Perspectives of Deuteron Field-Cycling NMR Relaxometry for Probing Molecular Dynamics in Soft Matter

2016 ◽  
Vol 120 (31) ◽  
pp. 7754-7766 ◽  
Author(s):  
M. Flämig ◽  
M. Becher ◽  
M. Hofmann ◽  
T. Körber ◽  
B. Kresse ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Soft Matter ◽  
Nmr Relaxometry ◽  
Field Cycling

Molecular Dynamics of Monomer, Oligomer, and Polymer Liquids in Porous Media: A Field-Cycling Nmr Relaxometry and NMR Field-Gradient Diffusometry Study

1994 ◽  
Vol 366 ◽  
Author(s):  
R. Kimmich ◽  
S. Stapf ◽  
R.-O. Seitter ◽  
P. Callaghan ◽  
E. Khozina
Keyword(s):  
Molecular Dynamics ◽  
Porous Media ◽  
Field Gradient ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Porous Matrix ◽  
Spin Lattice Relaxation ◽  
Nmr Relaxometry ◽  
Lévy Walks ◽  
Field Cycling

ABSTRACTThe molecular dynamics of fluids in porous media has been studied using field-cycling NMR relaxometry and NMR field-gradient diffusometry. The frequency dependences of the 1H and 2H spin-lattice relaxation times T1 of various liquids in porous glass reveal weak and strong adsorption behaviour depending on the polarity of the adsorbates. Correlation times eight orders of magnitude longer than in bulk have been observed. The T1 dispersion moreover reflects geometrical details of the matrix in a length scale three orders of magnitude longer than the adsorbate molecules. The mean-square displacements of adsorbate molecules on the surface are only one order of magnitude less than in bulk. The global diffusivity is reduced by tortuosity and porosity effects. The observed phenomena may be explained by bulk-mediated surface diffusion, i.e., Lévy walks. The dynamics of polymer chains much longer than the pore size is characteristicly different from that in bulk melts. There is evidence that the reptation mechanism explains at least a part of the phenomena observed for the porous matrix in contrast to findings with bulk polymer melts.

Temperature and Size-Dependence of Membrane Molecular Dynamics in Unilamellar Vesicles by Fast Field-Cycling NMR Relaxometry

2011 ◽  
Vol 115 (13) ◽  
pp. 3444-3451 ◽  
Author(s):  
Josefina Perlo ◽  
Carla J. Meledandri ◽  
Esteban Anoardo ◽  
Dermot F. Brougham
Keyword(s):  
Molecular Dynamics ◽  
Size Dependence ◽  
Unilamellar Vesicles ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Fast Field

Interpretation of Molecular Dynamics on Different Time Scales in Unilamellar Vesicles Using Field-Cycling NMR Relaxometry

2009 ◽  
Vol 113 (47) ◽  
pp. 15532-15540 ◽  
Author(s):  
Carla J. Meledandri ◽  
Josefina Perlo ◽  
Ezequiel Farrher ◽  
Dermot F. Brougham ◽  
Esteban Anoardo
Keyword(s):  
Molecular Dynamics ◽  
Time Scales ◽  
Unilamellar Vesicles ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Different Time Scales

Molecular dynamics in a blue phase liquid crystal: a 1H fast field-cycling NMR relaxometry study

Soft Matter ◽  
2013 ◽  
Vol 9 (45) ◽  
pp. 10746 ◽  
Author(s):  
Anton Gradišek ◽  
Tomaž Apih ◽  
Valentina Domenici ◽  
Vladimira Novotna ◽  
Pedro José Sebastião
Keyword(s):  
Molecular Dynamics ◽  
Liquid Crystal ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Phase Liquid ◽  
Blue Phase ◽  
Fast Field

Field-Cycling NMR Relaxometry Probing the Microscopic Dynamics in Polymer Melts

2014 ◽  
Vol 47 (22) ◽  
pp. 7917-7929 ◽  
Author(s):  
M. Hofmann ◽  
B. Kresse ◽  
A. F. Privalov ◽  
L. Willner ◽  
N. Fatkullin ◽  
...  
Keyword(s):  
Polymer Melts ◽  
Nmr Relaxometry ◽  
Field Cycling ◽  
Microscopic Dynamics
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