Modified Pulsed-Field Gradient NMR Experiments for Improved Selectivity in the Measurement of Diffusion Coefficients in Complex Mixtures:  Application to the Analysis of the Suwannee River Fulvic Acid

1997 ◽  
Vol 69 (11) ◽  
pp. 2122-2128 ◽  
Author(s):  
Ann M. Dixon ◽  
Cynthia K. Larive
Keyword(s):  
Fulvic Acid ◽  
Field Gradient ◽  
Diffusion Coefficients ◽  
Complex Mixtures ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Suwannee River ◽  
Suwannee River Fulvic Acid

c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions

1994 ◽  
Vol 49 (3-4) ◽  
pp. 258-264 ◽  
Author(s):  
D. Girlich ◽  
H.-D. Lüdemann ◽  
C. Buttersack ◽  
K. Buchholz
Keyword(s):  
Field Gradient ◽  
Concentration Dependence ◽  
Diffusion Coefficients ◽  
The Self ◽  
Water Molecules ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion ◽  
Sucrose Solutions ◽  
Wide Range

The self diffusion coefficients D of the water molecules and of sucrose have been determined by the pulsed field gradient NMR technique over a wide range of temperatures and concentrations (cmax: 70% w/w suc.). All temperature dependencies can be fitted to a Vogel- Tammann-Fulcher equation. The isothermic concentration dependence of D for the sucrose is given by a simple exponential concentration dependence

Diffusion of molecular probes and the effects of their interactions with polymer matrices as studied by pulsed-field gradient NMR spectroscopy

2008 ◽  
Vol 86 (6) ◽  
pp. 579-585 ◽  
Author(s):  
Héloise Thérien-Aubin ◽  
Wilms E Baille ◽  
X X Zhu
Keyword(s):  
Nmr Spectroscopy ◽  
Carboxylic Acid ◽  
Field Gradient ◽  
Diffusion Coefficients ◽  
Molecular Probes ◽  
Poly Vinyl Alcohol ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion ◽  
Carboxylic Acid Groups

Pulsed-field gradient NMR spectroscopy was used to study the interactions between small molecular probes and polymers bearing interacting groups. The self-diffusion coefficients of ethylene glycol and its oligomers and their methyl ester derivatives in poly(vinyl alcohol) gels were measured to study the effect of hydrogen bonding. The self-diffusion coefficients of small molecular probes containing hydroxyl, amine, and carboxylic acid groups were determined in several polymer matrices including poly(vinyl alcohol), poly(allylamine), and poly(acrylic acid) bearing lateral hydroxyl, amine, and carboxylic acid groups, respectively. The ionic interactions between the functional groups of the diffusants and of the polymers exhibited a marked effect on the diffusion of the molecular probes. For example, the reduced self-diffusion coefficients measured for a diffusant with a carboxylic acid group in a poly(allylamine) matrix were shown to be lower even though the molecular masses of the diffusants are similar.Key words: pulsed-field gradient NMR spectroscopy, self-diffusion, intermolecular interactions.

Determination of ionic self-diffusion coefficients of lithium electrolytes using the pulsed field gradient NMR

1999 ◽  
Vol 81-82 ◽  
pp. 772-776 ◽  
Author(s):  
Yuria Saito ◽  
Hitoshi Yamamoto ◽  
Osamu Nakamura ◽  
Hiroyuki Kageyama ◽  
Hiroshi Ishikawa ◽  
...  
Keyword(s):  
Field Gradient ◽  
Diffusion Coefficients ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion
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