129Xe chemical shift also reveals a change at 289 K. These changes may be an indication of hindered molecular rotation around the long axis, and the appearance of a biaxial nematic phase.

Diffusionskonstanten einiger organischer Flüssigkeiten

1970 ◽  
Vol 25 (5) ◽  
pp. 777-780 ◽  
Author(s):  
Gottfried J. Krüger ◽  
Rene Weiss
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Acetic Acid ◽  
Magnetic Resonance ◽  
Diffusion Coefficients ◽  
Spin Echo ◽  
The Self ◽  
Self Diffusion ◽  
Resonance Spin ◽  
Nuclear Magnetic

The self diffusion coefficients of acetone, ethanol, diethoxymethane, diethylether, diglycole-dimethylether, 1,2-dimethoxyethane, acetic acid, methyliodide, tetrahydrofuran, toluene, trimethylphosphite, and 1,3,5-trifluorobenzene have been measured in dependence on temperature using nuclear magnetic resonance spin echo techniques.

Sign in / Sign up

Export Citation Format

Share Document