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Organic thin film, permeation

Thin-film permeation-barrier technology for flexible organic light-emitting devices J.S. Lewis, M.S. Weaver IEEE Journal of Selected Topics in Quantum Electronics, 10 45-57... [Pg.299]

The wide variability of absorption and diffusional properties of chemical species in organic polymer films makes them useful as selective or complete permeation barriers (e.g., gas separation membranes and passivating layers [1,5,82]) and selective chemical sensor coatings [83]. For these applications, a method for rapidly and directly evaluating the solubility and diffusional properties in thin films is useful. Diffusional properties can be evaluated by monitoring the transient up-... [Pg.167]

Membranes can be classified as porous and nonporous based on the structure or as flat sheet and hollow fiber based on the geometry. Membranes used in pervaporation and gas permeation are typically hydrophobic, nonporous silicone (polydimethylsiloxane or PDMS) membranes. Organic compounds in water dissolve into the membrane and get extracted, while the aqueous matrix passes unextracted. The use of mircoporous membrane (made of polypropylene, cellulose, or Teflon) in pervaporation has also been reported, but this membrane allows the passage of large quantities of water. Usually, water has to be removed before it enters the analytical instrument, except when it is used as a chemical ionization reagent gas in MS [50], It has been reported that permeation is faster across a composite membrane, which has a thin (e.g., 1 pm) siloxane film deposited on a layer of microporous polypropylene [61],... [Pg.215]

Organic membrane reactions are best carried out in reactors made of inorganic membranes, such as from palladium, alumina, or ceramics. A recent trend has been to develop polymeric-inorganic composite-type membranes formed by the deposition of a thin dense polymeric film on an inorganic support. Another class of membranes under development for organic synthesis is the liquid membrane. The permselective barrier in this type of membrane is a liquid phase, often containing a dissolved carrier or transporter which selectively reacts with a specific permeate to enhance its transport rate through the membrane. [Pg.78]


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