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Title: A simple approach to estimate gas permeability and selectivity of extremely thin and brittle materials
Authors: Chung, T.-S. 
Swee Phin Loh, E.
Shieh, J.-J. 
Keywords: Brittle materials
Gas separation
Multilayer composite membrane
Issue Date: Mar-2000
Citation: Chung, T.-S., Swee Phin Loh, E., Shieh, J.-J. (2000-03). A simple approach to estimate gas permeability and selectivity of extremely thin and brittle materials. Chemical Engineering Science 55 (6) : 1093-1099. ScholarBank@NUS Repository.
Abstract: We have determined that the permeability and selectivity of ultrathin poly (4-vinyl pyridine) (PVP) material using the basic concept of microporous composite hollow fibers, pre-wetting technology and the resistance model. The calculated O2 and N2 permeabilities of an ultrathin PVP layer (~ 400 Å) at room temperature are about 0.40 and 0.049 Barrers, respectively, and the O2/N2 selectivity is approximately 8.3. To measure the permeability and selectivity of ultrathin brittle materials, two types of composite membranes have to be prepared; one is the silicone rubber/substrate membrane and the other is the silicone rubber/brittle material/substrate membrane prepared by the pre-wetting method. The substrate is preferred to be highly permeable with minimum surface defects. The pre-wetting agent is to prevent pore intrusion by sealing surface pores of the substrate before depositing the brittle material on the top of the substrate. Mathematically, the pre-wetting simplifies the resistance model to calculate the permeance of the ultrathin brittle material.
Source Title: Chemical Engineering Science
ISSN: 00092509
DOI: 10.1016/S0009-2509(99)00378-4
Appears in Collections:Staff Publications

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