Series integration of the diaphragm cell transport equation when the diffusion coefficient is a function of concentration

1992 ◽  
Vol 97 (6) ◽  
pp. 4368-4371 ◽  
Author(s):  
Judith B. Cain ◽  
James K. Baird
Keyword(s):  
Diffusion Coefficient ◽  
Transport Equation ◽  
Cell Transport ◽  
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.

scholarly journals Preparation of Tannin Based Hydrogel for Biological Application

2011 ◽  
Vol 8 (4) ◽  
pp. 1638-1643 ◽  
Author(s):  
R. Jameel Mhessn ◽  
L. Abd-Alredha ◽  
R. Al-Rubaie ◽  
A. Fuad Khudair Aziz
Keyword(s):  
Diffusion Coefficient ◽  
Phenolic Compounds ◽  
Wound Dressing ◽  
Synthetic Polymers ◽  
Natural Polymer ◽  
Biological Application ◽  
Artificial Membrane ◽  
Polymeric Blends ◽  
Natural Phenolic Compounds ◽  
Diaphragm Cell

Polymeric blends as potential wound dressing were prepared. Natural polymer (Tannin) and synthetic polymers (PVA and PEG) were used to prepare heterogeneous blends. The product was identified by spectrophotometry. A diaphragm cell was used to measure the diffusion coefficient (D). The result shown the PEG-PVA disk was very faster permeability for all solution. The D of PVA/ PEG-Tannin blend was 0.184x10-3cm2/s higher than Tannin-PEG blend was 0.038x10-3cm2/s. The natural phenolic compounds that can be used artificial membrane to inhibit growth or kill microorganism such as bacteria or fungi.

Measurement of diffusion coefficient using a diaphragm cell: PbBr2AgBr system

1996 ◽  
Vol 167 (1-2) ◽  
pp. 107-110 ◽  
Author(s):  
N.B. Singh ◽  
M.E. Glicksman ◽  
S.R. Coriell ◽  
W.M.B. Duval ◽  
G.J. Santoro ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Diaphragm Cell

Diffusion coefficient determination using a filter-paper diaphragm cell technique

1981 ◽  
Vol 33 (1) ◽  
pp. 121-123 ◽  
Author(s):  
A. David Cadman ◽  
Robert Fleming ◽  
Richard H. Guy
Keyword(s):  
Diffusion Coefficient ◽  
Filter Paper ◽  
Diaphragm Cell
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