Self-Diffusion of Hydrophilic Poly(propyleneimine) Dendrimers in Poly(vinyl alcohol) Solutions and Gels by Pulsed Field Gradient NMR Spectroscopy

2003 ◽  
Vol 36 (3) ◽  
pp. 839-847 ◽  
Author(s):  
W. E. Baille ◽  
C. Malveau ◽  
X. X. Zhu ◽  
Y. H. Kim ◽  
W. T. Ford
Keyword(s):  
Nmr Spectroscopy ◽  
Field Gradient ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion

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.

Study of Self-Diffusion of Silicone MQ Resins in Chloroform Solutions by Pulsed Field-Gradient NMR Spectroscopy

2014 ◽  
Vol 45 (4) ◽  
pp. 315-328 ◽  
Author(s):  
Sergey G. Vasil’ev ◽  
Vitaly I. Volkov ◽  
Elena A. Tatarinova ◽  
Aziz M. Muzafarov
Keyword(s):  
Nmr Spectroscopy ◽  
Field Gradient ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Self Diffusion

Controlling Gas Selectivity in Molecular Porous Liquids by Tuning the Cage Window Size

2019 ◽  
Author(s):  
Benjamin Egleston ◽  
Konstantin V. Luzyanin ◽  
Michael C. Brand ◽  
Rob Clowes ◽  
Michael E. Briggs ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Synthesis ◽  
Field Gradient ◽  
Window Size ◽  
Standard Approach ◽  
Porous Solids ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Cage Molecules ◽  
Gas Selectivity

Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe-selective to CH<sub>4</sub>-selective, which is understood using <sup>129</sup>Xe, <sup>1</sup>H, and pulsed-field gradient NMR spectroscopy.

Controlling Gas Selectivity in Molecular Porous Liquids by Tuning the Cage Window Size

2019 ◽  
Author(s):  
Benjamin Egleston ◽  
Konstantin V. Luzyanin ◽  
Michael C. Brand ◽  
Rob Clowes ◽  
Michael E. Briggs ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Synthesis ◽  
Field Gradient ◽  
Window Size ◽  
Standard Approach ◽  
Porous Solids ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Cage Molecules ◽  
Gas Selectivity

Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe-selective to CH<sub>4</sub>-selective, which is understood using <sup>129</sup>Xe, <sup>1</sup>H, and pulsed-field gradient NMR spectroscopy.

Probing Ionic Association on Metal Oxide Clusters by Pulsed Field Gradient NMR Spectroscopy: The Example of Sn12–Oxo Clusters

2004 ◽  
Vol 10 (7) ◽  
pp. 1747-1751 ◽  
Author(s):  
François Ribot ◽  
Virginie Escax ◽  
José C. Martins ◽  
Monique Biesemans ◽  
Laurent Ghys ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Metal Oxide ◽  
Field Gradient ◽  
Ionic Association ◽  
Pulsed Field Gradient Nmr ◽  
Pulsed Field ◽  
Metal Oxide Clusters
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