Some properties of a new type of membrane, a graded highly asymmetrical skinned micropo-
rous membrane, are discribed and some of their rationale reviewed. The asymmetry of the …

Asymmetric, ie skinned, membranes are structured at chemical and physical levels. The
influence of various structural features on both processing and end use characteristics are …

The unique three dimensional structure of Celgard® 2500 film has been shown by direct
enhanced contrast transmission electron microscopy (TEM) of thin sections from the bulk …

Semi-permeablemembranes of gradedporosity were prepared by subjecting a
homogeneous polyvinylbutyral film to hydrolysis in 4 N sulfuricacid at 60 for varying lengths …

Results We reinvestigated the phenomenon observed by Ruth and his co-workers (1933a,
1935a, b, 1946) using an Amicon 402 ultrafiltration cell with 450 cm3 capacity, which can …

Recent developments in artificial kidney devices make possible repetitive extracorporeal
hemodialysis. These advances not only make possible sustension of life for chronic kidney …

Artificial membranes usually have a gel structure as their basis. Those most extensively,
employed have been prepared from collodion, suitable films being produced by two …

The rate of water permeation through a microporous membrane is affected markedly by
adsorption of hydrocarbon impurities and/or trace amounts of organic ions such as H (CH 2 …

New synthetic anionic membranes have been developed as replacements for the cellulose
membranes currently used to remove blood toxins and water in hemodialyzers. The …

That the pore characteristics of membranes govern their filtrative behavior seems rather
axiomatic. Yet, the view that filtration is solely a sieve-type phenomenon is known to be …