ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Porous Vycor Brand Glass has been investigated by solvent permeability, multilayer adsorption (BET method) and electron microscopy. A simple relationship has been found between KUHN's solvent permeability G and the reciprocal product of solvent viscosity and effective molecule volume in the gaseous state. The highest permeabilities a t comparable molecule radii were exhibited by the n-alkanes, the lowest by alcohols and water. The activation energies of DARCY's constant KD = G · η were ranging between -0.30 kcal/mole (water) and + 1.07 kcal/mole (benzene). An optimal limit for solute permeation is derived by solvent permeabilities, giving pore radii between 4.5 and 6 Å. These values are in good agreement with those from diffuse flow (5.5 Å) and electron microscopy (8.5 Å).
Zusätzliches Material:
7 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19640470613
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