Self-diffusion of fluid confined in cylindrical nanotubes of different diameters

2011 ◽  
Author(s):  
Reena Devi ◽  
Sunita Srivastava ◽  
K. Tankeshwar ◽  
S. K. Tripathi ◽  
Keya Dharamvir ◽  
...  
Keyword(s):  
Self Diffusion ◽  
Cylindrical Nanotubes ◽  
Different Diameters

scholarly journals Influence of Pore Size on Carbon Dioxide Diffusion in Two Isoreticular Metal–Organic Frameworks

2020 ◽  
Author(s):  
Alexander C. Forse ◽  
Kristen A. Colwell ◽  
Miguel I. Gonzalez ◽  
Stefan Benders ◽  
Rodolfo M. Torres-Gavosto ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Porous Materials ◽  
Pore Size ◽  
Critical Role ◽  
Metal Organic Frameworks ◽  
The Self ◽  
Self Diffusion ◽  
Common Strategy ◽  
Metal Organic ◽  
Different Diameters

The rapid diffusion of molecules in porous materials is critical for numerous applications including separations, energy storage, sensing, and catalysis. A common strategy for tuning guest diffusion rates is to vary the material pore size, although detailed studies that isolate the effect of changing this particular variable are lacking. Here, we begin to address this challenge by measuring the diffusion of carbon dioxide in two isoreticular metal–organic frameworks featuring channels with different diameters, Zn<sub>2</sub>(dobdc) (dobdc<sup>4–</sup> = 2,5-dioxidobenzene-1,4-dicarboxylate) and Zn<sub>2</sub>(dobpdc) (dobpdc<sup>4−</sup> = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate), using pulsed field gradient NMR spectroscopy. An increase in the pore diameter from 15 Å in Zn<sub>2</sub>(dobdc) to 22 Å in Zn<sub>2</sub>(dobpdc) is accompanied by an increase in the self-diffusion of CO<sub>2</sub> by a factor of 4 to 6, depending on the gas pressure. Analysis of the diffusion anisotropy in Zn<sub>2</sub>(dobdc) reveals that the self-diffusion coefficient for motion of CO<sub>2</sub> along the framework channels is at least 10,000 times greater than for motion between the framework channels. Our findings should aid the design of improved porous materials for a range of applications where diffusion plays a critical role in determining performance.

scholarly journals Influence of Pore Size on Carbon Dioxide Diffusion in Two Isoreticular Metal–Organic Frameworks

2020 ◽  
Author(s):  
Alexander C. Forse ◽  
Kristen A. Colwell ◽  
Miguel I. Gonzalez ◽  
Stefan Benders ◽  
Rodolfo M. Torres-Gavosto ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Porous Materials ◽  
Pore Size ◽  
Critical Role ◽  
Metal Organic Frameworks ◽  
The Self ◽  
Self Diffusion ◽  
Common Strategy ◽  
Metal Organic ◽  
Different Diameters

The rapid diffusion of molecules in porous materials is critical for numerous applications including separations, energy storage, sensing, and catalysis. A common strategy for tuning guest diffusion rates is to vary the material pore size, although detailed studies that isolate the effect of changing this particular variable are lacking. Here, we begin to address this challenge by measuring the diffusion of carbon dioxide in two isoreticular metal–organic frameworks featuring channels with different diameters, Zn<sub>2</sub>(dobdc) (dobdc<sup>4–</sup> = 2,5-dioxidobenzene-1,4-dicarboxylate) and Zn<sub>2</sub>(dobpdc) (dobpdc<sup>4−</sup> = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate), using pulsed field gradient NMR spectroscopy. An increase in the pore diameter from 15 Å in Zn<sub>2</sub>(dobdc) to 22 Å in Zn<sub>2</sub>(dobpdc) is accompanied by an increase in the self-diffusion of CO<sub>2</sub> by a factor of 4 to 6, depending on the gas pressure. Analysis of the diffusion anisotropy in Zn<sub>2</sub>(dobdc) reveals that the self-diffusion coefficient for motion of CO<sub>2</sub> along the framework channels is at least 10,000 times greater than for motion between the framework channels. Our findings should aid the design of improved porous materials for a range of applications where diffusion plays a critical role in determining performance.

