Pressure decay method is one of the standard experimental techniques for characterization of membranes and membrane materials in terms of sorption, diffusivity, or permeance; this method has a rather high sensitivity (Ferrari et al. 2010; Mulder 1996). The principle of this method is based on estimation of amount of molecules sorbed or permeated through the membrane by monitoring of pressure decay in a chamber with a constant known volume, where the membrane is placed. The amount of gas or vapor sorbed by membrane material at a given pressure is determined by the difference between initial and actual pressures; for sorption experiments, the actual pressure is equilibrium one. Mass flow through the membrane is determined by monitoring of pressure decay in a chamber above the membrane with a constant volume (upstream side) in time. This technique is more commonly used for measurement of gas transport due to higher values of compression coefficients, and the schematic view of this...
References
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Volkov, A. (2013). Pressure Decay Method. In: Drioli, E., Giorno, L. (eds) Encyclopedia of Membranes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40872-4_1405-1
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DOI: https://doi.org/10.1007/978-3-642-40872-4_1405-1
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