MAS PFG NMR Studies of Mixtures in Porous Materials

This minireview focuses on diffusion NMR studies in bicelles. Following a discourse on diffusion fundamentals, and a comparative overview of fluorescence and NMR-based techniques for measuring diffusion, the pulsed field gradient (PFG) NMR diffusion method is introduced, emphasizing its specific advantages and limitations when applied to diffusion measurements in macroscopically oriented lamellar systems such as magnetically aligned bicelles. The utility of PFG NMR diffusion measurements in bicellar model membrane systems for examining lateral diffusion of membrane-bound molecular species is demonstrated, along with certain features of lateral diffusion that such studies illuminate. Further, those aspects of bicelle morphology that have been resolved using PFG NMR diffusion studies of various molecular weight soluble polymeric species are reviewed. The discussion concludes with an outline of future prospects for diffusion NMR studies in bicelles.

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Bicellar Mixtures Containing Pluronic F68: Morphology and Lateral Diffusion from Combined SANS and PFG NMR Studies

Langmuir ◽

10.1021/la902795h ◽

2010 ◽

Vol 26 (4) ◽

pp. 2630-2638 ◽

Cited By ~ 17

Author(s):

Ronald Soong ◽

Mu-Ping Nieh ◽

Eric Nicholson ◽

John Katsaras ◽

Peter M. Macdonald

Keyword(s):

Lateral Diffusion ◽

Nmr Studies ◽

Pluronic F68 ◽

Pfg Nmr

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1H NMR Relaxometry, Viscometry, and PFG NMR Studies of Magnetic and Nonmagnetic Ionic Liquids

The Journal of Physical Chemistry B ◽

10.1021/jp4078536 ◽

2013 ◽

Vol 117 (39) ◽

pp. 11877-11884 ◽

Cited By ~ 19

Author(s):

Carla I. Daniel ◽

Fabián Vaca Chávez ◽

Gabriel Feio ◽

Carla A. M. Portugal ◽

João G. Crespo ◽

...

Keyword(s):

Ionic Liquids ◽

1H Nmr ◽

Nmr Studies ◽

Nmr Relaxometry ◽

Pfg Nmr ◽

1H Nmr Relaxometry

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Spatial correlations in dispersion processes of fluid transport through porous materials by 2-D PFG-NMR

Magnetic Resonance Imaging ◽

10.1016/s0730-725x(01)00356-3 ◽

2001 ◽

Vol 19 (3-4) ◽

pp. 585-586

Author(s):

S. Stapf ◽

K.J. Packer ◽

S. Békri ◽

P.M. Adler

Keyword(s):

Porous Materials ◽

Fluid Transport ◽

Spatial Correlations ◽

Pfg Nmr

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Pfg NMR studies of lateral diffusion in oriented lipid bilayers

Spectroscopy An International Journal ◽

10.1155/2005/753418 ◽

2005 ◽

Vol 19 (4) ◽

pp. 191-198 ◽

Cited By ~ 9

Author(s):

Greger Orädd ◽

Göran Lindblom

Keyword(s):

Lipid Bilayers ◽

Lateral Diffusion ◽

Short Review ◽

Lipid Domains ◽

Nmr Studies ◽

Membrane Biology ◽

Diffusion Technique ◽

Nmr Diffusion ◽

Pfg Nmr

The pfg-NMR diffusion technique is proposed to have an appreciable potential for future biophysical investigations in the field of membrane biology. Topics like transport of molecules both across and in the plane of the membrane can be successfully studied, as well as the formation of lipid domains and their intrinsic dynamics can be scrutinized. This short review will introduce the fundamental aspects of orientation dependent NMR interactions and the technique of macroscopically oriented bilayers for eliminating the unwanted effects of those interactions. The pfg-NMR technique will be briefly introduced and finally, some recent results illustrating the potential of the method are presented.

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NMR-Relaxation and PFG NMR Studies of Water Dynamics in Oriented Collagen Fibres with Different Degree of Cross-linking

Current Tissue Engineering ◽

10.2174/2211542003666140626211652 ◽

2014 ◽

Vol 3 (1) ◽

pp. 47-61 ◽

Cited By ~ 9

Author(s):

Victor Rodin ◽

Victor Nikerov

Keyword(s):

Nmr Relaxation ◽

Water Dynamics ◽

Cross Linking ◽

Collagen Fibres ◽

Nmr Studies ◽

Pfg Nmr

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NMR Studies of Fluid Diffusion in Confining Geometries

MRS Proceedings ◽

10.1557/proc-290-161 ◽

1992 ◽

Vol 290 ◽

Author(s):

Michael Jerosch-Herold ◽

Hans Thomann ◽

A. H. Thompson

Keyword(s):

Internal Field ◽

Restricted Diffusion ◽

Length Scale ◽

Nmr Studies ◽

Longitudinal Magnetization ◽

Complementary Method ◽

Field Gradients ◽

Diffusion Dynamics ◽

Pfg Nmr ◽

Fluid Diffusion

AbstractDiffusion dynamics for fluids in sandstone rocks were studied by CPMG and pulsed field gradient (PFG) NMR measurements. Stretched exponential decays of the transverse magnetization were observed while varying the interpulse spacing, τ, in the CPMG experiment which sets the time for diffusion. A crossover from free to restricted diffusion is evident in the dependence of both T2 and the stretch exponent, β2, on the diffusion time τ. The T2(τ) data is fit to a model which interpolates between free and restricted diffusion and has only one free adjustable length scale despite the fact that the sandstone rocks are characterized by a pore size distribution. This NMR derived length scale correlates with a characteristic length derived from Hg injection experiments at the percolation threshold. We compare these results from the CPMG experiment with stimulated echo PFG-NMR diffusion measurements. This provides a complementary method of probing the diffusion dynamics since the longitudinal magnetization is insensitive to the dephasing effects of diffusion in internal field gradients.

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