Studies on Microcapsules. III. Permeability of Polyurethane Microcapsule Membranes
نویسندگان
چکیده
منابع مشابه
Studies on Permeability of Membranes
A STUDY OF THE BEHAVIOR OF THE DRIED COLLODION MEMBRANE TOWARD THE BIVALENT CALCIUM ION SHOWED THAT: 1. There is almost no potential difference established across a membrane separating two calcium chloride solutions of 0.1 and 0.01 N concentrations. 2. The transfer numbers of chlorine and calcium, as measured in electrical transfer experiments, are both close to 0.5. 3. A sample of membrane in ...
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The transfer number of Cl in a KCl solution within the pores of a dried collodion membrane is always lower than 0.5. It depends on the concentration of the solution and decreases in general with decreasing concentration. However, the transfer number for any given KCl concentration has the significance of a definite and constant figure only when an infinitely small amount of coulombs is allowed ...
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Mixed matrix membranes (MMMs) are attracting significant interest for pervaporation and gas separation applications. To better comprehend the impact of filler particles within polymer matrices, the species permeation mass transport was theoretically studied by numerical simulation using finite differences. The Fick’s second law of diffusion was solved for a three-dimensional MMM to obtain the c...
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I t has been shown (1) that the l,.m of a concentration chain, e . g . with two KCI solutions in the ratio 10:1, across a membrane of dried collodion, reaches its maximum value better the more dilute the KC1 solutions are, and that in higher ranges of concentrations, the effect of the membrane vanishes more and more. So in the latter case the P.W. approaches closely that established without a m...
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Multilayer microcapsules showing unique charge-controlled permeability have been successfully fabricated by employing poly(styrene sulfonate) (PSS)-doped CaCO3 particles as templates. Encapsulation of the PSS molecules is thus achieved after core removal. Scanning force microscopy (SFM), UV-vis, Raman spectroscopy, and zeta-potential confirm the existence of the PSS molecules in the CaCO3 parti...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1969
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.17.1073