scholarly journals Influence of Pore Size on Carbon Dioxide Diffusion in Two Isoreticular Metal–Organic Frameworks

2020 ◽  
Author(s):  
Alexander C. Forse ◽  
Kristen A. Colwell ◽  
Miguel I. Gonzalez ◽  
Stefan Benders ◽  
Rodolfo M. Torres-Gavosto ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Porous Materials ◽  
Pore Size ◽  
Critical Role ◽  
Metal Organic Frameworks ◽  
The Self ◽  
Self Diffusion ◽  
Common Strategy ◽  
Metal Organic ◽  
Different Diameters

The rapid diffusion of molecules in porous materials is critical for numerous applications including separations, energy storage, sensing, and catalysis. A common strategy for tuning guest diffusion rates is to vary the material pore size, although detailed studies that isolate the effect of changing this particular variable are lacking. Here, we begin to address this challenge by measuring the diffusion of carbon dioxide in two isoreticular metal–organic frameworks featuring channels with different diameters, Zn<sub>2</sub>(dobdc) (dobdc<sup>4–</sup> = 2,5-dioxidobenzene-1,4-dicarboxylate) and Zn<sub>2</sub>(dobpdc) (dobpdc<sup>4−</sup> = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate), using pulsed field gradient NMR spectroscopy. An increase in the pore diameter from 15 Å in Zn<sub>2</sub>(dobdc) to 22 Å in Zn<sub>2</sub>(dobpdc) is accompanied by an increase in the self-diffusion of CO<sub>2</sub> by a factor of 4 to 6, depending on the gas pressure. Analysis of the diffusion anisotropy in Zn<sub>2</sub>(dobdc) reveals that the self-diffusion coefficient for motion of CO<sub>2</sub> along the framework channels is at least 10,000 times greater than for motion between the framework channels. Our findings should aid the design of improved porous materials for a range of applications where diffusion plays a critical role in determining performance.

Structural Organization and Distribution of Fiber Types in Extraocular Muscles of Cats

1972 ◽  
Vol 30 ◽  
pp. 34-35
Author(s):  
Asish C. Nag ◽  
Lee D. Peachey
Keyword(s):  
Fiber Type ◽  
Light And Electron Microscopy ◽  
Small Diameter ◽  
Extraocular Muscles ◽  
Fiber Types ◽  
Distinctive Features ◽  
Superior Rectus ◽  
Adult Cats ◽  
Different Diameters ◽  
Orbital Region

Cat extraocular muscles consist of two regions: orbital, and global. The orbital region contains predominantly small diameter fibers, while the global region contains a variety of fibers of different diameters. The differences in ultrastructural features among these muscle fibers indicate that the extraocular muscles of cats contain at least five structurally distinguishable types of fibers.Superior rectus muscles were studied by light and electron microscopy, mapping the distribution of each fiber type with its distinctive features. A mixture of 4% paraformaldehyde and 4% glutaraldehyde was perfused through the carotid arteries of anesthetized adult cats and applied locally to exposed superior rectus muscles during the perfusion.

Self-diffusion study of bile salt-monoolein micelles determination of the intermicellar bile salt concentration

1983 ◽  
Vol 80 ◽  
pp. 315-323 ◽  
Author(s):  
Marc Lindheimer ◽  
Jean-Claude Montet ◽  
Roselyne Bontemps ◽  
Jacques Rouviere ◽  
Bernard Brun
Keyword(s):  
Bile Salt ◽  
Salt Concentration ◽  
Diffusion Study ◽  
Bile Salt Concentration ◽  
Self Diffusion

DEFECTS AFTER NEUTRON CAFTURE AND INTRINSIC FLUORINE SELF-DIFFUSION IN CaF2

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-538-C7-539
Author(s):  
M. GRUPP ◽  
H. ACKERMANN ◽  
D. DUBBERS ◽  
H. GRUPP ◽  
P. HEITJANS ◽  
...  
Keyword(s):  
Self Diffusion

SURFACE SELF-DIFFUSION OF ERBIUM

1986 ◽  
Vol 47 (C2) ◽  
pp. C2-337-C2-340 ◽  
Author(s):  
G. KOZLOWSKI ◽  
A. CISZEWSKI ◽  
W. SWIECH
Keyword(s):  
Self Diffusion
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