Determination of Li+Self-Diffusion Coefficients in an Aqueous Suspension of Sulfonated Polystyrene Latex by Pulsed-Field-Gradient, Spin-Echo NMR

1998 ◽  
Vol 102 (40) ◽  
pp. 7735-7739 ◽  
Author(s):  
James M. Roberts ◽  
Hanna Sierzputowska-Gracz ◽  
E. O. Stejskal ◽  
Janet G. Osteryoung
Keyword(s):  
Field Gradient ◽  
Diffusion Coefficients ◽  
Spin Echo ◽  
Aqueous Suspension ◽  
Polystyrene Latex ◽  
Sulfonated Polystyrene ◽  
Pulsed Field ◽  
Self Diffusion

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

Determination of Molecular Self-Diffusion Coefficients Using Pulsed-Field-Gradient NMR: An Experiment for Undergraduate Physical Chemistry Laboratory

2012 ◽  
Vol 89 (6) ◽  
pp. 780-783 ◽  
Author(s):  
Jennifer Harmon ◽  
Cierra Coffman ◽  
Spring Villarrial ◽  
Steven Chabolla ◽  
Kurt A. Heisel ◽  
...  
Keyword(s):  
Physical Chemistry ◽  
Field Gradient ◽  
Diffusion Coefficients ◽  
Chemistry Laboratory ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion

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.

NMR Pulsed Field Gradient Study of Self-Diffusion in the Isotropic Phase of the Liquid Crystals MBBA and EBBA

1979 ◽  
Vol 34 (8) ◽  
pp. 964-968 ◽  
Author(s):  
G. Rollmann ◽  
K. F. Reinhart ◽  
F. Noack
Keyword(s):  
Liquid Crystals ◽  
Field Gradient ◽  
Diffusion Coefficients ◽  
Isotropic Phase ◽  
Experimental Accuracy ◽  
Pulsed Field ◽  
Relaxation Analysis ◽  
Self Diffusion ◽  
Gradient Technique ◽  
First Time

AbstractIn refinement of a previous study made by Hayward and Packer, the self-diffusion coefficients D of the nematogen liquid crystals MBBA and EBBA were remeasured in the isotropic phase by means of the NMR pulsed field gradient technique. In particular, the diffusion measurements were made for the first time at different Larmor frequencies. A comparison with results obtained recently on the same samples by NMR T1 relaxation analysis reveals a severe discrepancy. Since the gradient method gives results in essential agreement with optical spectroscopies, the observed discrepancy must be attributed to shortages of the relaxation analysis (incorrect models, insufficient experimental accuracy). It is also shown that D depends more strongly on the molecular weight m than m-1/2 .

scholarly journals The association of dimethylsulfoxide and model membranes studied by pulse-field gradient NMR

2004 ◽  
Vol 18 (2) ◽  
pp. 265-269 ◽  
Author(s):  
Anthony Kennedy ◽  
Carla J. Long ◽  
Peter J. Hmel ◽  
Rickey Hicks ◽  
Thomas J. Reid
Keyword(s):  
Field Gradient ◽  
Mole Fraction ◽  
Diffusion Coefficients ◽  
Pulse Field ◽  
Cellular Injury ◽  
Pulse Field Gradient ◽  
Spectra Analysis ◽  
Self Diffusion ◽  
Dppc Vesicle

The use of dimethylsulfoxide (DMSO) as a cryoprotectant to reduce cellular injury during freezing is well known, however the intermolecular interactions between this amphiphilic molecule and biological membranes that form the basis of this protection are unknown. DMSO–dipalmitoylphosphatidylcholine (DPPC) vesicle interactions were investigated in pulsed-field gradient NMR (PFGNMR) experiments and spectra analysis allowed for the determination of self-diffusion coefficients for each species present. The mole fraction of DMSO associated with the DPPC vesicles was then calculated from the diffusion coefficients: the mole fraction increased from 14% to 42% as the membrane was heated from below to above the main phase transition temperature.

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