Patent ID: 6766257
Filing Date: 2004-07-20
Classification: B01D,G01N

Abstract:
A method of determining the pore structure of the individual layers in a multi-layered composite porous material, comprising the steps of:a) providing a sample of a multi-layered porous material; b) seal said sample in suitable test chamber; c) filling pores of said sample with a wetting liquid, such that a liquid/sample surface free energy is less than a gas/sample surface free energy; d) using a non-reacting gas to apply pressure to one side of said sample sealed in said test chamber; e) increasing said gas pressure gradually, so as to displace said liquid from said pores, and increase gas flow through said sample; f) measuring said pressure at which liquid flows from each successive layer of said test material; and g) calculating pore structure using an equation selected from the group consisting of: i) p=&ggr;(dS/dV); ii) D=4 &ggr;/p; and iii) f=âˆ’d[100(Fw/Fd)]/d D.