scholarly journals Polymer dynamics in bimodal polyethylene melts: A study with neutron spin echo spectroscopy and pulsed field gradient nuclear magnetic resonance

1999 ◽  
Vol 110 (20) ◽  
pp. 10171-10187 ◽  
Author(s):  
S. Rathgeber ◽  
L. Willner ◽  
D. Richter ◽  
A. Brulet ◽  
B. Farago ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Gradient ◽  
Spin Echo ◽  
Polymer Dynamics ◽  
Neutron Spin ◽  
Pulsed Field ◽  
Neutron Spin Echo ◽  
Polyethylene Melts ◽  
Bimodal Polyethylene

Diffusivities of n-Alkanes in 5A Zeolite Measured by Neutron Spin Echo, Pulsed-Field Gradient NMR, and Zero Length Column Techniques

Adsorption ◽  
2005 ◽  
Vol 11 (S1) ◽  
pp. 403-407 ◽  
Author(s):  
Hervé Jobic ◽  
Jörg Kärger ◽  
Cordula Krause ◽  
Stefano Brandani ◽  
A. Gunadi ◽  
...  
Keyword(s):  
Field Gradient ◽  
Spin Echo ◽  
Neutron Spin ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Neutron Spin Echo ◽  
5A Zeolite

scholarly journals Pulsed Field Gradient Nuclear Magnetic Resonance as a Probe of Liquid State Molecular Organization

1984 ◽  
Vol 37 (4) ◽  
pp. 359 ◽  
Author(s):  
PT Callaghan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Gradient ◽  
Spin Echo ◽  
Nuclear Magnetic Resonance Experiment ◽  
Molecular Organization ◽  
Pulsed Field ◽  
Pulse Separation ◽  
Magnetic Field Gradients ◽  
Nuclear Magnetic

The imposition of magnetic field gradients on a nuclear magnetic resonance experiment imparts a spatial tag to the molecules via the Larmor frequencies of the nuclei (commonly protons) within. A sensitive measure of changes in the frequency distribution is afforded by detecting the loss of phase coherence in a spin-echo experiment performed in the presence of gradient pulses. Here the molecular displacements may be measured over the duration given by the pulse separation. Pulsed field gradient nuclear magnetic resonance (PFGNMR) employs timesca1es of tens of milliseconds and has a displacement sensitivity of the order 100 nm.

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