Diaphragm cell measurement of liquid cd - in diffusion coefficients at 300°

1970 ◽  
Vol 1 (8) ◽  
pp. 2336-2337
Author(s):  
R. H. Kaiser ◽  
F. O. Shuck
Keyword(s):  
Diffusion Coefficients ◽  
Cell Measurement ◽  
Diaphragm Cell

Diffusion measurements in aqueous L-ascorbic acid solutions

1980 ◽  
Vol 33 (8) ◽  
pp. 1857 ◽  
Author(s):  
M Shamim ◽  
SMA Baki
Keyword(s):  
Ascorbic Acid ◽  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Molecular Form ◽  
Acid Solutions ◽  
Acid Molecule ◽  
Diaphragm Cell ◽  
Solvent Molecules

Diffusion coefficients in aqueous 0.05-1.0 M L-ascorbic acid solutions have been measured at 298.15 K by using a modified version of the Stokes diaphragm cell. The diffusion coefficient of un-ionized ascorbic acid molecule at zero concentration has been found to be 1.055 × 10-9 m2 s-1. The diffusion coefficient of an isolated ascorbate ion, C6H7O6-, is about 23 % lower than the molecular form; this indicates, as expected, that ions strongly interact with solvent molecules.

Equations for determining Diffusion Coefficients in Liquid Systems by the Diaphragm Cell Technique

Nature ◽  
1960 ◽  
Vol 187 (4739) ◽  
pp. 767-768 ◽  
Author(s):  
F. A. L. DULLIEN ◽  
L. W. SHEMILT
Keyword(s):  
Diffusion Coefficients ◽  
Liquid Systems ◽  
Diaphragm Cell

Tracer diffusion coefficients of tritiated water and acetonitrile in water + acetonitrile mixtures

1980 ◽  
Vol 33 (8) ◽  
pp. 1667 ◽  
Author(s):  
AJ Easteal
Keyword(s):  
Diffusion Coefficients ◽  
Structural Model ◽  
Tritiated Water ◽  
Tracer Diffusion ◽  
Solution Viscosity ◽  
Composition Region ◽  
Self Diffusion ◽  
Composition Variation ◽  
Diaphragm Cell ◽  
Tracer Diffusion Coefficients

Tracer diffusion coefficients of tritiated water (HTO) and 14C-labelled acetonitrile have been measured at 298.15 K by the diaphragm cell method, for the whole range of compositions of water+ acetonitrile binary mixtures. The composition variation of (a) the deviation of D from additivity and (b) the product Dη, for each component, has been evaluated. The variation of Dη is discussed in terms of the Naberukhin- Rogov structural model for solutions of non-electrolytes in water. ��� The diffusion data have been used to test a semiempirical relationship, between solution viscosity and self-diffusion coefficients, due to Albright. For the composition region of 5-55 mole % acetonitrile Albright's equation gives calculated viscosities which agree well with observed values. The calculation fails to reproduce the observed variation of viscosity for the composition region of 60-95 mole % acetonitrile.

Tracer diffusion in aqueous sucrose and urea solutions

1990 ◽  
Vol 68 (9) ◽  
pp. 1611-1615 ◽  
Author(s):  
Allan J. Easteal
Keyword(s):  
Diffusion Coefficients ◽  
Relative Viscosity ◽  
Tracer Diffusion ◽  
Proton Exchange ◽  
Specific Viscosity ◽  
Sucrose Solutions ◽  
Diaphragm Cell ◽  
Tracer Diffusion Coefficients ◽  
Viscosity Dependence

Tracer diffusion coefficients for water (as HTO), methanol (14CH3OH), and acetonitrile (CT3CN) in aqueous sucrose (10–25% w/w) and urea (0.25–4 mol L−1) solutions at 298 K have been determined using the diaphragm cell technique. For sucrose solutions tracer diffusion coefficients vary with the 2/3 power of the relative viscosity and the viscosity dependence is the same for the above tracers as for sucrose and oxygen. In urea solutions tracer diffusion coefficients appear to have a solute-specific viscosity dependence, but the solute specificity is largely removed when the effects of proton exchange and urea dimerisation are considered. Keywords: diffusion, water, methanol, acetonitrile, sucrose, urea.

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